On a bumpy road my car wants to wander all over the place. At higher speeds and trying to brake quickly if I run into any variations in the road the front end goes all over the place and it gets pretty scary. What could be causing this? This has been going on since before all my upgrades but here they are anyway. I have Koni yellows with the eibach & ground control setup. labreck bushings. Brembo big brake kit with 18x10.5 wheels all the way around. RB front swaybar and wfr mounts. I had the alignment checked out a while back but I suspect they didn't know what they were doing. Anyone have any ideas what else I can check.

 

What's your front camber at? Running negative camber is good for cornering, but makes the front end hunt over pavement imperfections and under braking; especially with wide tires.

 

Not sure what it is right now. I'll have to get that checked out. What's a good setup for street/track use?

 

you have alot of front rim width on the front of your car. that's ok but the more you have in front the more precise your front alignment must be. while camber might be a factor it is more likely that the problem alignmentwise is toe. you wouldn't believe, with a 10 inch front wheel, how darty your car would be with 1/8 of an inch of either too much or too little toe. my guess is you are toed out but the car would hunt with too much toe in also. the first item as to setup is tire pressure. i suggest 29 front, 27 rear cold. a good street setup since you have coil-overs would be to run 25 inches of ride height measured at the top of the wheel well lips front and rear. i run 18X8.5 in front and 18X10 rear and have rolled fender lips... once you have set the ride height, set the front camber at 1.5 negative, rear about 1.2 negative. set the toe in front about a hair less than 1/8. ditto rear. track settings should be set using whatever looks good on the pyrometer. one of the cooler things to own is the ART laser toe guage for $300 as it makes setting toe a snap and allows settings to the hundreth of an inch. (my front is .06 toe in.) please let me know how this works for you... obviously there might be other less probable factors as incorrect spring rates, shock settings or a defective shock etc...
howard coleman
//22 full seasons National SCCA racing including a 2nd at the runoffs at Road Atlanta in a tube frame Mazda//

 

Unless you are competing with the car I wouldn't bother with any negative camber; you'll just eat tires quicker.

Otherwise have an alignment done as howard says, but only after you are certain the tire pressures are even on both sides.