Dennis K

I'm running 285/30/18's up front right now w/ 315/30/18's in the rear. Even though my car is mainly a track car, I drive it occasionally on the street.

The traction is great in the dry but wander seems to be dependent on the brand & model of tire. Previously, I was running 285 Pilot Sport Cups and those didn't follow the truck ruts in the highway too badly. But this weekend I was running 285 Hoosier RS303's and holding those in one lane took a lot of concentration. They also made making smooth lane changes rather difficult.

The Cups & Hoosiers are DOT R-compound tires so they're pretty compromised for performance over comfort/ease of use. I think it wouldn't be too bad with a regular street tire but it might require some trial error to find the right one.

Blown Beast

Thanks Dennis, I too am running Michelin pilot sports and that is what I wanted to hear. How is the scrub on those? Will the steering wheel center it's self? What is your front rim dimensions...offset/size/and width?
Thanks Rob

Tim Murphy

Hey Beast, did you get your female metric to 6AN fitting FED EX today? It was unclear if wifey cakes gave the shipper the right instructions.

I run Michelin Pilot PS2 255/35-18 up front and they track great. No wondering at all.

Dennis K

(Disclaimer: My suspension is set up for the race track with low ride height and stiff springs)

Scrub isn't all that much greater than when I was running 8.5" fronts w/ 235's. Steering will center with no problem. With the Pilot Sport Cups, I was running on a 9.5" x 18" Kinesis which had previously been on the Devek white car. I flatspotted one of those so Marc Thomas lent me his latest set of 11"x18" fronts with Hoosiers for this weekend. If I hadn't run them myself, I would have never believed 11" fronts would have fit. As for offsets, well, Marc hasn't divulged them.

The biggest compromise for a street machine will be the loss of steering lock. With the 9.5's, I was down to 2.0 turns lock-lock. Acceptable for street driving but you had plan your U-turns to make sure they weren't too tight. They also made parking in lots with narrow lanes & spaces more difficult. With 11.0's, U-turns are impossible, becoming almost 3 or 4-pt turns. Too hardcore for the street.

Blown Beast

Thanks Dennis, I would like to go to 10in fronts....but did not even think about the turning radius. I am glad to hear that the steering will still self-center.

Tim, Yes I did....Thanks. I am still looking for a way to copy a set of the GT chips for you and will send them to you just as soon as I get them done.