Reply to "Wheel Alignment spec"

Otis, wheel alignment specs for your car should be whatever causes the machine to handle right for you. Factory alignment values from the U.S or Europe will likely not do this with 16" & 17" tires. This is often done for appearance, not handing. With the sizes indicated, the car will probably understeer badly due to the rear tires being wildly overwidth compared to the fronts. Those 335-35s are an inch wider than what the GR-4 racers used at LeMans on 15" x 14" wheels.... They also are 2" smaller in OD than stock, so the effect on your gearing is something near 4.44:1 rather than stck 4/22:1, so your mileage will suffer & top end will be lower. Your speedo won't read true and acceleration will be enhanced.

To correct most of this, either narrow the rears to 295s or increase the fronts to 245 in order to rebalance the car. Twice the maximum stock caster of -2.6 degrees will help, as will a 1"OD rear swaybar (stock is 3/4"), hollow if possible, with sphereball ends. Less than 50-profile fronts probably will only need 1/8" of toe-in and with a little fiddling, you may find it needs only half that amount. When we redesign Dallara's geometry with big wheels & tires, experimentation must be done to optimize. Good luck.