e30 m3 rack bump steer

[mr.vang]

i got an e30 m3 steering rack install to my 318is and now its having bump steer. when ever it hit a bump or uneven pavement it would move the steering wheel. i been reading some info about the swap and most of them say its a direct fit unless its an airbag or non airbag. what can be the cause?

[mr.vang]

anybody

[rThor432]

That's a strange issue.. the E30 M3 rack has the same geometry as the standard E30 rack. It's just a bit quicker, as I'm sure you know. I can't think of anything that could be wrong with the linkage to cause "bump steer". Strange.

[Wh33lhop]

I think it's in your head.

[drumad]

http://store.vacmotorsports.com/vac---e30-m3-roll-center--bump-steer-correction-spacers-p398.aspx

http://www.harrisonmotorsports.com/shop/index.php?main_page=product_info&products_id=1224

http://www.akgmotorsport.com/catalog/catalog.php?category=e30%20Suspension%2FBushings

Random products I ran into when I searched for e30 m3 bumpsteer. Seems to be an issue?


edit: actual info on bumpsteer

http://www.vacmotorsports.com/articlesDetail.php?recordID=3

[rThor432]

Seems to be an issue?

It is an issue on any really low E30. The lower you go, the worse bump steer gets because the tie rods and control arms are at funky angles compared to how the factory intended. The geometry of those components goes crazy when they travel through their "new range" when the car is lowered.

Just changing the rack will not affect bump steer.

[Hellabad]

You are not actually experiencing bumpsteer. You just need to have the car aligned correctly. If you have had it aligned, then you need it realigned.

BMWs are very good, and only need things moved around from stock in extreme circumstances.

[mr.vang]

dam!! thanks for all the good info... glad i asked....