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Bcomp’s (Fribourg, Switzerland) long-standing collaborating with German motorsport team Four Motors and (Mannheim, Germany) is coming to fruition, with the launch of the Four Motors Porsche GT3 Cup vehicle at 2025 Nürburgring 24 Hours. The race car will use exterior body components produced with Bcomp’s gray ampliTex natural fiber.

The development builds on previous projects with Porsche Motorsport, including the Porsche 718 Cayman GT4 CS, Porsche 718 GT4 RS Clubsport and Porsche Mission R. “These new processes allow us to deliver a new look for natural fiber composites that is not only high-performing, but also road-relevant,” says Ken Kruck, sales representative motorsports at Bcomp.

The Bcomp gray tone showcases how natural materials can be tailored to blend seamlessly with high-performance design, beyond the natural gold-brown appearance of flax fibers seen in earlier models. Road relevance is further reinforced by painted surface on the exterior parts, rather than the foil typically used in race components. While adhesive films (foils) are used to enable rapid design changes, the use of paint further demonstrates the feasibility of natural fiber composites in high-performance road cars.

The hood, rear wing end plates and front bumper dive planes of this year’s Four Motors Porsche GT3 Cup car have been reverse engineered by Bcomp, now comprising colored ampliTex fabrics compared to the previously used aluminum and carbon fiber. According to Bcomp, when produced in an autoclave in combination with its powerRibs offering, natural fiber parts can achieve an equivalent stiffness and weight to carbon fiber components. They also meet — and even surpass — the same high safety and quality standards, offering 250% better vibration damping and improved crash behavior.

The Nürburgring Nordschleife, often referred to as the “Green Hell,” offers an ideal environment for validating these materials under extreme real-world conditions. “These findings will be incorporated into future products,” says Matthias Scholz, director GT Racecars at Porsche Motorsport.