The Girodisc system is a direct replacement for the OE disc on the 991 GT3 and GT3 RS with OEM iron rotors. No modifications are necessary, allows use of factory unmodified pads unlike most aftermarket solutions for this application. The 380mm disc will bolt directly to the car and work with OE calipers perfectly. Once the Girodisc system is in place, just the cast iron rotor section needs to be replaced.
MATERIALS: The central hat section of the rotor is made from strictly U.S. sourced 6061-T6 aircraft specification aluminum. The disc is made from their own proprietary cast iron, poured in the USA and machined from start to finish in house at Girodisc.
The rotor utilizes a curved vane design, developed in racing to act as a centrifugal pump to force cooling air through the disc. The rotor and hat have a floating mount system, which utilizes 8 or 10 high strength alloy steel drive pins, manufactured by Girodisc in the USA to their own specifications and cadmium plated for a long lasting corrosion resistance. These pins take the load from braking actions while maintaining the axial and radial float between the hat and disc. The pins are secured by grade 12 cap screws with hardened washers. In order to keep the rotors from making noise when cold, the pins are mounted with anti-noise spring washers on the rotor side which allow the rotor to grow with heat expansion but eliminate the rattle and noise associated with floating rotors. This float also allows the rotor to self center between the pads.
ABOUT GIRODISC: GiroDisc is guided under the direction of company Principal Martin Meade, who spent five years as an Engineer with Porsche Engineering Services, where he played a role in developing current Porsche technology. Martin began his engineering career working in Aerospace, developing tools and components for special projects. Before working with Porsche, Martin learned a great deal about vehicle design and technologies by working with several vehicle design and development firms. Martin has enlisted help from key sources such as a former Road Testing engineer and Design Engineer for Brembo North America in the High Performance division, Eric Dahl. With lessons learned at Brembo, and experience in prototype and racing car design, Eric has developed a broad spectrum of engineering capabilities in the world of high performance automobiles, and specifically the technologies for developing braking systems. GiroDisc designs and engineers the replacement discs after documenting and studying the OE brake system and specifically the disc design. After analyzing the data and determining how best to maximize the benefit of the new disc, the design process is carried out using 3D CAD-CAE (Computer aided drafting, Computer aided engineering). Prototypes are constructed and tested with a vehicle. When the GiroDisc team is satisfied that the disc will meet the goals established for the vehicle, only then will it be released for sale.
SLOTTED EDGES: The edges of the slots continuously clean and refresh the pad surface. This will allow the pads to have a maximized friction surface always available. Additionally, they prevent contaminants from collecting between the pad and disc interface. The disc is lightened, decreasing its rotational inertia. Slots prevent the formation of a water film on the disc in wet weather, maintaining the best brake response.
SHIPPING: Usually ships same or next business day. Contact us for expedited orders to ensure proper delivery time.