Porsche 962 C
After considerable success with the 956, Porsche decided they wanted to use the platform for an IMSA/GTP class car, but IMSA regulations changed in 1984, now dictating that every vehicle entered into the series had to have its pedal box mounted behind the front axle line, which the 956 did not.
To make it eligible under the new rules, and following crash tests on 956 chassis #004 (the third-placed 1982 Le Mans finisher), the 956's wheelbase was increased to make room for the pedal box. A steel roll cage was also integrated into the new car. Work was underway on a larger engine, but in the meantime a modified version of the 934-derived 2.8 L engine was used, featuring a single Kühnle, Kopp und Kausch AG K36 turbocharger instead of the twin K27 turbochargers of the 956, as twin-turbo systems were not allowed in GTP class racing at the time.
Porsche dubbed the revised vehicle the 962 and debuted a total of five units at the Daytona 24 Hours with Mario and Michael Andretti driving the factory car and the other four being driven by members of the privateer teams which had purchased them. The factory car lead the race until it retired during lap 127 with engine and gearbox problems.
Porsche went back to a twin-turbocharged 3.2 L engine for 1985, re-naming the car 962C and entering it in the World Endurance Championship, but ironically the car lost to an older 956, which had already taken WEC top-honors four times.