For years, Porsche’s GT4 customer racing programme has been synonymous with the Cayman. From national championships to endurance races around the world, the mid-engined sports car has built a formidable reputation as one of the benchmark machines in the category. Now, Porsche is turning the page on a new chapter.
The German manufacturer has officially unveiled the all-new 911 GT4 R, marking the first time a GT4 customer race car has been based on the legendary 911 platform. Set to make its competitive debut during the 2027 motorsport season, the new machine promises more performance, greater capability and a direct link to Porsche’s flagship GT racing cars.
Rather than developing the car from scratch, Porsche has used the current 911 GT3 Cup racer as its starting point. That means the GT4 R benefits from much of the engineering already proven in one-make racing, while incorporating changes required to meet GT4 regulations.
At the heart of the car sits a naturally aspirated 4.0-litre flat-six engine derived from the road-going 911 GT3. In full race specification, the engine develops up to 513 bhp and 47.9 kgm of torque. However, as with every GT4 machine, output ultimately depends on the championship’s Balance of Performance regulations. Porsche says the car will be delivered with air restrictors that reduce power to 424 bhp, allowing organisers to maintain parity across the grid.
Power is sent to the rear wheels through a six-speed sequential gearbox operated via paddle shifters, paired with a four-disc racing clutch. It is a setup aimed at delivering quick, reliable gear changes while standing up to the demands of endurance racing.
Although the GT4 R borrows heavily from the 911 Cup, Porsche has made several revisions underneath the skin. The suspension features dual-adjustable dampers and three selectable spring rates, giving teams greater freedom to fine-tune the chassis for different circuits and conditions. The wheels are also slightly narrower than those found on the Cup car and use a conventional five-stud mounting system, in line with GT4 regulations.
Aerodynamics have also been carefully considered. The car adopts several body structures from the 911 Cup but incorporates race-specific aerodynamic tweaks, including a manually adjustable rear wing with eleven different settings. Porsche has also embraced sustainable materials, using natural fibre-reinforced composites in components such as the doors, engine cover, aerodynamic elements and sections of the cockpit.
Inside, the focus is entirely on racing. A 10.3-inch colour display keeps drivers informed with critical vehicle data, while an integrated data logger and GPS system help teams analyse performance after every session. The car can also be adjusted to comply with varying Balance of Performance weight requirements through additional ballast.
The introduction of the 911 GT4 R also marks a significant milestone for Porsche’s customer racing programme.
Since entering the GT4 category in 2016, the company has produced more than 1,500 Cayman-based race cars that have gone on to compete in championships around the world. The new 911-based machine doesn’t replace that legacy. Instead, it expands the range by offering customer teams another option at the upper end of GT4 competition.
