Hennessey-tuned Corvette ZR1 Makes 1,139 Rear Wheel Horsepower
Corvette ZR1 with a camshaft, headers, pulleys, ported heads and a ported blower makes nearly double the stock power.
Since the engine computer system of the C7 Corvette ZR1’s LT5 was unlocked, we have seen lots of shops making big numbers. Many of those big numbers have come from the crew at Hennessey Performance and in the video above from the Texas tuner’s official YouTube channel, we get to experience the capabilities of their HPE1200 package for the new ZR1.
In most cases, the Hennessey engine packages are named after the power levels at the crankshaft, but the HPE1200 package for the new Corvette ZR1 makes nearly 1,200 horsepower at the rear wheels.
HPE1200 Corvette ZR1
In stock form, the new Corvette ZR1 packs 755 horsepower from the supercharged 6.2-liter LT5, leading to 619.19 rear wheel horsepower and 634.42 lb-ft of rear wheel torque.
The HPE1200 package for the new ZR1 adds a Hennessey camshaft, ported cylinder heads, a ported supercharger, new upper and lower pulleys, a larger throttle body, a high-flow induction setup, long-tune headers, stainless steel exhaust and upgraded cylinder head components, including the springs, retainers, pushrods, lifters and valves. Hennessey notes that the HPE1200 package requires race gas, but in the video above, it is tuned to run on an E85 alcohol blend.
Finally, in cars equipped with the 8-speed automatic transmission, Hennessey requires an “upgrade”, but there are no details as to what kinds of upgrades are performed on the self-shifting transmission at work in this video.
In the video above, we get to watch as a gorgeous new Corvette ZR1 with the Hennessey HPE1200 package makes a hard pull on the dynamometer. We get to enjoy several angles, including one with an inset clip of the gauge cluster, showing us that the transmission is in fifth gear for the big pull and on that run, the car hit 175 miles per hour.
More importantly, the HPE1200 kit lifted the horsepower level at the wheels up to 1,139.16 while the torque climbed to 994.39. That is a gain of 519.97 horsepower and 359.97 lb-ft of torque at the rear wheels, so it is about 100 horsepower short of doubling the stock output.
Of course, the cammed LT5 with the worked heads, blower and aftermarket exhaust bit sounds the part of a Corvette with almost 1,200 wheel horsepower, so crank up your speakers and enjoy!