I'm looking to replace my current tires at some point in the next year with some more track oriented tires ( Hankook, Toyo's, , etc) I have Sport Designs wheels with 285/30 -18 and 225/40-18 Sumitomos now. It seems to me that this set up is more prone to understeer then the stock 265/225 set up. I don;t hthnk I can get wider tires in the front to fit. So it the better set up 265/225 for the track?

 

Why do you think it's more prone to understeer?

 

Because in any car when you increase the width in the rear , providing more traction it will allow more power to push the car forward. With the front tire still being the stock width there is less available traction, thus this will will induce under-steer. If I either reduce the rear width or increase the front width this will reduce under-steer. In a Porsche with more of the cars weight over the rear the front is more prone to under-steer anyway.

I'm hoping that I can increase the width in the front to a 235 or even a 245 with out fender inference. that way I can keep the 285's in the rear a minimise the under-steer. I'm taking my car to the tack in the next two weeks so I will see just how back this issues is. I want to be some stickers tires but I would like to have the car a balanced as possible and not have to correct it with suspension changes. Or at least big changes anyway ( i.e. different springs, sway bars).