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  Porsche 911 Carrera RSR
 

  Article Image gallery (55) Chassis (3) Specifications  
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Country of origin:Germany
Produced in:1973
Numbers built:8
Successor:Porsche 911 Carrera RSR Turbo 2.1
Author:Wouter Melissen
Last updated:May 02, 2014
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Click here to download printer friendly versionCulminating in the double Le Mans winning 917, Porsche developed and raced ever bigger sports prototypes for nearly two decades. When rule changes at the end of the 1971 season rendered the 917 obsolete, the German manufacturer turned their attention to GT racing. Dubbed the Carrera RSR 2.8, the new Porsche GT racer used the 911 production car as a base. For homologation purposes, the road going 911 Carrera RS 2.7 was also created.

While Porsche intended the new GT car to be campaigned by privateers, eight pre-production prototypes were also constructed. These were used for development purposes but were also raced in select rounds of the World Championship by the works drivers. In addition to the works team, favoured customers like the American Brumos and Penske teams were also entrusted with these development cars.

The Carrera RSR was built around a production 911 shell, stripped off all unnecessary amenities. Both the suspension location and geometry were optimised during the development process. The brakes were upgraded and featured ventilated and cross-drilled discs and 917-sourced four-pot callipers. The bodywork featured extended wheel arches to clear the wider wheels and tyres. At the front an oil cooler was fitted, while the engine cover featured a 'duck-tail' wing.

First enlarged to 2.7 litre for the Carrera RS road car, the early RSR competition cars featured a 2.8 litre version of the regular production 911 engine. The flat six was carefully developed for competition use and featured twin-spark ignition, larger intake and exhaust ports, more aggressive camshafts and Bosch fuel injection. In this guise, the air-cooled engine produced an impressive 308 bhp. It was mated to a five speed gearbox, while a limited slip differential was also fitted.

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  Article Image gallery (55) Chassis (3) Specifications