Tips for improving high speed stability?

[motorollow]

I should have stated highway speeds and up. My car gets there fairly quick.

I'm starting to think its time for some higher offset 15x8's.

Yep, there is a reason why the 15x8 6ULs have the offset they do.

[wizzurp]

I think you've hit the nail on the head all by yourself.





The problem is the wheels - more specifically, the problem is with the extreme change in wheel offset. You've fucked up the scrub radius (made it significantly more positive) on the car. That's why it feels okay on smoother roads, but the front wheels want to jerk the wheel out of your hands on bumpier roads.

Here's a couple of good links that give a basic explanation of steering angle inclination and scrub radius, and the effect of wheel offset on both:

Link 1

Link 2

Thanks for those articles, they have a good explanation. When I get off today I'm going to pick up some stockers and see how they feel up front!

[wizzurp]

Picked up a pair of stock hollow spoke wheels with some t1r's, threw them on the front. God dammit, it feels so nice now. Solid as shit, isn't remotely twitchy, etc.

And these wheels are going to be sold today.

Fuck. Thanks so much guys, this thing is going to be so mean.

[altiain]

Glad I could help.

[wizzurp]

And those wheels are sold! Anyone have a decent set of 15x7's or 15x8's they want to sell?