Corvette Wheels and Tires - C5 Retirement Party

This is the Diablosport Predator for Gen III V-8 powered vehicles which we ordered from Granatelli Motor Sports. On C5s, it plugs in to a data port under the dash near the steering column. It offers numerous tuning and adjusting parameters that should NOT be used by anyone other than an expert with access to a dyno with air/fuel ratio reading capabilities. It also has many features, like the ability to recalibrate a speedometer for gear ratio of tire-size changes, which makes it very worthwhile for any C5 owner who's contemplating minor modifications.

While Tech Center technician Jason Scudellari was loading our coupe's stock program, prior to downloading the Predator "performance flash," we nabbed this shoot that indicates roughly where the data port is located. Part of the connector (arrow) and the cable can be seen trailing down from beneath the dash.

This is a typical display on the Predator. It guides the user, step by step, through the various adjustment parameters it offers and is very user-friendly.

Just for grins we ran before-and-after tests on the Primedia Tech Center's Dynojet to see if the "performance flash" made a measurable difference. It didn't on this essentially stock C5, but modified ignition and fuel curves would probably make a much larger and very measurable one on a Vette with more than just some bolt-on, cat-back exhaust tweaks. Technician Chad Vogele is running the car while Jason Scudellari kicks back-mere inches away from a rear tire and wheel that's being driven on the roller at about 140 mph!