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  Porsche 934      

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Country of origin:Germany
Produced in:1976
Numbers built:31
Price new:DM 97,000
Internal name:930
Successor:Porsche 934½
Author:Wouter Melissen
Last updated:February 10, 2016
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Click here to download printer friendly versionBased on the newly introduced 911 Turbo (930), Porsche first created a Group 5 competition car (935) and then readied a Group 4 version (934) for the 1976 season. In addition to the obvious mechanical differences, the 934 would be available to Porsche's customers, whereas the 935 was raced exclusively by the works team. As such the 934 replaced the highly successful 911 Carrera RSR.

The relatively strict Group 4 regulations stipulated that at least 400 examples of the road car needed to be produced for homologation purposes. To balance the performance of the Group 4 machinery, the regulations included a sliding scale for the minimum weight related to the size of the engine. Taking in account the 1.4 equivalency factor for turbocharged engines, the three-litre 934 fell in the over four-litre bracket, which corresponded with a minimum weight of 1,120 kg.

Considering the relatively high weight limit, the Porsche engineers did not need to spend much time and effort to strip excess weight from the standard 911 Turbo shell. Even the electric windows could be retained. Subtle changes included a switch from rubber to nylon bushings, and the addition of coil springs to tighten up the suspension. Stopping power for the relatively heavy 934 was provided by ventilated and cross-drilled discs similar to those used on the Porsche 917.

The turbocharged flat-six engine was derived from the production unit, with reinforced internals to cope with the additional strains of racing. As a conventional intercooler was not fitted on the production road car, Porsche had to find a creative method of cooling the intake gases. A pair of water radiators were fitted in the nose, which fed cooled water to cores on top of the intake. Depending on the turbo-boost used, the engine produced between 485 bhp and 580 bhp.

The Group 4 regulations allowed for only very few modifications to the body. As a result, the production rear-wing had to be used, which was also one of the reasons that a conventional intercooler could not be fitted. The deeper front air-dam also featured a cooler for the engine oil. The 934 also featured flared wheel arches to clear the wider front and rear tyres. In the cockpit, additional gauges informed the driver of the turbo-boost and fuel-pressure.

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  Article Image gallery (189) Chassis (13) Specifications User Comments (1)