They go all out...the small sports cars (Minis, Sprites, Triumphs, etc) were averaging 80+ mph at VIR, and the bigger displacement cars even faster. An Audi LMP1 car was clocking approx 2 min laps on the full course (3.72m); so, approx 100 mph. They don't push too hard when it comes to overtaking, they tend to wave… Read more
I rode shotgun in a 1971 Corvette race car who got it up to about 150 mph on the back straight. So I'm gonna assume they go all out.