Audi 90 quattro IMSA GTO, model year 1989

1989: most powerful five-cylinder works engine in motorsport:
At the 1989 IMSA GTO in the USA, the Audi 90 quattro competes in its races with the most powerful fivecylinder works engine. The turbocharged aluminum engine is a 2.2-liter high-performance unit specially designed for racing. It develops 530 kW (720 hp) at 7,500 revolutions per minute and delivers 720 newton meters (531.04 lb-ft) of torque at 6,000 rpm. Overall, the Audi 90 quattro IMSA GTO wins seven races in the American touring car series in the 1989 season.