Re: Will Z06 hold on race track?
I agree with comments above. In addition to upgrading brakes (rotors and pads and lines and using a high temp fluid) - you need to pay close attention to tire pressures. It has a huge effect on grip. I like Michelin Pilot Super Sports, and I use a very accurate digital gauge and a pyrometer to check the temps. That helps me to know whether the pressure is too high or low.
A 5 or 6 point harness also makes a huge difference because you become "one" with the car. Instead of holding on and spending energy bracing - you now focus solely on driving the car, and your "seat of the pants" feel is magnified because you are connected to the car in a way that a 3 point seat belt just can't deliver.
I've had my 09 Z06 at Mid-Ohio, Pocono, Watkins Glen, Road America and PittRace. I hope to add Road Atlanta and V.I.R. this year. They are amazing performance values and stick like crazy. I agree that most people will discover their personal limit before that of the car - but only if brakes are upgraded. The stock brakes don't hold up well for repeated track sessions. I've seen plenty of vettes go home early cause their stock brakes overheated.
I also agree that instruction is key. I've had many laps and hours with some great instructors, and any time I visit a new track (even though I'm solo status at several tracks and an instructor at my home track) I ALWAYS ask for an instructor - or an experienced driver to ride with me and show me the line and orient me to the track. It makes a big difference in my ability to enjoy the track and I learn it much quicker with orientation. I also watch videos before I go - that helps to shorten the learning curve (especially on longer, somewhat complex road courses).