The Porsche 911 Turbo Carrera RSR was built in 1974 in four specimens to take part in the racing season of the World Constructors Championship. Thus it was possible to witness the participation of the factory with one and sometimes two cars under the colors of the Martini Racing Team, and entrusted to the official crews Muller - van Lennep and Koinigg - Schurti. Despite having almost equal power (about 500 hp) to that of rival cars, the Porsches did not have the lightness or handling of the latter, which ran in the Prototype category. However, a fortunate combination of speed and reliability made it possible to achieve respectable results in the nine races on the calendar, including two second places: one at the 24 Hours of Le Mans and one at the 6 Hours of Watkins Glen.