In Grand-Am we were forced to run the wheel and tire combination offered, and couldn’t pick and choose to get the rolling radius the NSX came with. In our testing, this caused the NSX to have two problems; 1) with the larger front tire, we couldn’t get down to OE or GAC legal ride height. Bringing the center of gravity as low as possible is an enormous advantage. 2) our ABS works by monitoring individual wheels, and when a differentiation of a certain percentage is recorded, the ABS kicks in… so if you already start off with a different then OE front to rear wheel ratio, then your closer to that threshold and your ABS wont work properly. Couple that with the different expected/programmed braking pressures (From the race pads), and you have a useless ABS system, in fact it may even hurt your potential performance, or even be dangerous. We went to Barber Motorsport Park with 15” GAC rims and tires from the touring car class, to test our theories (They happen to be the same height as OE)… Wow what a difference, Pete Halsmer made the request with the series and got them approved for us.
Hope to see more NSX’ers at Mid-Ohio August 6th to 8th.
Hope to see more NSX’ers at Mid-Ohio August 6th to 8th.
Unfortunately the GAC wont yet allow us to run aftermarket brakes. Up front we run a Cobalt Friction Spec VR compound with less initial bite, and good consistent heat numbers. 
I like your front shock tower brace(or is that what is under my plastic shrouding as well?),and moton placement.Youre right about that 225/45/17 tire quite tall,esp with a lowered car.
