Originally Posted by soccer05
So finished mapping out my front suspension geometry. Very, very happy with my ballpark settings. For those that are interested, on a car with a ride height Of 13.5 inches center of hub to top of fender arch, 2.25 degrees camber, sti front control arms and 18x9.5 et35 rims with 275/35-18 tires, I have a scrub radius of 8 or 12 mm. I will have to check my notes as i dont have my notes on me. This is excellent for steering feel without being so excessive as to cause torque steer. I am going to experiment with some 10mm spacers and see how that affects the steering feels, would still keep me under an inch of scrub, give me slightly more inboard clearance to my fender wells, and widen the track width. When I get back home I will update my measurements so people know where my lateral instant centers are, roll couples, etc. on a similar setup. Very excited, now I need to order some arp extended wheel studs to fit with my spacers.
Before you go chopping up your fenders you're going to want to get baseline ride height measurements with a different location than hub to fender, since your fender will be at a different location when the flares are on.
Once you get the flares on you can confirm your original baseline and do the math against your new hub to fender. This will help with future adjustments and when informing people of your ride height.