Hennessey Performance is widely known for adding crazy amounts of horsepower to factory fresh vehicles already laded with respectable amounts of horsepower. This Corvette Stingray Z51 is no exception. Coming from Bowling Green with 460 horses and 465 pound feet of torque under the hood, this C7 gets a generous power increase thanks to Hennessey’s HPE650 Supercharger upgrade.
The specialized kit includes a high-flow supercharger with Hennessey’s HPE air induction system, a custom pulley for the blower, an upgraded 160-degree thermostat, and specific recalibration of the car’s engine management system. The extra air forced down the 6.2-liter V-8’s throat helps produce 650 horsepower at 6,300 rpm at the flywheel.
On the dyno, the car turns in 532 horsepower and 539 pound-feet of torque at the rear wheels. That’s an increase of 72 horses and 74 pound-feet compared to Chevrolet’s performance output numbers. Compare them to Hennessey’s baseline dyno results of the stock C7, and the difference is even greater. The stock car only put down 399 horses and 400 pound-feet to the rear wheels — though with its dealer license tag still tapped on, it’s possible the car wasn’t broken in.
Compare Hennessey’s before and after numbers, and the Vette gains an extra 133 horsepower and 139 pound-feet of torque at the rear wheels. Impressive stuff.
Also added to the car are several Hennessey badges, premium floormats, carbon fiber doorsills, and Hennessey’s 3-year, 36,000-mile limited warranty. The Texas-based company also offers plenty of other interior and exterior accessories with the package, at a slight extra cost.
If you find yourself wanting a Corvette Stingray HPE650, you’d better act fast. The company is only building 100 examples for the 2014 model year, though more will likely be available for 2015 and beyond.