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Audi S4
Audi S4
Audi S4
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Audi S4
Audi S4 (B9) sedan (front view, United States)
Overview
ManufacturerAudi AG
Production
  • 1991–1994
    1997–2025
Body and chassis
ClassCompact executive car (D)
LayoutF4 layout
RelatedAudi A4
Audi RS 4

The Audi S4 is the high performance variant of Audi's compact executive car A4. The original Audi S4, built from 1991 until 1994, was a performance-oriented version of Audi's 100 saloon/sedan. All subsequent S4s, beginning with the "B5" platform car in 1997, have been based on the Audi A4; and as the A4 has evolved from one generation to the next, so has the S4. Audi's platform generation names, beginning with "B5" in 1997, are used throughout to distinguish between generations/evolutions of these products.

Like its regular A4 counterpart, all S4 variants have had longitudinally oriented, front-mounted engines. All versions of the S4 have their transmission mounted immediately at the rear of the engine in a longitudinal orientation, in the form of a transaxle, and like all Audi "S" cars, are only available as standard with Audi's quattro all-wheel drive (AWD) system, using a Torsen-based centre differential system.[1] A more powerful internal combustion engine, larger upgraded brakes, firmer suspension, larger wheels, and distinctive sheetmetal, styling cues and badging have always been amongst the many upgrades the S4 receives over its mainstream 100 and A4 siblings. In markets where the even higher-performance and further-visually-differentiated Audi RS 4 is not offered, the S4 is the top-of-the-line trim of the A4 family.[2][3]

A single turbocharged 2.2-litre inline five-cylinder powered the original C4 version, and a 2.7-litre twin turbocharged V6 engine was found in the B5 generation. The B6 and B7 versions shared a common 4.2-litre V8 engine, the first time that a V8 engine was placed in a compact executive car, placing it in direct competition with the BMW M3 (3.2 L inline 6) and Mercedes-Benz C32 AMG (3.2-litre supercharged V6). The B8 generation uses a supercharged 3.0-litre V6 TFSI engine and competed with the BMW 335i, BMW 335i/340i xDrive, and Mercedes-Benz C350.[2] The current B9 generation is powered by a turbocharged 3.0-litre V6 TFSI engine, with rivals including the BMW M340i xDrive and Mercedes-Benz C450 AMG/Mercedes-AMG C43 4MATIC.[4][5]

All versions of the S4 have been manufactured at Audi's plant in Ingolstadt, Germany; they are, or have been available as a four-door five-seat saloon and a five-door five-seat Avant (Audi's name for an estate car/station wagon) body styles since the model's inception in 1991. A two-door four-seat Cabriolet (convertible) S4 variant was introduced as part of the B6 and B7 generation A4 lineups. The B8 Cabriolet has now been built off the A5 coupe body style and the "S" variant is marketed under the Audi S5 nameplate.

C4 (Typ 4A, 1991–1994)

[edit]
First generation (C4/4A)
Overview
Also called"Ur-S4"
ProductionAugust 1991–July 1994[1]
AssemblyGermany: Neckarsulm
Body and chassis
Body style4-door saloon/sedan
5-door estate/wagon (Avant)
PlatformVolkswagen Group C4
RelatedAudi C4 100
Audi C4 A6
Audi C4 S6
Powertrain
Engine
Transmission5-speed manual
6-speed manual
4-speed automatic[1]
Dimensions
Wheelbase2,692 mm (106.0 in)
Length4,790–4,982 mm (188.6–196.1 in)
Width1,803 mm (71.0 in)
Height1,443 mm (56.8 in)
Kerb weightsaloon: 1,730 kg (3,814 lb)
estate: 1,780 kg (3,924 lb)
Chronology
SuccessorAudi C4 S6, Audi B5 S4
See also: Audi S6 § C4

Factory production of the original Audi S4 (Typ 4A), usually known as Audi 100 S4, began in August 1991 to serve as the performance version of the newly updated, C4 platform, 100-series four-door, five-seat saloon. First shown to the public at the May 1991 Barcelona Show, it was designed to replace the outgoing C3-based Audi 200 turbo quattro 20V and retained its five-cylinder engine.[6] The 200, Audi's first true sports-saloon, had been discontinued at the end of 1990.[7][8] Being the first S4 model from Audi, it is commonly referred to as the Ur-S4, derived from the German: Ursprünglich augmentive word (meaning: original).

Audi S4 Avant (C4)

Audi mildly updated the C4-based model line in 1994 and dropped the 100 nomenclature; all variants of the former Audi 100 line were now re-badged as the Audi A6. In line with the switch in model name, Audi temporarily discontinued the use of the S4 name and began selling an updated but fundamentally identical version of the car, based on the "new" A6 and badged as S6. Despite the change in name, differences between the outgoing S4 and incoming S6 were cosmetic and very light.

An all-new C5-based Audi A6 debuted for 1997, after which the S4 and S6 became distinctly separate models based on very different platforms.

The C4 variant S4 ended factory production after less than three years in July 1994.[1]

One of its most renowned owners was Ayrton Senna who owned a silver Avant,[9] not least because he was the Audi distributor for Brazil.

C4 powertrain

[edit]

In standard form, the powertrain detail of the C4-based S4 was available with only one engine, a single turbocharged and intercooled version of Audi's 2.2-litre 20-valve inline five-cylinder engine This displaced 2,226 cc (135.8 cu in) and was equipped with an advanced Bosch Motronic electronic engine control unit (ECU).[1] This engine (parts code prefix: 034, identification code: AAN), developed a motive power output of 169 kW (230 PS; 227 bhp) at 5,900 rpm and 350 N⋅m (258 lbf⋅ft) of torque at 1,950 rpm.[1] With the five-speed manual transmission, it was able to accelerate from 0-100 km/h (62 mph) in 6.2 seconds.

Both five- and six-speed manual transmissions (parts code prefix: 01E, identification codes: five-speed: CBD, CET, six-speed: CBL, CMG) were offered to European customers, but a five-speed manual was the only transmission available in North America; a four-speed automatic transmission (parts code prefix: 01F, identification code: CBF) was available as an option worldwide.[1] Front and rear axle final drive ratio is either 4.111 or 3.889 (dependent on transmission type), and the rear axle (parts code prefix: 017, identification codes: AAT, AET) uses a driver-selectable electro-pneumatic-mechanical switchable diff lock.[1]

Audi's quattro four-wheel-drive system was standard on the C4 S4/S6; a first-generation Torsen-based system which used the "T-1" automatically biasing centre differential (ATB) was used.

S4/S6 models equipped with a 4.2-litre 206 kilowatts (280 PS; 276 bhp) all-aluminium alloy V8 engine (parts code prefix: 077, identification code: ABH) became available to European customers as an option from October 1992, only with the six-speed manual gearbox, in either saloon or Avant body styles.[1]

C4 steering, brakes, wheels & tires

[edit]
C4 S4 interior

All C4 S4s' came equipped as standard with a conventional fixed-assistance rack and pinion power assisted steering (PAS) system. An electronically controlled 'servotronic' system, which varied the level of assistance in accordance with the road speed, was available as an option.[1]

There were two different types of high performance brake systems on offer for the C4 S4.[1] All S4s' initially had 310 mm (12.20 in) diameter by 25 mm (0.984 in) thick, radially ventilated disc brakes up front, each with an ATE single-piston sliding caliper inside a 'UFO' styled bell-shaped disc. With the introduction of the V8 engine, a new front brake setup became standard; again the discs used radial ventilation, but these front discs were now sized at 314 mm (12.36 in) by 30 mm (1.181 in) - with a conventionally mounted Lucas-Girling caliper in an external position over the disc. US models had smaller 276 mm (10.87 in) discs. The rear brakes, 269 mm (10.59 in) by 20 mm (0.787 in) and also radially ventilated - remained the same throughout C4 production; they used a Lucas-Girling single-piston sliding caliper with an integrated cable-actuated handbrake mechanism. A Bosch three-channel operation (four-channel sensing) Anti-lock Braking System (ABS) with a mechanical load sensing valve for the rear brakes was standard throughout production.[1]

For wheel options, the standard five-arm "Fuchs" forged alloy wheels were 8.0Jx16H2 ET40, and were fitted with 225/50 R16 sized tyres. Several other tyre and wheel designs were optionally available: a 7.5Jx15H2 ET40 six-spoke with 215/60 R15 tyres, an 8.0Jx16H2 ET40 five-double-spoke, a 7.5Jx16H2 ET35 six spoke "Avus", and an 8.0Jx17H2 ET40 ten-spoke.[1]

B5 (Typ 8D, 1997–2002)

[edit]
Second generation (B5/8D)
Overview
ProductionOctober 1997–September 2001[1]
AssemblyGermany: Ingolstadt
Body and chassis
Body style4-door saloon/sedan[1]
5-door estate/wagon (Avant)[1]
PlatformVolkswagen Group B5
RelatedAudi B5 A4
Audi B5 RS4
Powertrain
Engine2.7 L V6 30v DOHC 'biturbo'[1]
Transmission6-speed manual,[1]
5-speed ZF 5HP19 tiptronic automatic[1]
Dimensions
Wheelbase2,615 mm (103.0 in)
Length4,483 mm (176.5 in)
Width1997-99: 1,733 mm (68.2 in)
2000-02: 1,848 mm (72.8 in)
Heightsaloon: 1,396 mm (55.0 in)
Avant: 1,418 mm (55.8 in)
Kerb weight1,535 kg (3,384 lb) to
1,680 kg (3,704 lb)
Chronology
PredecessorAudi C4 S4
SuccessorAudi B6 S4
Audi B5 S4 Avant
Audi B5 S4 sedan

The second generation S4 (Type 8D), also known as the Audi S4 quattro debuted in 1997, with factory production commencing October 1997,[1] as part of the facelifted B5 platform Audi A4 line-up, although it was not available in North America until late 1999.

In addition to the saloon (sedan), an estate version (wagon)–the Audi S4 Avant–was introduced into the lineup from 1998. Production of the B5 S4 ceased in September 2001,[1] although it was still sold together with the next B6 platform generation through 2002 in North America. Examples produced June 2001 to end of production are 2002 Model Year cars, the 10th digit of the VIN being the number "2".

B5 powertrain

[edit]

The powertrain details[1] of the B5 S4 feature a 2.7-litre twin-turbo ('biturbo') 90° third-generation V6 engine (parts code prefix: 078, identification codes: AGB, AZB, APB). Details of the powerplant include a cast iron cylinder block with two lightweight aluminium alloy cylinder heads. The valvetrain includes 30 valves (five valves per cylinder),[10][11] twin hybrid-driven (timing belt and roller chain) double overhead camshafts and variable valve timing for the inlet valves. The intake air is pressurized by two parallel water-cooled BorgWarner K03-series turbochargers; the charged air is cooled by two side-mounted air-to-air intercoolers (SMICs). It displaces 2,671 cubic centimetres (163.0 cu in), and is rated to produce a motive power output of 195 kW (265 PS; 261 bhp) at 5,800 rpm, and generates 400 N⋅m (295 lbf⋅ft) of torque at 1,850 rpm. Engine management was by way of a Bosch Motronic ME 7.1 (7.0 in North America) electronic engine control unit (ECU), and helped it meet the European EU-3D emissions standard. In all US-market cars, the engine was detuned to meet US emissions regulations; output was reduced to 184 kW (250 PS; 247 hp) and 350 N⋅m (258 lbf⋅ft) (identification code: APB).

As in the previous S4, a six-speed C90 manual transmission (parts code prefix: 01E, identification code: DSY, gear ratios: 1st: 3.500, 2nd: 1.889, 3rd: 1.231, 4th: 0.967, 5th: 0.806, 6th: 0.684) was standard equipment, as was the Torsen T-2 quattro permanent all-wheel drive system. Final drive (parts code prefix: 01H, identification code: DQA) ratio is 4.111. A five-speed ZF 5HP19 tiptronic automatic transmission (parts code prefix: 01V) became available for the first time as an option.[1]

The B5 S4 claims acceleration from 0 to 100 km/h (0 to 62 mph) in 5.7 seconds, and has an electronically limited top speed of 250 km/h (155 mph), which made it both the quickest saloon/sedan in the Audi model line, and among the quickest saloon/sedans in the world at that time.[citation needed]

B5 suspension, brakes, wheels & tires

[edit]

The B5 S4 is fitted with 4-wheel independent suspension. The front suspension is a multi-link design with four individual control arms per wheel. The rear suspension is an unequal length double wishbone design; the lower control arms are mounted to a subframe which also carries the differential housing. Shock absorbers, coil springs, and anti-roll bars are fitted front and rear.

The B5 S4 brake system[1] consisted of radially ventilated discs, 321 mm (12.64 in) in diameter by 30 mm (1.18 in) thick up front, and 256 mm (10.08 in) by 22 mm (0.87 in) at the rear. Two-piston Lucas HP2 brake calipers at the front (with four pads per caliper), with Lucas single-piston sliding brake calipers at the rear. A Bosch ABS 5.3 four-channel Anti-lock Braking System (with Electronic Brakeforce Distribution (EBD) and Electronic Differential Lock (EDL) - Later 2001.5 cars all came with ESP Electronic Stability Program and upgraded tires. The Avant became available as well in North America.

Standard wheels[1] were Audi's die-cast aluminium alloy six-arm 'Avus' 7.5Jx17H2 ET45 wheels, fitted with 225/45 ZR17 performance tyres.

B5 colors & optional equipment

[edit]
B5 S4 interior

Available exterior colors included; Imola Yellow, Nogaro Blue w/pearl effect. Brilliant Black, Laser Red, Light Silver metallic Cactus Green w/pearl effect, Santorin Blue w/pearl effect, Hibiscus Red w/pearl effect and Casablanca White. The first two colors were exclusive to the S4 model. Solid aluminum mirror housings were standard on later 2001.5+ models. Interior leather was available in Onyx or Silver.

Available options included:

  • Bose premium sound system (came stock in most countries)
  • Audi Navigation System
  • 6-disc CD changer
  • Hands free Motorola cellular telephone
  • Premium Package: Sunroof, HomeLink transmitter, auto dimming mirrors
  • Cold Weather Package: heated front seats, heated outside mirrors, expandable ski sack
  • Sport Package (enhanced interior trim)
Audi S4 interior photo with the Nogaro blue option
Audi S4 Nogaro blue interior option

Silver or blue Alcantara seat inserts with matching armrests in the door cards was a rare option.

The 'Sport Package' also replaced the wood-grain belt line trim with silver aluminum trim, and the wood grain finish around the shifter surround with black plastic. Carbon fiber trim was also available on some models

On the early 2000 models, the Alcantara inserts in the rear seats did not fully extend forward to the front edge of the seat.

B5 motorsport

[edit]

A motor racing version of the car achieved great success in the SpeedVision World Challenge with Michael Galati taking the 2001 SpeedVision GT title in a Champion Racing S4, winning four races, and helping Audi to its first Manufacturers' Championship.

The Audi Sport specification Champion A4 chassis included a B5 RS4 engine, and Alcon racing brake calipers (4 piston front and 2 piston rear calipers).

Don Istook, with Istook's Motorsports, built and campaigned several B5 S4's in first the Motorola Cup, and then the Grand Am Cup. The S4's were even raced by Istook's Motorsports in the Rolex GT category for several races to help fill the field. Of note, one of the S4's, racing against true GT cars, even ran as high as second place (in the rain) at Barber Motorsports Park.[citation needed] These S4's were built using existing S4, not RS4 engines, but used the B5 Audi RS4 K04 turbochargers.

B6 (Typ 8E/8H, 2003–2005)

[edit]
Third generation (B6/8E/8H)
Overview
ProductionMar 2003–Dec 2004
Feb 2004–Dec 2005 (Cabrio)[1]
AssemblyGermany: Ingolstadt (Sedan & Avant)
Germany: Rheine (Karmann: Cabriolet)
Body and chassis
Body style4-door saloon/sedan,[1]
5-door estate/wagon (Avant),[1]
2-door cabriolet[1]
PlatformVolkswagen Group B6 (PL46)
RelatedAudi B6 A4
Powertrain
Engine4.2 L V8 40v DOHC[1]
Transmission6-speed Getrag manual,[1]
6-speed ZF 6HP19 tiptronic automatic[1]
Dimensions
Wheelbase2,651 mm (104.4 in),
Cabrio: 2,654 mm (104.5 in)
Length4,575 mm (180.1 in),
Cabrio: 4,573 mm (180.0 in)
Width1,781 mm (70.1 in),
Cabrio: 1,778 mm (70.0 in)
Height1,415 mm (55.7 in),
Cabrio: 1,391 mm (54.8 in)
Kerb weightsaloon: 1,660 kg (3,660 lb)
estate: 1,720 kg (3,792 lb)
cabriolet: 1,855 kg (4,090 lb)
Chronology
PredecessorAudi B5 S4
SuccessorAudi B7 S4
2003–2005 S4 (B6) saloon (US)
MY2005 Audi S4 (B6) Avant (US)
Audi S4 Cabriolet (UK)

The third generation Audi S4 quattro (Type 8E — saloon: 8E2, Avant: 8E5, and Cabriolet: 8H7) debuted its saloon and Avant bodystyles in Europe in March 2003,[1] and appeared in North America slightly later.[when?] This was based on the latest Volkswagen Group B6 (PL46) platform used by the then current Audi B6 A4. Despite having moved to an entirely new platform, one of the S4's most publicised new features was its new engine - a 4.2-litre V8 engine. Following its initial launch of either a four-door five-seat saloon (sedan), or a five-door five-seat Avant (estate/wagon), it eventually became available in three bodystyles - and for the first time in the Audi 'S' car range, from February 2004, a two-door four-seat Cabriolet (convertible), Type 8H, was included in the model range.[12]

Official performance figures for 0-100 km/h (62 mph) in the saloon with the manual transmission are 5.6 seconds (Avant 5.8 s, Cabriolet 5.9 s), however, a road test conducted by the American automotive magazine Motor Trend[13] indicated that it could go from a 0-60 mph (97 km/h) in less than 5 seconds, and make it to 200 km/h (124 mph) in slightly over 20 seconds, although doing this led to fuel consumption dipping into single digits. This was considerably worse than the earlier V6 models, leading to the addition of a $1,700 gas guzzler tax (combined 20.2 miles per US gallon (11.6 L/100 km; 24.3 mpg‑imp)) for the six-speed manual sedan in the United States. Top speed is electronically limited to 250 km/h (155 mph).

The B6 S4 saloon and Avant variants ceased factory production in December 2004, with the Cabriolet ending twelve months later at December 2005.[1]

B6 powertrain

[edit]

Replacing the 2.7-litre 'biturbo' V6 engine of the previous generation B5 S4, the new B6 S4 powertrain[1] gained an all-aluminium alloy 4.2-litre, 40 valve (five valves per cylinder) V8 engine (parts code prefix: 079.C, identification code: BBK), with flywheel-end chain-driven double overhead camshafts, roller-finger rocker arm cam followers, and included variable inlet camshaft timing. It also used a strengthened alloy crankshaft bedplate for the five main bearings, and a two-part baffled oil sump, and a light-alloy variable intake manifold (VIM), containing the fractionally sequentially actuated fuel injectors. This petrol engine, based on the unit from the Audi A8, displaces 4,163 cc (254.0 cu in), and it produces a motive power output of 344 PS (253 kW; 339 bhp) at 7,000 rpm, and generates torque of 410 N⋅m (302 lbf⋅ft) at 3,500 rpm, making it more powerful than the RS2 Avant, and nearly as powerful as the B5 RS4. Engine management was handled by a Bosch Motronic ME 7.1.1 electronic engine control unit (ECU), using a Bosch 'E-Gas' drive by wire electronic throttle, and powering eight individual spark coils with longlife quad-electrode Bosch spark plugs. Ignition timing is a mapped direct ignition, with cylinder-selective knock control with the aid of four knock sensors. The exhaust system includes vacuum-operated valves in the twin rear silencers (mufflers), finished with chrome plated tail-pipes.

Like its predecessors, the B6 S4 was standard with a Getrag six-speed (M6S) manual transmission (parts code prefix: 0A3, identification codes: FVD, HEP) (gear ratios - 1st: 3.667, 2nd: 2.050, 3rd: 1.462, 4th: 1.133, 5th: 0.919, 6th: 0.778),[1] with a 240 mm (9.4 in) single plate dry clutch, and Torsen T-2 quattro permanent four-wheel drive system. Final drive (parts code prefix: 01R, identification code: EXZ) ratios are 3.889,[1] giving a top gear road speed to engine revs ratio of 24.4 miles per hour (39.3 km/h) per 1000 rpm. From July 2003,[1] the ZF 6HP19 tiptronic automatic transmission (parts code prefix: 09L, identification codes: GUR, HHU) (ratios - 1st: 4.171, 2nd: 2.340, 3rd: 1.521, 4th: 1.143, 5th: 0.867, 6th: 0.691, with a final drive (identification code: GDF) ratio of 3.539) was included as an option.

An unusual sight in the engine compartment was the addition of water cooling for the 190 amp alternator,[1] along with two additional thermostatically-controlled side-mounted radiators.[1]

B6 steering, brakes, wheels & tyres

[edit]

The B6 S4 came equipped with electronically controlled, variable assisted 'servotronic' rack and pinion power assisted steering (PAS) as standard.[1]

B6 S4 brakes[1] consisted of radially ventilated disc brakes front and rear. The front discs are sized at 345 mm (13.58 in) in diameter by 30 mm (1.181 in) thick, and are clamped by Continental Teves-ATE FNRG-60 single-piston sliding brake calipers. The rears are 300 mm (11.81 in) by 22 mm (0.866 in), and again use single-piston sliding calipers, with an integrated cable-operated hand brake mechanism. A Bosch ESP 5.7 Electronic Stability Programme system, complete with Anti-lock Braking System (ABS), Electronic Brakeforce Distribution (EBD), Emergency Brake Assist (EBA), Electronic Differential Lock (EDL) and Anti-Slip Regulation (ASR) - also known as traction control system, coupled with a dual-rate tandem vacuum servo provided the brake actuation.

Standard wheels[1] were 'Avus-III' die-cast aluminium alloy, 8.0Jx18H2 ET45 in size, and fitted with 235/40 ZR18 95Y XL (eXtra Load) high performance tyres, with factory supplies being either Continental SportContact2 or Michelin PilotSport PS2.

B6 body & interior

[edit]
Audi S4 Cabriolet interior

Discrete lower door trims, along with the now trademark Audi 'S' model vertical-emphasis line grille, and solid aluminium (later replaced with plastic covered by aluminium) exterior door mirrors, and S4 badging front and rear are all that visually distinguish the S4 from its related A4 brethren. In the interior, front and rear Recaro seats (fronts fully electric with the option of heated seats), as well as S4 logos in the instrument panel and door sills complete the detail.


B7 (Typ 8E/8H, 2005–2008)

[edit]
Fourth generation (B7/8E/8H)
Audi S4 Avant quattro in Sprint Blue with Avus-III alloy wheels (8ED, Europe)
Overview
ProductionNov 2004–Jun 2008[1]
Jan 2006–2008 (cabrio)
AssemblyGermany: Ingolstadt (Sedan & Avant)
Germany: Rheine (Karmann: Cabriolet)
Body and chassis
Body style4-door saloon/sedan,[1]
5-door estate/wagon (Avant),[1]
2-door cabriolet[1]
PlatformVolkswagen Group B7 (PL46)
RelatedAudi B7 A4
Audi B7 RS4
SEAT Exeo
Powertrain
Engine4.2 L V8 40v DOHC[1]
Transmission6-speed Getrag manual,[1]
6-speed ZF 6HP19A tiptronic automatic[1]
Dimensions
Wheelbase2,648 mm (104.3 in)
Cabrio: 2,654 mm (104.5 in)
Length4,586 mm (180.6 in)
Cabrio: 4,572 mm (180.0 in)
Width1,781 mm (70.1 in)
Cabrio: 1,778 mm (70.0 in)
Height1,415 mm (55.7 in)
Cabrio: 1,392 mm (54.8 in)
Chronology
PredecessorAudi B6 S4
SuccessorAudi B8 S4
Audi S4 Sedan quattro (8EC, North America)
Audi S4 Cabriolet with optional 7-spoke alloy wheels (8HE, U.S.)
Audi S4 Avant quattro (8ED, Europe)

The Audi B7 platform Audi S4 quattro, based on the Audi B7 A4, debuted in late 2004. Although Audi classifies it as a new car, the differences between it and the outgoing B6 S4 casually appear to be primarily cosmetic, and is still classified by the internal designation: Typ 8E (although with revised sub-designations - saloon: 8EC, Avant: 8ED, and Cabriolet: 8HE).[1] It has the same 4.2-litre V8 engine (identification code: BBK) as the B6 S4, producing a power output of 253 kW (344 PS; 339 bhp) at 7,000 rpm, and 410 N⋅m (302 lbf⋅ft) of torque at 3,500 rpm.

There are a few mechanical changes, such as revised springs and dampers and, from model year 2007, an updated Torsen T-3 automatically biasing centre differential, featuring a 'default' asymmetric 40:60 front-rear torque split on manual transmission models, along with the later Bosch ESP 8.0 Electronic Stability Programme[1] and gloss black painted brake calipers.[1] The 'Avus-III' wheels now became an option, and were replaced by a standard offering 8.0Jx18 inch 'S-design' 7-spoke forged alloy wheel.[1]

A Bose sound system is now standard, whereas it was optional on the B6 S4, and an enhanced optional DVD-ROM-based RNS-E satellite navigation system replaces the previous CD-ROM-based RNS-D option.

The new trapezoidal single-frame grille, Bi-Xenon high-intensity discharge lamp (HID) headlamps, L-shaped tail-lamps, quad exhaust tail pipes, and discrete V8 badging below the side repeater indicators help distinguish the B7 from the previous B6 model.

Audi S4 25quattro

[edit]
Audi "S4 25quattro" special edition (8EC)

In June 2005,[1] Audi announced a limited edition run of 250 special edition S4 saloon cars, celebrating 25 years of quattro four wheel drive, called the Audi S4 25quattro. Available only in the United States, the exterior has unique front and rear bumpers, a carbon fibre boot lip spoiler and lower front splitter, a rear functional red tow hook, a high gloss Phantom Black painted grille with the "quattro" emblem, and 15-spoke DTM alloy wheels, along with optional dealer-fitted 'Audi four-rings' decals for the front doors. The interior features black and grey contrasting interior leathers, "quattro" embossed into the Recaro seats, and a "1 of 250" exclusive quattro gear shift knob for the manual-only gearbox.

Mechanically, the S4 25quattro was the second Audi, after the B7 RS4, to be fitted with the latest Torsen T-3 asymmetric ATB centre differential for its quattro permanent four-wheel drive system. Under normal grip conditions, this is set with a default rearwards torque distribution bias of 40:60 front to rear, and a maximum of 100% torque can automatically be apportioned to the rear axle (and up to 80% to the front) as conditions warrant. The final drive ratios are 3.889.

B8 (Typ 8K, 2009–2016)

[edit]
Fifth generation (B8/8K)
Overview
ProductionNov 2008–2016
AssemblyGermany: Ingolstadt
Body and chassis
Body style4-door saloon/sedan,[1]
5-door estate/wagon (Avant)[1]
PlatformVolkswagen Group MLB/MLP
RelatedAudi B8 A4
Audi B8 RS4
Audi A5
Powertrain
Engine3.0L supercharged V6 TFSI
Transmission6-speed manual,[1]
7-speed Dual-clutch transmission 'S tronic'[1]
Dimensions
Wheelbase2,811 mm (110.7 in)
Length4,717 mm (185.7 in)
Width1,826 mm (71.9 in)
Heightsaloon: 1,406 mm (55.4 in)
estate: 1,415 mm (55.7 in)
Kerb weight1,650–1,735 kg (3,638–3,825 lb)
Chronology
PredecessorAudi B7 S4
SuccessorAudi B9 S4
Audi S4 Sedan quattro (B8/8K, Australia)
Audi S4 Avant (B8/8K, South Africa)

From November 2008, the fourth generation of the 'Audi S4 quattro'[14] (Typ 8K) entered factory production.[1] It is based on the Audi B8 A4,[15] built on the Volkswagen Group MLB/MLP platform. Unlike the previous B6 and B7 models, the new B8 version was only available as a four-door five-seat saloon (sedan), or a five-door five-seat Avant (estate/wagon). The sport-performance two-door four-seat Cabriolet (convertible) mantle is now taken by the Audi S5 Cabriolet and new Coupe. Unlike previous generations of the S4, only the sedan was imported to the United States and Canada.

Compared to the previous B6/B7 S4 which used a 4.2-litre V8 engine, the B8 S4 uses a smaller displacement 3.0-litre TFSI V6 engine, but now with the addition of forced induction via an Eaton mechanical supercharger.[2]

2012 S4 Avant interior

The previous B6/B7 S4s were the top-of-the-line models in North America, ahead of the 3.2L V6 and 4-cylinder 2.0T A4s, and competed with the BMW E46 330 and E90 335 respectively. The 3.0 TFSI V6 engine replaced the 3.2-litre FSI V6 as the upgrade engine in the A4 and A6 lineups starting for 2009; both the 3.2-litre FSI and 3.0 TFSI were offered together until the end of the 2010 model year.[16] The 3.2L V6 engine is no longer offered in the A4 lineup from the 2011 model year onwards, so the recently introduced B8 S4 is now priced 9% lower than its V8 predecessors, and slots directly above the 4-cylinder 2.0T base model. The S4 now compares more closely with the BMW 335i.

Previously unavailable enthusiast driver aids were now optional, such as Audi's Sport Rear Differential, active steering and adaptive damping suspension (part of the Audi Drive Select Package). The front axle was moved by 6.1 inches to the front, which improved the weight distribution of the B8 Platform. Combined with the Sport Rear Differential Audi was able to greatly improve the weight balance and dynamics of the S4 over previous models.[17][18][19]

A new designed wheel was included on the B8 S4, an 8.5Jx18" '5-double-spoke S' design alloy wheel with 245/40 ZR18 high performance tyres. Optional 19 inch wheel and tyre packages were also available, sized at 8.5Jx19" alloy wheels with 255/35 ZR19 tyres. LED tail lights were standard fitment, along with Audi's now-trademark LED daytime running lights at the front.

The S4 along with the other B8 models received a facelift in early 2012 for the European market and early 2013 for the Australasian market. This included a revised front-end with new headlights and grille, an updated interior, and upgraded MMI options. Mechanically, the facelift B8 (known colloquially as the B8.5) changed to electromagnetic steering and a lighter crown gear center differential.

B8 powertrain

[edit]

At the heart of the B8 S4 powertrain is an all-new, all aluminium-alloy 3.0-litre TFSI Supercharged (TFSI) V6 engine (parts code prefix: 06E, identification code: CAKA),[1] and like the rest of the B8 model range, now with Fuel Stratified Injection (FSI). This petrol engine displaces 2,995 cubic centimetres (182.8 cu in), and it is rated by Audi to a power output of 245 kW (333 PS; 329 bhp) from 5,500 to 7,000 rpm. Torque is rated at 440 N⋅m (325 lbf⋅ft) from 2,900 to 5,300 rpm. This power output is achieved by using forced induction – and specifically, an all-new Eaton 'Twin Vortices Series' (TVS) Roots-type positive displacement compressor.[20][21] This new supercharger features twin four-lobe rotors, which are axially twisted 160 degrees. It is mounted on top of the engine, within the 'Vee', pumping air directly into the inlet manifold, and incorporates two separate water-cooled intercoolers. This new design of supercharger is said to reduce the noise, vibration, and harshness (NVH) of the engine.

This engine is mated to either a six-speed manual transmission (identification code: KMR)[1] or a seven-speed 'S tronic' DL501[22] dual clutch transmission (identification code: LHK),[1] the latter with steering wheel mounted paddle-shifters for tiptronic gear selection, which replaces the Tiptronic automatic transmissions found in the B6/B7 iterations. The 'Audi quattro Sports differential' fitted in the rear axle final drive unit is available as an option.

Acceleration from 0-100 km/h (62 mph) takes 5.1 seconds[23] for the saloon with the manual gearbox, with the Avant one tenth of a second slower at 5.2 seconds. The same dash to 100 km/h (62 mph) in the saloon with S tronic takes 5.3 seconds, and the Avant at 5.4 seconds. The top speed is electronically limited to 250 km/h (155 mph). However, a comparison in the American automotive magazine Road & Track[24] showed the acceleration from 0 to 60 mph (97 km/h) in 4.5 seconds for the 6-speed manual transmission. With figures like these, the B8 S4 accelerates more quickly than its V8-engined predecessors.[2] Audi of America claims that the version of the S4 achieves 28 highway miles per gallon, and a 0 to 60 mph (97 km/h) acceleration time of 4.9 seconds with the manual transmission[25] and 5.1 seconds with the S tronic.[26] Fuel consumption is rated at a combined 24.2 miles per US gallon (9.7 L/100 km; 29.1 mpg‑imp).[23] Therefore, the B8 S4, unlike the V8-powered B6/7 models, avoids the US gas guzzler tax. The B8 S4's 3.0 TFSI engine also gets only 1 m.p.g. less than the base 2.0 TFSI engine.[27] This is one of the most important reasons for Audi to downsize their engines, while keeping the output equivalent better, by using forced-induction such as supercharging or turbocharging.[2]

The 3.0-litre TFSI Supercharged (TFSI) V6 engine is shared with the Audi S5 Cabriolet (though the 7-speed S Tronic is the sole transmission) and the 2013 Audi S5 Coupe. The 2012–2015 Audi A4 3.0 TFSI quattro has a lower-output version of this engine making 272 PS (200 kW; 268 hp) at 4780-6500 rpm and 400 N⋅m (295 lb⋅ft) at 2150–4780 rpm.

Detuned versions of this engine making 310 PS (228 kW; 306 hp) are found in the 2009-11 Audi A6 3.0 TFSI (C6) mated to a 6-speed Tiptronic automatic transmission, the 2012 Audi A6 3.0 TFSI (C7) and 2012 Audi A7 3.0 TFSI, the latter two which are paired with an 8-speed Tiptronic automatic.

Motorsport

[edit]

In motor racing, APR Motorsport has currently entered a B8 S4 in the Grand-Am Continental Tire Sports Car Challenge Grand Sport (GS) class.[28]

B9 (Typ 8W, 2017–2025)

[edit]
Sixth generation (B9/8W)
2017 Audi S4 quattro 3.0 TFSI (UK)
Overview
Production2017–2025
AssemblyGermany: Ingolstadt
Body and chassis
Body style4-door saloon/sedan,[1]
5-door estate/wagon (Avant)[1]
PlatformVolkswagen Group MLB/MLP
RelatedAudi A4
Audi B9 RS4
Audi A5
Powertrain
Engine3.0L Turbocharged V6 TFSI
3.0L V6 TDI (2019-present, European markets only)
Transmission8-speed ZF 8HP tiptronic automatic
Dimensions
Wheelbase2,820 mm (111.0 in)
Length4,726 mm (186.1 in)
4,745 mm (186.8 in) (Avant)
Width1,842 mm (72.5 in)
Height1,427 mm (56.2 in)
Kerb weight1,750 kg (3,858 lb)
Chronology
PredecessorAudi S4 B8
SuccessorAudi S5 B10

Audi announced the B9 S4 in 2015, with the official unveiling of the European-spec model at the 2015 Frankfurt Motor Show. Noticeable changes to the B9 included a modern, more angular exterior, newly designed wheels, and a new turbocharged V6 engine co-developed by Porsche.[29] Unlike the pre-facelift B8 S4, the announced European-spec model is only available with an eight-speed torque converter automatic (ZF 8HP55a).

Audi S4 Avant quattro 3.0 TFSI (UK)
Audi S4 Avant facelift (Germany)

The new model uses LED main-beam and LED daytime running lights as standard, alongside dynamic turn signals and LED tail-lights. Like other Audi models, the notable feature in the new S4 is Virtual Cockpit which has Classic Layout and Sports Layout in displaying speedometer and tachometer.

The B9 S4 features standard 18-inch 5 double-spoke wheels with summer tires, or optional 19-inch 5 V-spoke wheels.

The B9's brakes use multi-piston calipers, replacing the single-piston sliding calipers of earlier models. LED headlights are standard while a flat-bottomed steering wheel, "S" embossed seats, and quad tailpipes differentiate the S4 from the B9 A4.

B9 powertrain

[edit]

The current generation S4 is powered by a 3.0 L V6 with petrol direct injection and a single twin-scroll turbo powering the EA839 engine with 354 PS (260 kW; 349 hp) and 500 N⋅m (369 lbf⋅ft). The engine uses a hot inside V layout, which places the cylinder head exhaust ports, exhaust manifolds, and turbocharger inside the V of the engine; this is a similar arrangement to the twin-turbo V8 engines used in Audi's C7/C8 RS6 and RS7 (including C7 S6/S7).

As a result of the powertrain upgrades in the new S4, it now can accelerate from 0 to 60 mph (97 km/h) in 4.2 seconds.[30] It is electronically limited to a top speed of 155 mph (249 km/h).[31]

In European markets, the facelifted B9 S4 - launched in 2019 - is now powered by a 3.0-litre turbocharged diesel V6 with 347 PS (255 kW; 342 hp) and 700 N⋅m (516 lbf⋅ft), mated to a ZF 8-speed torque converter automatic gearbox and all-wheel-drive. For outside of European markets, however, it still retains the 3.0-litre petrol turbo V6.

See also

[edit]

References

[edit]
[edit]
Revisions and contributorsEdit on WikipediaRead on Wikipedia

Audi S4

View on Grokipedia
from Grokipedia
The S4 is a high-performance variant of the A4 , distinguished by its potent turbocharged or supercharged engines, standard quattro all-wheel drive, sport-tuned suspension, and aggressive styling elements that emphasize dynamic handling and luxury refinement. Introduced in August 1991, the original S4 (Typ 4A, C4 platform) served as a performance-oriented successor to the Audi 200 quattro, based on the sedan and featuring a turbocharged 2.2-liter inline-five-cylinder engine producing 230 horsepower and 258 lb-ft of torque, paired with quattro all-wheel drive and available in sedan or Avant wagon body styles until production ended in 1994. The S4 nameplate returned in 1997 with the B5 generation (Typ 8D), now aligned with the Audi A4 platform as its sportier counterpart, equipped with a groundbreaking 2.7-liter twin-turbocharged delivering 265 horsepower and 295 lb-ft of torque, a six-speed manual or Tiptronic , and quattro drive, marking the model's shift toward compact executive performance with production running through 2002. Subsequent iterations evolved the lineup: the B6 (2003–2004) and B7 (2005–2009) generations introduced a naturally aspirated 4.2-liter with 340 horsepower and 302 lb-ft of —the first V8 in a —offering six-speed manual or automatic options and enhanced interior luxury, while the B8/B8.5 (2009–2016) adopted a supercharged 3.0-liter V6 TFSI producing 333 horsepower and 325 lb-ft of , paired with a seven-speed dual-clutch S tronic transmission for quicker shifts and improved efficiency. The current B9 generation, launched for 2017 and refreshed in subsequent years, features a turbocharged 3.0-liter rated at 349 horsepower and 369 lb-ft of in the 2025 , mated to an eight-speed Tiptronic and standard quattro with ultra for optimized traction, blending advanced driver-assistance systems, a digital cockpit, and 0-60 mph acceleration in about 4.4 seconds while maintaining the S4's reputation as a refined daily driver with track capabilities.

Overview

Introduction and Positioning

The Audi S4 is the high-performance variant of Audi's compact executive A4 lineup, primarily offered as sedan and models since its debut in , with a cabriolet variant introduced for the B6 generation in 2003. Originally based on the C4-generation platform, it transitioned to the A4 architecture starting with the 1997 model year and has been available globally in various markets, including , , and . Body styles include the standard sedan across all generations, the Avant in most iterations for added practicality, and the Cabriolet convertible offered selectively from the early 2000s onward. Positioned as a compact executive sports sedan, the S4 targets buyers seeking a blend of refined daily usability and dynamic driving, directly competing with rivals such as the and C 63. Its design philosophy centers on understated elegance combined with potent acceleration and handling, distinguishing it in the segment through superior all-weather capability. At its core, the S4 embodies Audi's commitment to balancing luxury interiors, advanced performance, and the traction advantages of the proprietary quattro all-wheel-drive system, which distributes power dynamically to all four wheels for enhanced grip and stability. Engine development has progressed from the original turbocharged 2.2-liter inline-five in the 1991 model to naturally aspirated V8s in mid-generation variants and efficient turbocharged 3.0-liter V6s in modern iterations, maintaining a focus on responsive power delivery without sacrificing refinement.

Development History

The Audi S4 was introduced in August 1991 as a high-performance variant of the sedan (C4 platform), representing an early expansion of Audi's S model lineup, which had debuted the previous year with the S2 Coupé and built on the brand's quattro all-wheel-drive technology that achieved notable success in victories from 1981 onward. This inaugural S4 emphasized sporty dynamics while maintaining the luxury sedan ethos, setting the template for subsequent generations as a bridge between everyday usability and performance. Production of the C4 S4 concluded in July 1994, followed by a three-year hiatus before the model's revival on the all-new A4 platform. During this interval, Audi concentrated on other performance offerings, including the RS 2 Avant collaboration with , rather than developing an S4 equivalent for the initial B4-generation A4 (1994–1998). The second-generation B5 S4 debuted in 1997, aligning with the facelifted A4 and reestablishing the model as a core part of 's sport lineup through 2002. Subsequent generations marked significant engineering transitions, with the B6 and B7 (2003–2009) adopting a naturally aspirated V8 for enhanced refinement and power delivery, departing from the inline-five turbo of the C4. The B8 (2009–2016) shifted to a supercharged 3.0-liter V6, prioritizing smoother characteristics, while the B9 (2017–present) returned to turbocharging on a similar V6 displacement for improved efficiency and response. These evolutions reflected Audi's iterative approach to balancing performance with advancing drivetrain technologies across shared MLB platforms. Stricter global emissions standards, particularly Euro 6d and equivalent U.S. EPA requirements, influenced the B9 S4's development, leading to the integration of a 48-volt mild-hybrid starting in 2020 to reduce fuel consumption and CO2 output without compromising acceleration. This trend supported compliance while enhancing low-end via a belt-driven starter-generator. The B5 generation proved commercially strong, with over 12,000 units sold in the U.S. alone from 2000 to 2002, contributing to its status as a sales standout in the S4 lineage amid growing demand for premium sedans. For 2025, the B9 S4 receives minor refinements as a continuation model, including updated software and trim rationalization, marking the final year for the gasoline-powered variant before an anticipated shift to electric successors in Audi's lineup.

C4 Generation (Typ 4A, 1991–1994)

Powertrain

The powertrain of the C4 featured a turbocharged 2.2-liter (2226 cc) inline-five-cylinder with the AAN engine code and 20 valves, producing 230 PS (227 hp) at 5,900 rpm and 350 Nm (258 lb-ft) of torque at 1,950 rpm. This , derived from the 100's inline-five, used a single KKK K03 and Bosch for enhanced performance over the standard models. Power was delivered through a five-speed as standard, with optional six-speed manual or ZF 4HP18 four-speed automatic transmissions available; all were paired with Audi's permanent quattro all-wheel-drive system using a Type-1 center differential for torque distribution. The configuration provided 0–100 km/h (0–62 mph) acceleration in 6.8 seconds and a top speed of 244 km/h (152 mph), with EPA-estimated fuel economy of approximately 16 city and 22 highway.

Chassis, Suspension, and Brakes

The C4 Audi S4 was built on the Audi 100 (C4) platform, a front-engine, unibody chassis with a longitudinal engine layout, emphasizing structural rigidity and weighing approximately 1,610 kg (3,549 lb) for the sedan. It incorporated Audi's quattro all-wheel-drive system with a Torsen center differential that could distribute up to 75% torque to the rear axle under slip conditions. The suspension was independent at all wheels: the front used double wishbones with coil springs, , and gas-pressurized shock absorbers for precise handling, while the rear employed a four-link with trapezoidal trailing arms, coil springs, and an for stability. The S4 rode on 15-inch wheels (optional 16-inch) fitted with 205/55 R15 or 225/50 R16 tires, optimizing grip for the all-wheel-drive system. Braking was handled by a high-performance setup with 310 mm (12.2 in) diameter by 25 mm thick front ventilated discs and 54 mm thick four-piston fixed , paired with 269 mm (10.6 in) by 20 mm rear solid discs and 38 mm single-piston ; an optional upgrade offered 320 mm by 30 mm front ventilated discs with larger for improved fade resistance. The system included ABS as standard, ensuring confident stopping power suited to the vehicle's performance.

B5 Generation (Typ 8D, 1997–2002)

Powertrain

The B5 Audi S4 was powered by a 2.7-liter twin-turbocharged V6 engine (engine codes AGB for manual, AZB for automatic), producing 250 horsepower at 5,800 rpm and 258 lb-ft of torque available from 1,850 to 3,600 rpm in U.S. specifications (265 PS and 295 lb-ft in European markets). This biturbo setup, featuring two K03 turbochargers and sequential operation for reduced lag, marked Audi's first use of twin turbos in a production V6 and emphasized smooth power delivery with the quattro all-wheel-drive system. Buyers could choose between a six-speed (01E) or a five-speed Tiptronic automatic, both paired with the Torsen-based quattro permanent all-wheel drive, which distributed torque variably between axles for enhanced traction. EPA fuel economy was rated at 16 city and 23 highway for the manual sedan, balancing performance with practicality for the . from 0-60 mph took 5.6 seconds for the manual version, with an electronically limited top speed of 155 mph (250 km/h).

Chassis, Suspension, and Brakes

The B5 S4 was built on Audi's Longitudinal Platform (shared with the A4), featuring a front-engine, all-wheel-drive layout with a curb weight of approximately 3,660 pounds (1,660 kg) for the sedan, providing a balanced 59/41 front/rear for agile handling. Its sport-tuned suspension used an independent four-link design at the front and five-link at the rear, with gas-pressurized shock absorbers, progressive-rate coil springs, and larger anti-roll bars compared to the standard A4 for reduced body roll and improved cornering. The system included subframe reinforcements and was calibrated for a firmer ride, enhancing the quattro system's grip without sacrificing daily comfort. The S4 rode on 17-inch alloy wheels fitted with 225/45R17 high-performance tires, contributing to its precise response via hydraulic power assistance. Braking was handled by 312 mm (12.3 in) front ventilated discs with fixed single-piston calipers and 256 mm (10.1 in) rear solid discs with single-piston calipers, augmented by the quattro system's stability and standard anti-lock braking (ABS); this setup provided confident stopping power suited to the model's performance, with fade resistance for spirited driving.

Body, Interior, and Equipment

The Audi S4 of the B5 generation was offered exclusively in sedan and Avant wagon body styles, with no convertible variant available during its production run from 1997 to 2002. The exterior design adopted a subtle yet aggressive aesthetic to distinguish it from the standard A4, featuring a revised front bumper with integrated fog lights, pronounced side skirts, and quad oval exhaust tips integrated into the rear diffuser for a sportier appearance. Available exterior colors included popular options such as Brilliant Black (LY9B), Nogaro Blue Pearl (LZ5M), and Light Silver Metallic (LY7W), with special editions like the 25th anniversary models offering unique pearlescent finishes. Inside, the cabin emphasized luxury and sportiness with standard leather-upholstered Recaro-style sport seats that provided enhanced bolstering for dynamic driving, complemented by optional Alcantara inserts on the bolsters for improved grip. The dashboard and door panels featured brushed aluminum trim accents, creating a premium, driver-focused environment with ergonomic controls and high-quality materials throughout. Standard equipment included headlights with auto-leveling for superior nighttime visibility, while an optional Bose premium audio system delivered rich sound through a 10-speaker setup, including a trunk-mounted . Later models from 2000 onward could be equipped with an optional navigation system integrated into the double-DIN radio. Safety features were robust for the era, with dual front airbags standard across all trims, supplemented by side-impact airbags and head curtain airbags in models from 2000, alongside (ABS) as standard equipment. Unique touches included RS4-inspired badging on the grille and trunk, evoking the high-performance heritage of the RS lineup. The chassis's inherent rigidity contributed to a refined interior ride, minimizing vibrations for enhanced occupant comfort.

Motorsport

The B5 Audi S4 achieved notable success in production-based motorsport, particularly in the SpeedWorld Challenge series during the late 1990s and early 2000s, where Audi Sport UK and Champion Racing developed competition versions. These race-prepared S4s retained the 2.7-liter biturbo V6, tuned to over 400 horsepower through ECU remapping, larger K04 turbos, and upgraded intercoolers, paired with a six-speed sequential gearbox for faster shifts. Aerodynamic enhancements included front splitters, rear wings, and side skirts to improve and stability, while lightweight components such as composite panels and reinforced roll cages reduced weight and increased rigidity. The quattro was adapted with limited-slip differentials for better track traction. Driven by pilots like Michael Galati, the cars secured multiple victories, including the 2001 GT class drivers' and manufacturers' championships in SpeedWorld Challenge, competing effectively against rivals like the and GT3. The program highlighted the S4's potential as a platform, with five built by Audi Sport UK for the series. Privateer entries also appeared in regional events, leveraging the model's balanced handling.

B6 Generation (Typ 8E/8H, 2003–2004)

Powertrain

The B6 Audi S4 featured a naturally aspirated 4.2-liter (engine code BPV) producing 340 horsepower (253 kW) at 7,000 rpm and 302 lb-ft (410 Nm) of at 3,500 rpm. This all-aluminum unit replaced the V6 of the previous B5 , offering smoother power delivery and high-revving performance characteristic of the model. The engine was paired with either a six-speed or a five-speed Tiptronic automatic, both connected to Audi's quattro permanent all-wheel-drive system with a center differential for balanced traction distribution. This setup enabled 0-60 mph acceleration in approximately 5.6 seconds and a top speed limited to 155 mph (250 km/h). Fuel economy was rated at around 17 city and 25 highway under EPA estimates for the automatic version.

Chassis, Suspension, and Brakes

The B6 S4 was built on Audi's platform shared with the A4 (B6), utilizing a combination of and aluminum components for a curb weight of about 3,800 pounds (1,724 kg) in sedan form, providing a balance of rigidity and weight savings. Suspension consisted of a five-link independent setup at the front and a multi-link design at the rear, tuned for sporty handling with firmer damping than the standard A4; 's sport suspension was standard, enhancing cornering precision while maintaining ride comfort. The vehicle rode on 18-inch alloy wheels fitted with 235/40 R18 tires for improved grip with the quattro system. Braking was handled by large ventilated discs: 345 mm (13.6 in) at with fixed and 300 mm (11.8 in) at the rear, delivering strong suited to the V8's output without fade during spirited driving. Electromechanical provided direct feedback, contributing to the S4's reputation for agile yet refined dynamics.

Body and Interior

The B6 S4 was available as a four-door sedan or five-door Avant , measuring 180.1 inches (4,575 mm) in length, 70.1 inches (1,781 mm) in width, and 55.7 inches (1,415 mm) in height for the sedan. The design featured subtle S-specific styling, including a more aggressive front with larger intakes, quad exhaust tips, and aluminum-look mirrors, distinguishing it from the base A4. The interior emphasized luxury with standard leather Sport seats offering eight-way power adjustment and heating for the front row; optional ventilation and rear heating were available. A or aluminum trim accented the dashboard, paired with an analog instrument cluster and optional navigation via the (MMI). The Bose premium sound system was standard, enhancing the cabin's refined ambiance. Cargo space in the Avant reached 52.4 cubic feet (1,483 L) with seats folded. Safety included six airbags and stability control as standard equipment.

B7 Generation (Typ 8E/8H, 2005–2009)

Powertrain

The B7 Audi S4 is powered by a naturally aspirated 4.2-liter (engine code BDX), producing 340 horsepower at 7,000 rpm and 302 lb-ft of at 3,500 rpm. This all-aluminum unit features four-valve-per-cylinder with , a of 11.0:1, and delivers smooth power delivery suited to the compact executive segment. The engine is paired with either a six-speed or a six-speed Tiptronic automatic, both routing power to Audi's quattro permanent all-wheel-drive system with a center differential for torque distribution (typically 40:60 front-to-rear bias under normal conditions). includes a 0-60 mph time of approximately 5.4 seconds and an electronically limited top speed of 155 mph (250 km/h). Fuel economy is rated at 16 mpg city and 24 mpg highway (EPA estimates for the automatic sedan).

Chassis, Suspension, and Brakes

The B7 S4 is built on Audi's Longitudinal Platform (shared with the A4 B7), utilizing a mix of steel and aluminum components for a curb weight of approximately 3,814 pounds (1,730 kg) in sedan form, providing a balance of rigidity and weight savings. Suspension is independent multi-link at both front and rear axles, with sport-tuned springs and dampers for enhanced handling; the system includes anti-roll bars and is designed to complement the quattro all-wheel drive. Standard 18-inch alloy wheels are fitted with 235/40 performance tires for grip. Hydraulic power-assisted rack-and-pinion steering offers direct response. Brakes consist of 13.6-inch (345 mm) ventilated front discs with fixed and 11.8-inch (300 mm) ventilated rear discs with single-piston sliding , providing strong stopping power calibrated to the V8's output; ABS and electronic brake-force distribution are standard.

Special Editions

The Audi S4 25quattro is a limited-production variant of the B7-generation S4, created to commemorate the 25th anniversary of Audi's quattro all-wheel-drive technology, which debuted in 1980. Announced in June 2005 and available as a 2006 model-year sedan, production was capped at 250 units worldwide, making it a rare offering primarily targeted at enthusiasts in and . Exterior modifications draw inspiration from Audi's DTM racing program, featuring revised front and rear bumpers for a more aggressive stance, along with the exclusive Silver Pearl Effect paint—a metallic gray-blue finish that enhances the car's sporty profile. Exclusive badging, including "25quattro" emblems on the grille and trunk, distinguishes it from standard B7 models. The remains unchanged from the base S4, retaining the 4.2-liter with 340 horsepower and 302 lb-ft of , but it pairs exclusively with the six-speed and incorporates the then-new Type-3 asymmetric center differential for refined all-wheel-drive distribution. Inside, the cabin emphasizes exclusivity with black and jet gray silk Nappa leather upholstery on sport seats embossed with "quattro" lettering, a numbered "1 of 250" plaque, and a distinctive shift knob bearing the edition's . Additional upgrades include RS4-sourced carbon fiber accents for the , center console, and door trims, providing a premium, motorsport-derived contrast to the standard aluminum or wood inlays. These features were offered as a dealer-orderable package, elevating the S4's luxury without altering its core mechanicals. No other factory-limited variants were produced for the B7 S4 beyond the 25quattro, though some markets offered optional DTM-style aesthetic packages on non-special-edition models. The edition's sedan-only configuration underscores its focus on performance heritage, with no convertible (Kabriolet) version documented.

B8 Generation (Typ 8K, 2009–2016)

Powertrain

The B8 Audi S4 is powered by a 3.0-liter supercharged V6 TFSI engine (engine code CAKA), producing 333 horsepower (245 kW) at 5,500 rpm and 325 lb-ft (440 Nm) of torque from 2,900 to 5,300 rpm. The engine features a roots-type Eaton supercharger for low-end torque and immediate response, paired with direct fuel injection and variable valve timing. Early models offered a six-speed manual transmission, while most were equipped with a seven-speed S tronic dual-clutch automatic for faster shifts and efficiency. Power is delivered to all wheels via Audi's quattro all-wheel-drive system with a center differential, providing 40:60 front-to-rear torque bias under normal conditions. The 2013 facelift (B8.5) introduced cylinder-on-demand technology, deactivating three cylinders under light loads to improve fuel economy to 18 mpg city and 28 mpg highway (EPA estimates). Performance includes 0-60 mph in 4.9 seconds for the S tronic version and an electronically limited top speed of 155 mph (250 km/h).

Chassis, Suspension, and Brakes

The B8 S4 is built on Audi's MLB (Modular Longitudinal Platform), utilizing a mix of high-strength steel and aluminum for a curb weight of approximately 3,800 pounds (1,725 kg) and improved rigidity over the B7. This construction enhances handling and crash safety while maintaining the model's sporty character. The suspension features a five-link front setup and a trapezoidal-link rear multi-link design, both independent with sport-tuned springs and anti-roll bars. Adaptive dampers were optional via Audi drive select, allowing adjustments for comfort or dynamic modes. The S4 rides on 18-inch or optional 19-inch alloy wheels with 245/40R18 or 245/35R19 summer tires, optimizing grip for the quattro system. Braking is handled by 345 mm (13.6 in) front ventilated discs with four-piston fixed and 330 mm (13.0 in) rear ventilated discs with single-piston floating , providing strong and fade resistance. Electromechanical offers precise feedback, and the quattro system includes an optional sport differential for rear in later models. The 2013 facelift refined steering calibration for sharper response.

Body and Interior

The B8 S4 was available in sedan, Avant wagon, and body styles, with the Cabriolet featuring a power soft top. Dimensions include a length of 185.7 inches (4,717 mm), width of 71.9 inches (1,826 mm), and of 110.6 inches (2,810 mm), balancing sportiness and practicality. The Avant offered up to 50 cubic feet (1,420 L) of cargo space with seats folded, while the sedan provided 12.4 cubic feet (351 L) in the trunk. Exterior styling included aggressive S-specific elements like a larger grille, hood vents, quad exhausts, and 18-inch wheels, with the 2013 facelift adding revised bumpers, LED daytime running lights, and optional matrix LED headlights. The interior featured sport seats with bolstered sides and Alcantara or upholstery, a flat-bottom , and aluminum or carbon fiber trim. was centered on the MMI system with a retractable 7-inch screen (upgraded to 8-inch and in B8.5), supporting , Bluetooth, and optional Bang & Olufsen audio. Analog gauges were standard, with a driver information display; included stability control, multiple airbags, and optional adaptive cruise. The B8.5 facelift integrated improved MMI and aids.

Motorsport

The B8 Audi S4 saw limited but specialized use in professional and amateur motorsport during the 2010s, serving as the platform for entries in production-based GT series such as the Pirelli World Challenge (PWC). APR Motorsport prepared and campaigned the model in the GTS class, debuting the No. 56 car at the and subsequent rounds, including , where driver Ian Baas set the fastest practice lap of 1:31.345 at an average speed of 100.104 mph. These race-prepared B8 S4s featured significant modifications to the production 3.0-liter TFSI supercharged , tuned to produce over 400 horsepower through ECU remapping, enhanced boost, and supporting hardware like larger intercoolers. The powerplant was mated to a sequential gearbox for rapid shifts under conditions, complemented by an aerodynamic kit including front splitters, rear diffusers, and side skirts to optimize and stability at high speeds. Further technical upgrades included lightweight carbon fiber or composite body panels to reduce overall weight and improve power-to-weight ratios, along with enhanced cooling systems—such as larger radiators and oil coolers—to sustain performance during extended sessions, exceeding the street car's thermal management capabilities. The quattro all-wheel-drive system was retained and reinforced, with stiffening via roll cages and suspension recalibration for better cornering grip. The street provided the foundational forced-induction setup for these race engines. Beyond PWC, the B8 S4 inspired adaptations for regional series, including private team entries in Australian GT and events where the model's balanced suited circuit racing. Rallycross variants emerged in amateur competitions, leveraging the AWD layout for traction on mixed surfaces, though no major professional class victories were recorded in these formats. Notable achievements included class podiums in select GT events by teams like APR, highlighting the model's competitive potential against rivals such as M3s and 911s.

B9 Generation (Typ 8W, 2017–present)

Powertrain

The powertrain of the B9 Audi S4 centers on a 3.0-liter turbocharged V6 TFSI engine with the DCB engine code, delivering 349 horsepower at 5,400 rpm and 369 lb-ft of available from 1,370 to 4,500 rpm. This EA839-series engine replaces the previous supercharged setup, emphasizing efficiency and low-end response through turbocharging, while maintaining the model's performance heritage. In the market, the gasoline-powered S4 uses this standard turbocharged engine without mild-hybrid assistance; European diesel variants incorporate a 48-volt mild-hybrid system. Power is routed exclusively through an eight-speed Tiptronic paired with Audi's quattro ultra all-wheel-drive system, which uses predictive algorithms and sensors to engage the rear axle on demand for optimized traction and efficiency. This configuration yields EPA-estimated fuel economy of 20 mpg city and 29 mpg highway, balancing spirited driving with reduced consumption compared to prior generations. Performance metrics include a 0-60 mph sprint in 4.4 seconds and an electronically limited top speed of 155 mph, underscoring the powertrain's blend of power and refinement.

Chassis, Suspension, and Brakes

The Audi S4 of the B9 generation (2017–present) is constructed on the MLB Evo modular longitudinal platform, which incorporates a mix of high-strength steel and aluminum components to achieve a lighter with enhanced torsional rigidity compared to the preceding B8 platform, thereby improving structural integrity, handling precision, and overall efficiency. Its suspension system features a sophisticated five-link independent design at both the front and rear axles, enabling precise wheel control and superior ride compliance; adaptive dampers are standard, allowing drivers to select from modes like Comfort, Auto, Dynamic, and Individual via Audi drive select for tailored damping characteristics that balance everyday usability with spirited driving. The S4 rolls on 18- or 19-inch alloy wheels wrapped in 245/35 performance summer tires, which provide optimal grip and low suited to the quattro all-wheel-drive system. The braking setup includes large 13.7-inch (350 mm) front ventilated discs paired with eight-piston fixed for strong, fade-resistant , complemented by 13.0-inch rear discs with single-piston ; optional carbon-ceramic are available for further weight reduction and sustained performance under high loads. Electromechanical delivers progressive assistance with a direct feel, while the optional dynamic all-wheel steering system enables the rear wheels to turn up to 5 degrees in phase with the fronts at low speeds for tighter turning radii or out of phase at higher speeds for enhanced stability. With a curb weight of approximately 3,880 pounds, the is optimized through strategic material use for overall without compromising . The are calibrated to deliver rapid response suited to the vehicle's characteristics, ensuring confident modulation in varied conditions.

Body and Interior

The Audi S4 in the B9 generation (2017–present) is offered in two body styles: a four-door sedan and a five-door Avant , with no variant available following the end of the B8 generation. The sedan's compact executive dimensions measure approximately 187.5 inches in length, providing a balance of sporty proportions and practicality, while the Avant adds cargo versatility with up to 50 cubic feet of space when the rear seats are folded. Externally, the S4 features S-specific styling elements that distinguish it from the standard A4, including aggressive front and rear bumpers with larger air intakes, quad exhaust tips integrated into the diffuser, and 19-inch alloy wheels as standard. Matrix-design LED headlights are standard, offering adaptive high-beam assist and dynamic turn signals for enhanced visibility and aesthetics, while available colors include the striking Navarra Blue metallic, which accentuates the car's athletic lines. The rigidity contributes to a quiet cabin environment, minimizing road noise intrusion. Inside, the S4's cabin emphasizes luxury and technology with a driver-focused layout featuring Nappa leather upholstery in higher trims, providing supple support and a premium feel. The system utilizes dual touchscreens—a 10.1-inch upper display for navigation and media, and an 8.6-inch lower unit for climate and vehicle controls—integrated seamlessly into the dashboard. A 12.3-inch digital gauge cluster, known as the Virtual Cockpit, delivers customizable information displays. Standard equipment includes wireless smartphone charging and a sound system, with options like an that projects navigation cues onto the windshield for intuitive guidance. Safety features are comprehensive, with Traffic Jam Assist enabling semi-autonomous driving in low-speed congestion via and lane centering, complemented by a 360-degree camera system for precise maneuvering. The S4 earns a five-star overall rating from the NHTSA, reflecting strong performance in frontal, side, and rollover crash tests based on the shared A4 platform. In later models, particularly post-2020 facelifts, incorporates sustainable materials such as recycled in seat fabrics and floor mats, aligning with the brand's environmental goals without compromising luxury.

Facelifts and Updates

The B9 generation Audi S4 received its mid-cycle facelift for the , featuring revised exterior styling that included a broader and flatter Singleframe grille, updated front and rear bumpers, new LED headlights, and redesigned taillights to align with 's evolving . The interior updates centered on the introduction of the third-generation MMI system, which replaced the traditional rotary controller with a responsive interface and haptic feedback for improved usability. While the core 3.0-liter turbocharged V6 powertrain remained unchanged for gasoline models, European diesel variants incorporated a 48-volt mild-hybrid system to enhance efficiency and reduce emissions. For the 2024 model year, focused on enhancing standard safety and convenience features across the S4 lineup, including the addition of , lane-keeping assist, traffic sign recognition, and a heated as standard equipment on all trims. These updates built on the existing powertrain without altering core power output, aiming to improve overall driver assistance capabilities and comfort for daily use. Optional new wheel designs, such as 19-inch 5-arm torsion-style alloys, became available to complement the sport-tuned . The 2025 Audi S4 carries forward these enhancements with no significant changes to the 349-horsepower 3.0-liter or eight-speed automatic transmission, maintaining its balance of performance and refinement. Starting at an MSRP of $56,195 for the base Premium trim, it includes advanced driver assistance systems like intersection assist and adaptive cruise with traffic jam assist as standard, further elevating safety and semi-autonomous driving features. The model is offered in three trims—Premium, , and Prestige—each escalating in technology and luxury: the Premium provides core features like LED headlights, leather upholstery, and a 10.1-inch ; adds a sound system, wireless charging, and top-view camera; while Prestige tops the range with a , matrix LED headlights, and enhanced adaptive suspension controls. Looking ahead, the gasoline-powered S4 is expected to conclude its run with the 2025 model year, as Audi transitions the A4/S4 platform toward full in line with its to introduce only electric vehicles from 2026 onward. The next-generation successor, rebadged as part of the A5 lineup, will likely adopt an all-electric on the Premium Platform Electric (PPE), emphasizing sustainable performance while retaining the model's sporty character. All B9 S4 models are assembled at Audi's primary production facility in , , where the plant's advanced manufacturing processes support high-volume output of premium sedans with quattro all-wheel drive.

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