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Phone: 831-430-9940 • See More race cars • Contact Us about this Car
1976 Porsche 934 Trans Am
REQUIST
A printable PDF document with Photos
Vasek Polak Team Car
Chassis No: 903 670 0179
In 1976 the Porsche 934 was eligible for the SCCA Trans Am championship and Vasek Polak fielded a two-car team with drivers George Follmer and Hurley Haywood. The turbocharged Porsches were dominant throughout the 1976 Trans-Am Championship season, with Follmer taking the championship. This car is the car the Haywood drove that season scoring one victory and 4 top ten finishes. Haywood also drove this car at the Laguna Seca IMSA race finishing in 10th. The car has recentely been completely restored back to it's 1976 Trans Am configuration.
Race History of This Car
1976
Trans AM
Haywood; 1st., Nelson Ledges
Haywood; 2nd., Portland
Haywood; 6th. Watkins Glen
Haywood; 19th,. Road America
Haywood DNF, Brainerd
Haywood; 4th., Mosport
Haywood; DNF, Trois Rivieres
IMSA
Haywood; 10th., Laguna Seca
1977
6 Hours Watkins Glen: Guthrie, Lewis, 10th
Watkins Glen: Belcher, Woods, 1 5th.
Mosport: Shelton, McKitterick, DNF.
Background
In 1975 Porsche introduced the Turbo Carrera RSR, a race -tuned version of the 930 Turbo Street car. The race car was built to the FIA Group 4 specifications which meant that in many ways it was still a street Porsche.
The body as left intact except for fiberglass flares which were pop riveted to the existing fenders. A large front spoiler that also hid the engine’s oil and water coolers replaced the stock front bumper. Inside the cockpit much of the production car interior was left intact. The power window lifts, the door-mounted map compartments and other items were left in place so the car could meet minimum weight requirements. A roll cage, turbo boost knob, racing seat, and other safety items were added.
The 934 retains the production suspension pick up points with
coil over adjustable Bilstein shocks front and rear. Adjustable anti-rool
bars are fitted along with BBS alloy wheels (10.5x16 front and 12.5x16 rear).
The brakes are taken from the 917 with cross drilled rotors and 4-piston calipers.
The transmission is the standard street 930 four speed. The engine differs
little from the production 930, except for boost control and altered cam timing.
Only 31 934s were built in 1976
Based around Porsche's production 930, the 934 weighed in at 1120kg, just 20kg less than the stock model. This was because the Typ 930/50 3-litre motor that had been homologated in the H-series 911 Turbo was classed on the basis of its swept volume equivalency of more than 4-litres. Cars of between 4 and 4.5-litres had a minimum weight requirement of 1120kg, allowing Porsche to strip 934 right down and then strategically reposition the ballast to bring it back up to weight. Some parts inevitably stayed though and these often included stock door trim and even electric windows. More importantly, 934's were equipped with fully-adjustable suspension and anti-roll bars plus cross-drilled and ventilated discs with finned calipers. 16-inch BBS alloys were fitted along with a 32-gallon fuel cell under the front lid. The new Typ 930/75 turbocharged engine used a standard engine casing, crank, connecting rods and cylinder heads while at 2993cc, displacement was unchanged from the road car, as was compression at 6.5:1. With new pistons and water cooling for the air passing between the KKK turbocharger to the induction, output rose to 485bhp at 7000rpm. This was running at 1.3bar, however, well in excess of 500bhp was available with a little more boost. A complex twin Behr intercooler arrangement was housed in the deep front spoiler and allowed the engine to run more efficiently and reliably, revised Bosch K-Jetronic injection, larger intake ports and a reinforced four-speed gearbox also being added.