Development
Having already established the C5-R as a winning car, the development of the C6.R was more of an evolution of a design rather than an all new car which required long periods of testing and design. Pratt & Miller's process was aided by the fact that, unlike the C5-R which debuted several years after the C5 generation Corvette was on the streets, the C6.R and C6 generation Corvettes would be developed at the same time. This meant that design elements which would help the race car could be adapted to the road car, allowing the C6.R to use more exotic design features but still meet homologation requirements. In turn, this meant racing elements could be adapted to the Corvette Z06 performance car, which the C6.R shares it exterior styling with.
Much of the framework of the road legal C6 was retained on the C6.R, leading to increased use of weight-saving aluminium. The road car would also replace the C5's pop-up headlamps with permanent designs integrated into the bodywork. This meant that the racing car would have better air flow over the front of the car, doing away with their replacements for the pop-up headlamps which stuck out of the bodywork. The large grill opening on the car would also serve to eliminate the variety of openings on the C5-R to feed not only the brake cooling ducts, but also help with downforce by exiting back out the top of the bonnet.
Underneath, the C6.R retained much of the mechanical elements from the C5-R. The same Katech-built 7.0 litre V8 was used, but more closely based on the LS7 from the Z06. This engine, known as the LS7.R, would go on to earn the Global Motorsports Engine of the Year award in 2006 for its performance and endurance capabilities. Like the C5-R, the C6.R lacked a rear window due to structural framework and fuel tanks taking up the space behind the cockpit. However, an innovation on the C6.R was the addition of a small video camera into the rear bumper, and a monitor placed on the roof of the cockpit. This allowed the drivers a better view behind them, instead of having to rely on their side mirrors.
Another innovation was the use of an air conditioning system in the car in order to help drivers better endure high cockpit temperatures. This required the addition of a large suction fan to the rear of the car, as well as intakes integrated into the side mirrors. One innovation which the C6.R debuted in 2007 was the use of variable displacement. This system would disable half of the cylinders in the engine during caution periods in order to increase fuel economy when speed was not important. Although the system was tested during the season, its failure at the 2007 24 Hours of Le Mans led the team to remove it from the cars until it could be further evaluated.
As of the end of the 2007 season, six C6.Rs had been built by Pratt & Miller. A seventh car, used for development work, was actually built on a C5-R chassis but adapted to carry C6.R bodywork. This car has never raced and is used merely as a show car, making its public debut alongside the C6 Corvette at the 2005 North American International Auto Show.
Read more about this topic: Chevrolet Corvette C6.R
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