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1974 Porsche Carrera RSR 3.0

The factory-built 911 competition cars included the 911R of two liters, the 911T/R, and the 911ST of 2.1 to 2.5 liters. The new RSR was a more developed form of Group 4 racers of the newly introduced RS 2.7 Carrera, which was used in Group 3 competition. The new RSR (for Renn Sport Racing) had wider wheels and fenders than its predecessor, with the front measuring 9-inches and the rear being 11 inches wide. It was given bigger torsion bars for the suspension, a front-mounted engine oil cooler, the 'Ducktail' from the RS 2.7, and a slightly enlarged 2.8-liter engine with twin plugs per cylinder and fuel injection. The 300-horsepower powerplant offered 90 more bhp than the RS version.

Throughout the season, the RSR was further developed, gaining even wider wheels (10.5 front and 14-inch wide rears), a more powerful 3.0-liter engine, and coil spring suspension. During the 1973 season, the RSR won the Dayton 24 Hours (Peter Gregg and Hurley Haywood), the Sebring 12 Hours (again, Peter Gregg and Hurley Haywood), and the last International Targa Florio outright (Herbert Muller and Gijs. Van Lennep). The cars did well in the IMSA Camel Trophy in America (Peter Gregg), and dominated the European GT Championship in Europe with Clemens Schickentanz being declared the winner.

For the 1974 season, the customers received what had been its works car specification in 1973, as the factory team had moved on to using the RSR turbo in that year. The RSR used to contest the Group 4 GT class in various countries was built upon the new 'G' type 'short hood' chassis which had the wider wheels, coil springs, and more powerful 3.0-liter engine, with a strong, aluminum crankcase, plus twin ignition and fuel injection, revving to 8,000 RPM. They also had the 'Whaletail' on the engine cover at the rear, an 80% locking limited-slip differential, a remote oil cooler, four-piston 917-type brakes, magnesium center-lock wheels, and a strengthened transaxle with splash lubrication. The G Series bumper shape gave it a unique outward appearance, and its wide front fenders allowed for heat to dissipate from the brakes. In the back, the fenders were widened and were vented both front and rear.

By the start of the 1974 season, the global oil crisis was a major concern, resulting in many teams withdrawing from all competition. BMW and Ford would withdraw at the end of the 1974 season from the European Touring Car Championship (ETCC), leaving the 1975 season to be contested by privateers. For 1974, the Carrera RSR was campaigned as a privateer race car only, powered by the new 3.0-liter Type 911/75 engine, which had been bored out from the 2.7 liter RS motor.

Successes by the Porsche 3.0 RSR during the 1974 GT racing season include victories at Monza, Spa, Nürburgring, and Kyalami. It also captured the IMSA Camel GT Championship, the European Hillclimb Championship, and national championships in Switzerland, Sweden, Holland, and France. In American IMSA GT racing, the RSR Carrera claimed outright victories during the 1974 season at the Road Atlanta Six-Hours, the Mid-Ohio Five-Hours, the Daytona 250 Mile Paul Revere, and the Charlotte 300 Miles.

The RSR would continue to be a competitive and dominant force in GT racing until Porsche introduced their new 934 turbocharged Group 4 contender in 1976, essentially making the RSR obsolete. Nevertheless, the RSR continued to score victories, particularly in the long-distance races and rallies of the times. An RSR won the Daytona 24 Hours outright as late as 1977 and The Tour de France was won outright by an RSR also in that year. As late as 1984, RSRs were regularly seen in the top ten results in races such as the Daytona 24 Hours and the Sebring 12 Hours.

Between 1974 and 1975, Porsche produced approximately 55 examples of the dedicated lightweight racing 3.0 RSRs, with 54 being built with basic road amenities.


by Daniel Vaughan | Feb 2020

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1974 Porsche Carrera RSR 3.0 Vehicle Profiles

1974 Porsche Carrera RSR 3.0 vehicle information
Coupe

Chassis #: 9114609072
1974 Porsche Carrera RSR 3.0 vehicle information
Coupe

Chassis #: 911 460 9110
Engine #: 6840163
1974 Porsche Carrera RSR 3.0 vehicle information
Coupe

Chassis #: 9114609121
1974 Porsche Carrera RSR 3.0 vehicle information
Coupe

Chassis #: 9114609054
Engine #: 6840072
Build #: Prod No: 104 3629
1974 Porsche Carrera RSR 3.0 vehicle information
Coupe

Chassis #: 911 460 9113
Engine #: 684
1974 Porsche Carrera RSR 3.0 vehicle information
Coupe

Chassis #: 9114609073

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