Z1 Performance

iTrader: (564)

Posted this in the racing forum, but this is the more appropriate place I think. Now that I am using a grippier street tire, and have had the car aligned, etc, I've noticed what I can only describe as a "shimmy" in the steering wheel immediately preeceding a bump in the road. It varies in intesity with the bump itself, though it never gets incredibly violent. I've never experienced this before, so am unsure exactly how to title it to you guys. From my reading up on a few different sites, it seems bump steer would be the applicable term, but I could be wrong. I do not hear any atypical clunks or noises (having coilovers and stiff walled tires, I have grown somewhat accustomed to these noises, particularly at low speeds). The only odd thing I find regarding this bump is the car has a great alignment on it right now, with about -2 camber, a tinge of toe out and castor that is well within spec. Typically bump steer happens when things are not aligned well.

Tomorrow is oil change time so we are going to give everything up front a once over...but it would help to know where to start if anyone has had a similar issue before

Relative mods: Cusco sway, Cusco coilovers, Cusco a arms, S03's on Work Emotions (18x8.5 +30 with a 5mm spacer) and 245/40/18 S03's at 34 psi.

Thanks in advance!

adam

Kolia

iTrader: (2)

Posted a reply in your other topic

JETPILOT

iTrader: (51)

It's bump steer... caused by a lack of positive caster. It sucks.

Respect
JET

protocav

iTrader: (3)

i think it is the toe out. for the track, toe out is great and will make your car turn in quicker. for the street, there are too many bumps, and the wheel wants to wander, because there is nothing to keep the tires tracking straight. unless you track it every weekend, put some toe in (+) to the tune of .05 degrees on each side.

Chad

Z1 Performance

iTrader: (564)

well, looks like we got it figured out

I knew from the get go the alignment could not be the issue.....the toe out up front is so minimal, its barely worth mentioning

car up in the air, did the wiggle tests and bam...bad inner tie rod end. Hopefully the dealer has one in stock for me tomorrow

Back on the alignment rack we go lol....storry of my life lately

protocav

iTrader: (3)

was there a lot of play in the tie rod end?

Z1 Performance

iTrader: (564)

yep - dealer had the part in stock so hopefully we'll be able to get to it today