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The Porsche 911 Carrera RSR Turbo was a sports car manufactured by Porsche in the 1970s. It achieved second place in the 24 Hours of Le Mans in 1974.

History
The history of this model dates back to the early 1970s, when Porsche began experimenting with turbocharging in the 911 models. A racing prototype was created so that, if the project succeeded, it could be added to the production model.

The project was carried out between 1973 and 1974, and the car gained fame not only for its incredible mechanics and dynamics but also for its bold shapes and Martini Racing-sponsored livery. Porsche developed a new 2.1-liter engine to comply with regulations, and thanks to its KKK turbocharger, the 6-cylinder Porsche engine developed 500 hp at 7600 rpm. The 5-speed transmission provided greater versatility, being positioned in a transaxle layout.

Characteristics
The 911 RSR Turbo prototype took references from vehicles such as the Porsche 917 Spyder and the previous RSR 3.0. However, after producing four of these vehicles until 1976, the project was closed to focus on other prototypes, such as the 935 "Moby Dick".

Although the chassis was based on the production 911, it included improvements from the RSR and the 917. Some of these improvements included replacing the torsion bar suspension with a set of aluminum arms and new titanium shock absorbers that reduced weight by about 30 kilograms. To meet the weight standard, most of the bodywork was made of fiberglass, and all unnecessary interior elements were removed, and a safety cage was added.

Competition
The result was a weight of 820 kilograms, allowing 0-100 km/h acceleration in under 3 seconds and top speeds exceeding 300 km/h.

In the competitive field, it made its first appearance at the 1000 kilometers of Monza in 1974, where it finished in fifth place. Its most impressive achievement was second place in the 24 Hours of Le Mans that same year.