A closer look at the 2013 SRT Viper GTS-R race car
While most race models in racing classes like the GT class of the American LeMans Series are higher performance versions of production road cars, the 2013 SRT Viper GTS-R is actually tuned and – technically – lower performance than the 2013 SRT Viper that will arrive in showrooms later this summer. The 2013 SRT Viper and Viper GTS that will appear on American roads this summer are powered by an 8.4L V10 that churns out 640 horsepower. Unfortunately for the Viper race teams, the ALMS GT Class has a limit of 5.5 liters and 500 horsepower so the engineers behind the GTS-R from Chrysler Street and Racing Technology group had to meet with ALMS officials to find out what they had to do in order for their V10 powered supercar to be legal to return to the ALMS. The result was cutting the engine from 8.4 to “just” 8.0 liters and adding a sort of restriction system to limit the power output to right around 500 horsepower. While the initial Viper GTS-R race cars that dominated the GT Super Class in 1999 and 2000 had 8.0L V10 engines so they did not have to cut engine volume – even those old school race Vipers had to keep power at 500 with the use of unique race-only components. Ironically, the end result is a race car that is conceivably slower in some circumstances than the street legal road version of the 2013 Viper. Also, this new engine is designed to run on E85 Ethanol; which is a mixture of 85% ethanol and 15% gasoline.