Hi,

I have a weird problem and I wanted to see if anyone else had experienced anything similar. I have a 08 528i on which I have installed Eibach Sport Springs and Bilstein sport shocks along with 19" wheels. For some reason it seems like the rear of the car swings out (almost like it wants to Fishtail) when I go over a bump. Has anyone ever had anything like this with their car and if so what did you do to correct it? Thanks.

 

That is not good bro! Does this only happen when going over bumps or even also during turns and or straight driving/braking? Is there some unusual noise coming from the rear of the car?

I have the exact same setup but, with no problems at all. For now I'd rule the suspension out of the question unless there's some kind of wierd noises.

Check to see if they torque the lug bolts to spec on the rear wheels or all the wheels as a matter of fact. With loose lugbolts you may feel as if the car will drift left to right

Torque spec: 88.5 ft lbs. or 120 Nm per manual.

Good luck

 

No. Only when going over bumps. When I drive straight or turn the car feel good. I checked the torque on the wheels and it is correct.

 

Did you get an alignment done after the suspension work was performed? If the car is not tracking straight then you may see issues like this.

 

Yes, a full alignment was done after the wheels and suspension were installed. Could it have something to do with the staggered wheel setup I have?

 

No, wheel stagger has nothing to do with it - both REAR wheels are the same width/diameter I imagine. Either something was done incorrectly in the install, possibly check the sway bar end links, or if the shocks you got are adjustable they were not adjusted equally when installed.

 

Also, there is no noise coming from the rear when this happens. I only feel the shifty/loose feeling after the bump like the rear wants to spin around.

 

This is usually a classic symptom of one of your rear control bushings going bad. Check all your bushings & balljoints for any tearing or movement. If either is bad enough, you should be able to detect movement with the rear end in the air and you trying to move the wheel side to side.

 

Good Point!!! Thanks for the reply. I will check that as soon as I get home.

 

I would check to see if the rear struts were installed correctly