Isuzu Piazza

The Isuzu Piazza is a small, sporty 3-door liftback coupé which was manufactured by Isuzu from 1981 until 1992 in two generations. The Isuzu Piazza was marketed as the Isuzu Impulse in North America and as the Holden Piazza in Australia.

The first generation Piazza was a rear-wheel drive car, and in the United Kingdom it was the first widely available Isuzu passenger car. The second generation was available as front-wheel drive or all-wheel drive. It was the basis for the lower-priced Gemini Coupé, known as the Geo Storm in the US market.

As of 2010, the number of registered Impulses in North America totaled only 2,300, making Impulses very rare.

In 1978, Isuzu commissioned Giorgetto Giugiaro to design a new sporty car to replace the 117 Coupe (also a Giugiaro design). They delivered several T Series Chevettes (developed in 1973 in South America) to the Italdesign studio in Italy and allowed Giugiaro free rein over the design. The result of this effort was the wedge-shaped three-door hatchback called the Asso di Fiori ("Ace of Clubs") prototype and show car. It was shown at the 1979 Tokyo Motor Show to rave reviews. Giugiaro referred to the design as his fifth "Copernican revolution", integrating the design innovations of many different previous designs into one, mass producible, vehicle. Within 48 hours of its unveiling at the Tokyo Motor Show, Isuzu fast tracked the vehicle into production with minimal changes to the design. Items that remained included the single blade front windshield wiper, and an integrated steering wheel adjustment that also moved the instrument cluster, with wiper controls and exterior lighting controls installed just behind the steering wheel on either side, a feature that later appeared on the Ford Probe.

The first Piazza rolled off the production line in September 1980 in Fujisawa, Japan, available with either 120 PS (88 kW), 120 lb⋅ft (163 N⋅m) 2.0 L SOHC inline-four MPFI engine, a carryover from the Isuzu 117 Coupé, or a 135 PS (99 kW), 123 lb⋅ft (167 N⋅m) 2.0 L DOHC MPFI I4 engine. Five-speed manual and 4-speed automatic transmissions were available, and all models were rear-wheel drive. In April 1984, a 180 PS (132 kW), 185 lb⋅ft (251 N⋅m) turbocharged SOHC I4 engine was introduced, and the DOHC naturally aspirated engine was phased out in years that followed. Piazzas were available in a multitude of trim levels including Bella, XN, XJ, XE, XG, Nero, and others. There were three different suspension tuning levels, standard, Irmscher, and Lotus. Production continued through 1990.

For the US market, this vehicle was introduced as the Impulse in 1983. For the 1983 and 1984 model years, only one engine was available, the 2.0 L SOHC inline-four engine, rated at 90 hp (67 kW), 108 lb⋅ft (146 N⋅m). A MPFI turbocharged model was introduced in 1985, with a 2.0 L SOHC engine rated at 140 hp (104 kW) and 166 lb⋅ft (225 N⋅m). The 1987 model year had the RS model which came with a 4ZC1 turbo engine. The 1988 model year saw several changes. Mild exterior and interior changes were made to the appearance of the vehicle (including a larger rear spoiler and fixed headlights without pop up covers).

The 2.0 L non-turbo engine was replaced with a 2.3-liter version, rated at 110 hp (82 kW) and 127 lb⋅ft (172 N⋅m) of torque. The 2.3 L engine was offered only in the US market, because the larger engine would have obligated Japanese consumers to pay more annual road tax, thereby affecting sales, as well as the larger engine conflicted with Japanese government regulations concerning maximum displacement for cars classified as "compact". All Impulses received a Lotus-tuned suspension beginning in the 1988 model year, which consisted of redesigned sway bars, stiffer dampers, and a change in previous spring rates.

In the US market, the Impulse was marketed as "everything standard", meaning that all Impulses came with all available equipment for the vehicle's model year, and only two trim levels offered: non-turbo and Turbo. There were, however, some special edition models, most notably the RS model of the 1987 model year, available only in white body color with pewter color trim, and featuring the stiffest suspension available on any Impulse, very close to the Irmscher suspension sold only in Japan. For the 1989 model year, a Special Edition non-turbo model was offered which was equipped with the Turbo model wheels and interior trim.