The 1973 Porsche 911 Carrera RSR is one of the most iconic racing cars in Porsche history. Built for FIA Group 4 homologation, it transformed the standard 911 into a lightweight, high-performance track weapon.
In this guide, we break down complete Porsche 911 RSR specs including engine details, horsepower, torque, weight, top speed, and motorsport achievements.
What Is the 1973 Porsche 911 RSR?
The Porsche 911 RSR (Carrera 2.8 RSR) was a factory-built racing version of the 911 developed in 1973. It was designed to compete in international GT racing and quickly became one of the most dominant race cars of its era.
Built in extremely limited numbers, the RSR was lighter, wider, and significantly more powerful than the standard 911 Carrera RS.
1973 Porsche 911 RSR Specifications
Performance & Racing Capability
The 1973 Porsche 911 RSR was engineered for pure motorsport performance. With its lightweight body, widened fenders, and race-tuned flat-six engine, it delivered exceptional agility and speed on the track.
Motorsport Achievements
- IMSA GT Championship wins
- Trans-Am Series victories
- 24 Hours of Daytona class win (1973)
- Strong performance at Le Mans GT category
- European GT Championship dominance
Design & Engineering Highlights
- Widened fiberglass body panels for better aerodynamics
- Lightweight construction for improved power-to-weight ratio
- Race-tuned suspension and braking system
- Rear-engine layout for traction advantage
- Enhanced cooling for endurance racing
Is the Porsche 911 RSR Reliable?
The 911 RSR was designed purely for racing, not daily driving. While mechanically robust for motorsport conditions, it required frequent maintenance and rebuilds depending on racing usage.
Its reliability was excellent for a race car, but it demanded expert-level maintenance and tuning.
Maintenance Notes (Race Use)
- Frequent engine rebuilds after race cycles
- High-performance racing oil required
- Regular gearbox and clutch servicing
- Suspension tuning before each race
- Brake system inspection after events
Frequently Asked Questions (FAQs)
It produces between 280 and 310 horsepower depending on race configuration.
A 2.8L air-cooled flat-six boxer engine.
Approximately 270–286 km/h (168–178 mph).
No, it was built primarily as a racing car for homologation purposes.
Because of its dominance in GT racing and its legendary status in Porsche motorsport history.
Final Thoughts
The 1973 Porsche 911 RSR remains one of the most important race cars ever built by Porsche. Its lightweight design, powerful flat-six engine, and racing dominance cemented its legacy in motorsport history.