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I had 17" X 9" Borbet wheels on my Z when I first got it almost 5 years ago. I used them because I already had them from my Stealth and they fit. They have since been replaced by 18" wheels. I think the 17's were on for about 6 months.
I run my car on the track with the same equipment I run on the street. 17" wheels not only save alot of weight (they only weigh about 15lbs each) they also save a lot of money when it's time to buy tires. (I go through two full sets per year.)
17's are definetly NOT the best choice for the track. 355mm rotors won't fit under most 17's. The 355 rotors are a big step up in performance from the 335/328 rotors. For autocrossing 17's are ok.
Most hardcore track guys dont run 18's not because of weight but because if you price tires for 17 to 18 there is a substantial difference.
RPO model 1's
+1...there's a big cost difference! (I only switched to 18's this yr b/c I was looking for some very specific rim/tires combinations that I could only find in 18's)
17 inch tires can be heavier than 18s!! as can rims! it's very odd, I know.
yep. Lots of time the 17's have a higher aspect ratio than the 18's...usually the total diameter of either a 17 or 18" rim/tire combination ends up being the same. (so you might get a lighter 17" rim, but the weight is just shifted to the tire)