Here is the spec of my gs: 20x9.5 front(-2 camber), 20x10.5(-4 camber), I have fig camber arm(upper&lower), toe arm and trac arm installed, and alignment done, but I still get that bump steer when I hit bumps on the highway. Why it's happening?!?!? do I need to change the outer tie rod then the issue will be fixed? Or is there anything I can do to fix the problem. Since Figs Engineering does not make outer tie rod for the 3rd GS, is Moog tie rod will be ok? Bid thanks!!!

 

What size are your tires? I am thinking may be because your tires may be wider which is why you may experience the feeling of bump steering.

How bad is it?

 

I used to have the swerving with uneven roads. I found out the lower front control are bushings failed, even though it looks good it was bad. It was cheap and super easy to replace.

Also you have a lot of negative chamber. Unless your stanced with that much chamber im sure youll chew up your tires.

 

post pics of your setup..looks like youre running some BBS wheels..

 

I am feeling some type of bump steer as well, I was assuming it was the tires I was running because it does not do it with the factory wheels...

I may have to double check those bushings you speak of. How did you figure out it was the bushings if they looked to be okay? A lot of troubleshooting and removing parts I assume?

 

http://www.ebay.com/itm/LEXUS-OEM-IS...tW6ltO&vxp=mtr

This is the bushing!

When I ran 20's on my awd, I ran -3.5 negative chamber in the rear. The tail end would slip now I run -.5 chamber it handles a lot better.

 

They are stretched. 225/35/20 front and 245/35/20 rear

 

Yes. I'm running 20 BBS LM(Nissan GTR spec) 20x9.5+40 (plus 10mm spacer)and 20x10.5+20 I will post some pictures sometime next week.

 

Thanks for the link. My wheel set up needs to be -2 front and -4 rear otherwise rubbing will be another problem. My car is not slammed, it's about a finger gap, and running with HKS coil.

 

Weird thing is, every time I would check my suspension to see if there is anything wrong, it always crossed my mind that I needed to replace those for some reason, But as you said it never showed any signs of wear upon inspection..THANKS FOR THE LINK! Ordering some right now!

Right now, I am on some 20's as well and my alignment specs show -3.4 in the rear- Pretty close to your 3.5, but it is natural camber from being lowered. I think thats pretty much as far as our stock AWD GS arms go, right?

 

Please do post pics. It would be helpful for me to see what I am working with trying to fit 20x9, and 20x11 rears respectively..

are you on stock camber arms?

 

I have Figs upper arm, Cusco lower arm, Figs toe arm and trac arm

 

Im having a similar issue.

I recently purchased a 2007 Lexus GS450H. the car drives very nice however whenever going on uneven roads i can feel the steering swerving. the car is absolutely stock, it has stock rims on it. however recently it had all 4 struts changed with alignment. as far as alignment is concerned the car drives in a straight line if the road is even, regardless of speed.

from reading this thread im wondering whether my car also has worn out bushings is there anyway to test this?
Also does the steering angle sensor and Yaw sensor have to be reset after suspension overhauls?