I've seen a few articles on this and was just driving home from a friends when I noticed a slight bump in the rear end when cornering hard. I have a lot of time in this car and have noticed it before but didn't relate. Most of the time I drive this car hard like a (well you know). It doesn't really push in the corners, slight twisting of the front end, but the rear end starts to break loose a little over 70 in some corners. I build engines and transmissions and have little experience setting up suspension.

 

Don't know if I can say it as well as I understand it, but here goes.

Bump steer is when a bump, or movement in the suspension, causes a geometry change in the suspension.

For instance a binding at a certain suspension angle can cause the tires to toe in/out.

This causes one wheel or end of the car to change direction or traction footprint.

Have you ever driven a heavily loaded car/truck and found that a dip or bump in the road causes the vehicle to move left or right? That's because the suspension is out of the normal movement range and you are getting a suspension binding or bump steer.

 

Yup. It's when your rear suspension goes over a bump and changes the toe on the rear tire causing it to turn the car. You'll notice when you go into a turn hard that the rear end turns in slightly too. After the rear end turns in you can add a little more throttle and kick it sideways if you're in the right gear. If you install rear toe rods with heim joints (anti-bumpsteer) you wont have that slight turn in from the rear.

 

sounds like a plan, I had it on the lift today changing oil and noticed a bent right rear control arm.