PROsport Racing has painstakingly redesigned the Porsche Cayman Pro4. The car will be used in the Nürburgring Endurance Series.
In 2015, PROsport Racing developed the Porsche Cayman Pro4. The in-house Cayman-based design was developed by the Wiesemscheid-based team for the GT4 class. In 2016, former DTM driver Peter Terting and veteran Jörg Viebahn won the title in the Pro class of the GT4 European Series. After the 2018 season, the car’s use in the SRO sector ended, but after a few outings on the Nordschleife, it competed in what was then known as the DTM Trophy in 2020 and 2021.
After these outings, the team retained the Porsche for purely emotional reasons. “But over time, the question arose as to whether we could bring the car up to the standard of a current GT4 racer,” explains team principal Chris Esser. “This evolved into a staff project for our young team members, who, whenever they had time, developed the car through various stages every winter.”
The team first installed a new sequential transmission with paddle shift. This alone resulted in a weight saving of 40 kilograms compared to the original PDK transmission, which was installed in the Cayman Pro4 in 2015.
PROsport Racing installed the 3.8-liter engine from a Porsche 911 GT3 Cup (991.1 generation) as the new engine, which develops 460 hp. The traction control and ABS systems of the one-make cup car were also installed – the original car did not have these driving aids, which significantly improved drivability.
The vehicle’s aerodynamics were also refined, with the larger rear spoiler being particularly noticeable. A new front splitter also helps the Cayman Pro4 generate more downforce. The Porsche Cayman Pro4 will also run on wider wheels, for which the rear axle has also been widened.
“The project was very important for our employees, as many mechanics in modern motorsport are no longer really familiar with aspects such as vehicle development, as a large part of current motorsport is customer racing cars. I was very pleased to see how they embraced the project and independently worked out which modifications would best suit the vehicle. In total, we invested approximately €50,000 in the further development of the Cayman Pro4. When I look at the price at which we developed the car in 2015 and have now further developed it, it clearly shows me how expensive GT4 racing has become, and in the end, the cars are only being held back by the balance of performance. I find it remarkable that we could still compete competitively in various racing series with our ten-year-old car, while we are currently no longer allowed to compete in the GT4 European Series with our six-year-old Aston Martin Vantage GT4,” Esser continues.
The team recently completed its first day of testing with the updated Porsche Cayman Pro4 on the Nürburgring GP circuit. “On the same day of testing, we were out with our Aston Martin Vantage GT4 alongside the Cayman Pro4. The same driver was around two seconds faster in the Porsche than in the Aston Martin. The times were roughly halfway between GT4 times and the lap times of the current Porsche 911 GT3 Cup, which were also tested. This makes us very confident. We expect to be able to achieve lap times of 8:20 – 8:25 minutes on the NLS version of the Nürburgring Nordschleife!” concludes Chris Esser.
The Porsche Cayman Pro4 will participate in Friday tests as part of the Nürburgring Endurance Series during the 2025 season. Once these tests are successful, PROsport Racing will also compete in races with the car. The Wiesemscheid-based team will select the drivers at short notice.
PROsport Racing will compete in the KW 6h ADAC Ruhr-Pokal races with its usual Aston Martin Vantage GT4 and the Aston Martin Vantage GT8R. The Aston Martin Vantage GT4 will be driven by Jörg Viebahn, Michel Albers, and ADAC GT Masters race winner Benjamin Hites. Father-and-son team Guido and Maxime Dumarey will pilot the Aston Martin Vantage GT8R in the SP8T class.
