Based on the Corvette ZR1 supercar, the next-generation Corvette C6.R has even stronger links to the production version of America’s performance icon than its predecessors. The GT2 rules require the use of many production-based components, expanding the opportunities for the two-way transfer of technology between the race track and the showroom. The updated Corvette C6.R utilizes the ZR1’s body design, aerodynamic package, aluminum frame and chassis structure, steering system, windshield, and other components. The race team has prepared the cars for the rigors of endurance racing with safety and performance modifications as permitted by the GT2 rules.
Previous versions of the Corvette C5-R and C6.R race cars have dominated the GTS and GT1 categories in the last decade, winning 77 races and eight consecutive ALMS championships. The GT1 Corvettes were retired following Corvette Racing’s sixth victory in the 24 Hours of Le Mans on June 14, 2009.
The upcoming GT regulations required a comprehensive redesign of the Corvette C6.R package. In place of the GT1 Corvette’s steel frame, the GT2 version utilizes the production ZR1’s hydroformed aluminum frame as the foundation for a fully integrated tubular steel safety cage. The GT1 version’s wide, louvered fenders are replaced by production-based ZR1 fenders with wheel flares. In accordance with the aerodynamic regulations, the rear wing is reduced 25 percent in width, the diffuser is a flat panel without fences or strakes, and the splitter extends only as far as its production ZR1 counterpart. Steel brake rotors have replaced the carbon discs used previously, and the wheels are aluminum instead of magnesium. The adjustable steering column and steering rack are sourced from the street Corvette.
In the remaining races in 2009, the Corvette race cars will be powered by 6.0-liter GM small-block V8s that are based on the 7.0-liter LS7.R that powered the GT1 version. This reduction in displacement was achieved by shortening the crankshaft stroke from 3.875-inch to 3.32-inch. The diameter of the series-mandated intake air restrictors was decreased from 30.6 mm to 28.6 mm, with a corresponding reduction in engine output from 590 to 470 horsepower. A 5.5-liter production-based GM small-block V8 is currently under development and will be introduced at the start of the 2010 season. The Corvette Racing team is continuing its commitment to green racing with the use of E85R ethanol racing fuel.
While much of the hardware has changed, Corvette Racing’s roster of championship-winning drivers remains the same. Johnny O’Connell and Jan Magnussen will share the No. 3 Compuware Corvette C6.R, and Oliver Gavin and Olivier Beretta will drive the No. 4 Compuware Corvette C6. R. They will be joined by Antonio Garcia and Marcel Fassler at Petit Le Mans.
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