11" wide is wheel and 315 wide tire is max allowed in STU so that's why I'm looking to see if anyone actually runs them in STU. The 285's on 10.5 wheels are quite popular for the 350Z. I'm not suggesting that the taller tire is right for STU or everyone who tracks. I just know that it's right for me on my home track. I ran a few combinations on my 350Z and when I switched to the 285/30/18 from the 265/35/19 it cost me 8 mph and made for some uncomfortable shift points. With this car and the 285/30/19's the shift points are ideal. I don't have to upshift to 4th heading into 10, I'm just hitting the rev limiter in 4th heading into 16 and 1. Might well be totally wrong on another track, but ideal for me on mine. Gear changes aren't allowed in either of the classes I run the car except the update/backdate that would allow me to run the 3.916 which would be counterproductive. I run SCCA events, sound like you run NASA events, and with a turbo you're clearly in less restrictive classes than I run.
So you run the +16 and +18 (no spacers i assume) 11" wide wheels up front with no rubbing? Fenders rolled or cut? Since you clearly aren't running STU where a roll is legal but a cut or flare isn't I have to ask. Also how much camber are you running?
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