Video: ZR750 Ride-Along with John Hennessey
Long known for his prolific output of modified performance vehicles, John Hennessey of Hennessey Performance Engineering took one of their ZR750 modified Corvettes for a rip on the grounds of Lone Star Motorsports Park, in Sealy, Texas.
Starting from a supercharged ZR1 Corvette, the company modified the engine with high flow cylinder heads, an HPE camshaft, high flow air induction, long tube headers with high flow catalytic converters and supercharger modifications to bring the boost level to 13 psi.
The results are an output of 755 HP @ 6,600 RPM and 728 lb-ft torque @ 4,700 RPM, based on using 93 octane fuel. In practical terms, 60 mph is only 2.8 seconds away from a dead stop, while quarter mile performance is 10.3 @ 139 MPH, using the optional Michelin tires. Top speed is said to be 224 MPH, all of which ads up to pretty spectacular performance.
Hennessey takes the ZR750 for a run over the access roads at Lone Star, heading for a couple of high speed runs on the quarter mile track, from the big end to the tower. The exhaust sounds alone in the video are worth the price of admission. If you want to bypass the chit-chat, the action begins around 1:40 into the timeline.