Hennessey Performance is once again here to convince you just how powerful their upgrades really are.
Here we have the HPE1000 upgrade for the Chevrolet Corvette ZR1. When it was new, it came with an LT5 supercharged pushrod engine that produced 755 hp and 715 lb-ft at the crank. It was--and still is--a giant killer among supercars, able to produce incredible performance numbers at a fraction of the cost of other supercars.
For most people, 755 horsepower would be more than they’d know what to do with. But not for Hennessey. They know that there’s actually no such thing as too much horsepower, and pushing an already extreme car to the very edge of sanity is the only logical thing to do.
So they took the ZR1 and gave it a few upgrades. Namely, a high-flow air induction system, custom camshaft, ported cylinder headers, as well as upgraded valves, springs, lifters, and pushrods. They also gave it a set of long-tube stainless steel headers, new stainless steel mid-pipes, high-flow catalytic converters, and an upgraded lower pulley system.
This pushed the total crank horsepower to a whopping 1,000 hp and 966 lb-ft of torque. But how many of those horses escape before hitting the rear wheels?
Hennessey naturally needs to find out, and so they put their HPE1000 on the dyno track. After a few minutes of glorious 6.2-L V8 noise, the numbers came back: 905.02 hp and 844.42 lb-ft.
That’s a loss of just 10% total power to the transmission and is pretty good for Hennessey. Compare that to the baseline numbers (which are 654.64 hp and 645.20 lb-ft), and it’s actually more efficient than what Chevy engineers could do with the stock engine and transmission. The cheering you hear at the end of the video is likely in recognition of this fact.
As with most Hennessey products, the HPE1000 comes with a 3-year or 36,000-mile warranty and extensive testing and calibration before you take it home. The ZR1 also comes with a full tank of 93-octane gasoline, which is a very nice touch.