Musashi,
Yes, I'm new to the track, but the demo driver was a pro and he certainly was not. He was smoking past cars that had at least a 100hp advantage over the Z he was driving...the man knows how to handle a sportscar.
That being said, I think Semtex has hit it on the head. The Z the pro was driving had Hoosiers on it. Comparing my track experience to those I've had with VDC on the street, it seems that VDC is very intolerant of rear wheel spin but extremely tolerant of sideways slip. Thus, the pro could aggressively throw the Z into a corner and rotate the car around without any VDC limitation. I don't think the stock Z had enough power to spin the Hoosiers coming out of a corner in 3rd or 4th gear given that the demo driver was a seasoned veteran and applied the power appropriately as he unwound the wheel.
The times I noticed VDC on the track were when I jumped on the throttle coming out of a corner. I was probably already near the limits of my traction with regard to the turn and didn't have the grip to then be applying heavy throttle. When you complain that VDC is limiting your power coming out of a corner, the alternative would be you spinning your tires. I'm not sure how spinning the rears as you exit a corner is going to make you go any faster.
I do understand the street scenario of jumping across traffic. VDC seems to behave differently depending on how abruptly you engage it. Thus, hammering the throttle from stop on the street, it cuts power severely. Getting on the throttle to hard coming out of a corner on the track, the VDC only adjusts the throttle slightly.
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