Turbo S2

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, in street-stock form. The series was to feature many cars including; the Chevrolet Corvette ZR-1, Lotus Esprit Turbo, Honda NSX, Pontiac Firebird and the Porsche 944, but to qualify the 964 Turbo for entry, IMSA regulations required Porsche AG to deliver a minimum of twenty road versions or homologation models to America and the factory agreed, but only after extensive lobbying by Hans-Joachim Stuck himself an extraordinarily accomplished Porsche racing driver had convinced Porsche’s Arno Bohn that a Porsche 964 Turbo entry in the IMSA Supercar series would be worthwhile. The idea was also strongly supported by Alwin Springer the successor to Al Holbert as the director of Porsche Motorsports North America.

The Porsche option code for the 964 Turbo homologation model was TS2, but the twenty cars that left Zuffenhausen on the typical slow journey across the Atlantic Ocean to the East Coast of the USA were standard US market versions. The conversion process to create the S2 model itself would not begin until the twenty cars embarked on another journey to Andial Road and Racing in California.

Andial is a highly respected builder and tuner of Porsche road and race cars based in Santa Ana, California. The company was founded by Alwin Springer, Arnold Wagner and Dieter Inzenhofer (the company name was created using the first two letters of each founder's forename). At the time Andial shared the same facility with Porsche Motorsport North America in Santa Ana which was very convenient. On arrival at Andial all 20 cars were be fitted with the $11,072 TS2 engine kit option developed by the company. This option kit included; more aggressive cams, a larger K27 turbocharger and modified intercooler. After the modifications were completed the engine was redesignated the M30/69S.

The modified engine was reputed to produce approximately 381 brake horsepower at @ 6200 rpm and delivered 354 lb-ft of torque at 4800 rpm and for many represents the pinnacle of the 3.3 liter turbo charged, air cooled engine produced by Porsche. No actual paperwork exists to prove these figures which are considered by many to be quite conservative.

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