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Dec 06 - Playboy Racing

Nissan 350Z Hal Prewitt will be driving with Playboy Racing for the 2007 Grand-AM Cup and Rolex Race Series. First race is the Rolex 24 hours of Daytona on Jan 27-28, 2007.

The team will be fielding four Nissan 350Zs in Grand-Am this season. Two are built for the GS (Grand Sport) class (Specifications) and will compete in the 2007 Grand-Am KONI Challenge Series. The other two are new design Race prepared and tuned by Unitech Racing, Inc and will be making their first appearance in the Rolex Sports Car Series racing in the GT division. Specifications for the GT class Nissan 350Z and team drivers will be announced later in the month.

GT Class - Rolex Series

The Rolex Sports Car Series GT division is home to production-based race cars that are similar in appearance to the latest high-performance sports cars and coupes that are found on the street every day. Underneath their skin, however, GT race cars are all business and use some of the same technology found in the more exotic Daytona Prototype class.

The rules for GT-short for Grand Touring-employ several methods of equalization, including race car weight, tire size and engine RPM limits to provide an even playing field for a variety of international and American-made cars.

Engines in GT machine produce between 390 and 450 horsepower depending on the car, and minimum weights range from 2,500 to 2,700 lbs. The popular Porsche GT3s and BMW M3s-two championship-winning models in GT over the years-weigh-in at 2,600 to 2,700 lbs., while the bigger Corvettes tip the scales at the maximum 2,700 lbs. Top speed for GT race cars is 170 mph

GRAND SPORT (GS) Grand-Am Koni Challenge Series

For 2007, the Grand-Am Cup Series has been renamed the Koni Challenge. It is the showcase for the latest in high-performance sports cars, coupes and sedans straight from the dealer showroom floor. With major modifications permitted only in the area of safety, the series is home to the same cars seen on streets and highways around the world every day.

All Grand-Am Cup classes run on Hoosier tires and at least two drivers must drive in each competing race car under green flag conditions, making at least one driver change mandatory. The GS (Grand Sport) class is made up of several factory sports and muscle cars from around the world with minimal performance modifications but full safety systems. Minimum weights range from 2,730 lbs for the Acura NSX to 3,250 lbs for the big Cadillac CTS-V.

Engines are tuned to produce between 350 and 405 horsepower depending on the car, and the competition is further equalized by a variety of fuel tank capacities that range from 16.5 gallons for the Porsche 966 to 20 gallons for the Acura NSX, Audi S4, Cadillac CTS-V, Lotus Esprit, Chevy Camaro, Pontiac Firebird and all Ford Mustangs. Top speed for most GS cars is 160 mph.

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