By Patrick Rall
With any high performance vehicle, its arrival on the streets inevitably means that someone is going to verify advertised power with a dyno run but with the 2013 SRT Viper – Chrysler did the work for us. Last month, the folks from the SRT brand took a new Viper to Livernois Motorsports near Detroit for a dyno session in an impartial setting. To show that the new Viper does indeed offer the impressive levels of power, the company has issued a video showing the car on the dyno and the ensuing dyno sheet complete with some awesome power numbers.
Hosting this video is Erich Heuschele, SRT Vehicle Dynamics Engineer and Dick Winkles, SRT Viper Powetrain Manager, who made the trip to Livernois with a Pitch Black 2013 SRT Viper GTS sporting the same production engine calibration that is offered on those models currently arriving at dealerships around the country.
After a short blast on the dyno, we see a readout sheet for the 2013 SRT Viper showing 557.12 horsepower and 524.12lb-ft of torque at the wheels. For those of you wondering what happened to the 640 horsepower and 600lb-ft of torque advertised, the numbers on the dyno are stated in actual horsepower at the ground while the advertised power figures are what the engine makes at the transmission. In the case of most rear wheel drive cars, we expect around a 15% loss between stated (at the transmission) power numbers and what the car actually puts to the ground. A 15% loss on 640hp and 600lb-ft of torque would amount to 544 horsepower and 510lb-ft of torque to the Viper is technically more efficient than many modern rear wheel drive vehicles… or it makes more than the advertised power at the transmission. Based on the advertised figures, the new Viper has a drivetrain loss of roughly 12.9%. For the record, I have had the chance to watch several dyno runs at Livernois Motorsports and while some dyno shops are accused of reading a bit high, the Livernois dyno is one known to read true so we know that these numbers are very legitimate.
At the end of the video, the folks from SRT are good enough to remind us all that with 557 wheel horsepower and 524 wheel torque – the 2013 SRT Viper is the most powerful naturally aspirated production car in the world.