Bump Steer, what is It and how to fix It?

[BCBCobra]

I hear so much about "Bump Steering" and see the adds for parts, but how do you know what Specs to use to correct it? I have a Street Beast Kit using a 1990 Saleen Mustang with coil over shocks in front. It rides very hard and stiff in front w/o having a sway bar. It does not wander going straight, but it does have a bump when turning on a rough surface. This is my first posting I hope I did it right. Any help or ideas will be appreciated. Thanks, Harold B.

[jberg]

If you drive straight line and car go straight when only one front wheel go over bump you don't have a bumpsteer problem.

So I think that you have some othere problem (like too stiff springs/suspension for rough surface).

More about bumpsteer info http://www.ffcobra.com/FAQ/bumpsteer.html

-jberg

[mdross1]

When the steering linkage angle is off enough,so that when you hit a bump the front wheels move without you moving the steering wheel,you have bump steer.It can be corrected in a couple of ways.The secret is to get the tie rod ends coming out of the rack to be parrallel with the rack, and with the car sitting on the ground.

[mickmate]

This is good reading on MII geometry http://www.heidts.com/support_suspension_101.html

[lovehamr]

If the springs that you are using were intended for a 3500# Mustang with 65% of the weight on the front wheels then they are about 3X to stiff for your 2400# Cobra with 50% of the weight on the front. Might talk to SB and see what they recomend for spring rates.

Steve