TrackReadyPerformance wrote:how serious are you about building a track car? at my shop thats what we do, build track cars, mostly spec cars, and alot of club racers.
for track, I would go the the base model. I would then add racing brakes, a cuscu or kaaz LSD, along with all needed safty equipment. plan on a set of coilovers, but might not be required depending on your class.
as far as wheels and tires, it depends on your budget, you will need at least 2 sets for a race weekend, this may also depend on your class rules.
if you know what class series you are planning on running in I can look rules up for you, that way you know what you can and can not do
i went with the touring model instead of the track model as I spend far more days on the street than on track, plus I like the heated leather seats in the winter. The cloth seats in the track model do make you slide less. My one regret was not getting the Brembos, which were an option in the touring, I bought mine off the dealer lot at a deep discount. After driving a few Brembo equipped Z's on the track, I'm going to retrofit. As far as tires, I went with 18's. But remember, the larger the wheel the more jarring the ride on the stteet. So if you're planning more street miles than track miles, you might consider the smaller wheels.
I don't think the diffusers are going to make any difference at all except perhaps at certain tracks with long enough straights to get you above 120mph. I can tell you personally the Z is already quite stable at 120+ without them. The big brembo's will let you carry little more speed than the diffusers because you can brake slightly later lap after lap than with the non-Brembo's,
As far as that VSD traction control, I never use it. I turn it off everytime I start it up. You'll find you'll end up fighting it if you forget to turn it off.
Hope that helps.