Documenting A Very Rare Breed

The 1992 Porsche 911 Turbo S2

911 Turbo S2 Engine

The 964 based Type M30/69 3.3 liter turbo engine was an extension of the 930/68 engine used in the previous 1989 911 Carrera turbo with added characteristics of the 964 engine. Mounting bosses, crankcase bolts and head fins all mirrored the 964 design. As with 964 engine there was no engine-mounted oil cooler on the engine the oil cooler mounted in the right front wheel arch. The exhaust system had two tail pipes, one from the final muffler and one from the wastegate muffler. Finally, engine power was lifted to 315HP by use of a less restrictive catalytic converter, a new larger intercooler, and an improved digital ignition.

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911 Turbo S2

911ts2-1When Porsche introduced the 1991 964 Turbo in September 1990 it was in need of a racing forum on which to prove out the car’s heritage. Fortuitously in 1991 the International Motor Sports Association (IMSA) created the Bridgestone Potenza Supercar Championship designed to allow the best sports cars in the world to race each other and Porsche Motorsport North America undertook to convince then Porsche CEO Arno Bohn that the IMSA Supercar Championship gave Porsche the best possibility to win.

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IMSA Supercar

IMSA was founded in 1969 with its first official ‘season’ being a six race series won by Peter Gregg and Hurley Haywood in a Porsche 914/6 GTU (Grand Touring Under 2.5 liter class). Over subsequent years Porsche became a familiar winner in IMSA including the endurance races 24 Hours of Daytona and the 12 Hours of Sebring. Peter Gregg and Hurley Haywood would be frequent participants in IMSA classes.

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