California Porsche dealer, Vasek Polak, would buy five of the original production run of 30 cars. The ready-to-race price of admission from Porsche was 108,000 Deutschmarks (about $43000 US). While the factory run 935s went off to fight in World Championship events, the 934 came out swinging in the GT class wholly represented by privateer teams. Using the 930’s Bosch K-Jetronic injection (the first racecar to use the system), contactless ignition, 6.5:1 compression ratio and boost set at 1.4 bar (20psi), the single turbo 930/71 engine started 1976 with 485hp at 7000rpm, but would eventually rise to over 550hp in 1977. Coil springs were added to the torsion bar suspension, as well as anti-roll bars front and rear. The suspension remained largely stock 930, but with ball joints and hard nylon bushings replacing rubber. Massive, radically vented disc brakes and robustly finned aluminum calipers were borrowed from the all-conquering 917, all of which barely fit inside the new BBS wheels. Racing modifications were spearheaded by Norbert Singer’s protégée, Wolfgang Berger, and comprised a bigger turbo attached to the 930’s 3.0L flat-six engine, larger 16” wheels and tires, additional fender flares and the 934’s distinctive front air dam that housed radiators for two air-to-water intercoolers. With a fuel tank capacity of 26.4 gallons (120 liters), the 934 was a heavy car, so Porsche set about making it fast. New rules required a rather portly minimum weight of 2470 lb (1120 kg) without fuel. Gone were the days of the 911 lightweight specials like the RS and RSR. In fact, aside from the removal of the rear seats, some trim and soundproofing material, and the addition of an aluminum roll cage and front strut X-brace, the 934 could almost pass for a stripped-out road car. It was homologated by the sale of the production 930 road car, and was the racecar that bore the closest resemblance with its original headlights, bumpers, door trim, and even electric, glass windows. So where does that leave the overlooked middle kid? The 934, also called the RSR Turbo, was built for Group 4 racing and debuted in 1976 alongside its Group 5 brother, the 935.
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