I bought a set of 225/50/16 s03 for the rear... then found out they should be 245/45/16, so I bought another set after my OEM fronts wore out.

I'm running 225/50/16 in the front and 245/45/16 in the rear (all potenza s03s)

what alignment recommendations would you have? I don't want to leave it at spec, since tires are not OEM.

(not worried about treadwear too much, handling comes first... but it is a daily driver)

Thanks, Luke

 

Use the UK alignment specs. Same as US but with .5 degree additional negative camber on each wheel.

 

With the wider fronts (225 vs 205) you may need to have a stiffer front bar unless you like the rear loose.

 

These?

 

I think the car will handle better than stock in this configuration but will be much looser in the rear.

I think to cure your new oversteer tendencies I would dial in about -2.5* camber in the rear with .25" toe in for the rear. I would dial in about -1* camber up front since you don't want those to stick too well.

Good luck with this and it should be ideal for street tire auto-xing. I drove several stock S2000's this weekend at a novice school. I found the car too pushy for my tastes. I used to think the car was quite balanced in stock form but I've changed my mind. Keep in mind, auto-x speeds are slower and more "driven" than typical canyon cruising type stuff. I would hope that no one dare reach 10/10ths on the street.

I would recomend doing an auto-x with this set up just so you can learn the limits and break away characteristics of the car since you have made it even more nuetral than stock... and we all know how many people have wrecked their stock S.

 

Are you serious?? What year-model were those cars?
I have a 2001MY with S02's and the only time I had understeer was when it was driver-induced (too much speed on entry) or when my fronts were totally worn out.

The factory alignment has tons of toe-in in the rear (1") to keep the back from sliding, but it contributes to the excessive tire wear we all see on the rears.

Since I did and Autocross alignment, the back end seems to be more controllable and more progressive when loosing or regaining traction. I'll see what happens with tire wear.

 

Yeah, I'm totally serious. Understeer is always driver induced. I guess my expectatations of entry speeds have changed since driving on R compounds. I don't like to drive around understeer. I would rather the car steer and I then have to deal with throttle modulation to control corner behavior. When the fronts slip, there's just nothing you can do about it but slow down... and that's just not sexy.