Porsche 911 Carrera RSR

The Porsche 911 Carrera RSR is a competition car that Porsche built in 1973 and 1974 from the road-going 911, for the Group 4 rules and later Group 5. It was developed from the 911 Carrera RS and announced at the Paris Salon in autumn 1972, then made its debut at Daytona in 1973 with Hurley Haywood and Peter Gregg. The factory team raced it in the 1973 and 1974 World Championship for Makes, taking third overall in the constructors' table and the GT category both years, and privateers used it until 1981 in the World Championship for Makes, in the European GT Championship, the German DRM and IMSA in North America. The first version had a 2.8 litre flat six from the Carrera RS 2.7 making 308 CV at 8,000 rpm. In 1974 it received a 2.1 litre turbocharged engine of 480 CV as the Carrera RSR Turbo 2.1, and a 3.0 litre naturally aspirated version was the last development. The Turbo 2.1 became the base for the 934 and 935.