My M4 seems to be sitting lower than it should and noticed rear bump stops are fubar

[rezilient]

After installing Macht Schnell springs the car is sitting much lower than I had imagined. Is this sitting lower than others with MS springs have witnessed or does it mean there might be problem with the install?

Also while lifting the car today I noticed the rear bump stops and dust boot are completely disintegrated on both sides. Aside from replacing the bump stop and boot (not sure how much effort that will be) is that anything to be overly concerned with? Is this a common issue? Can it wait or is this something that needs immediate attention?

Thanks.

[DLag30]

I believe the MS springs come with spacers for the rear springs when installed on a m3. I'd pop those on to compensate for the extra weight the Cabriolet carries. I had MS springs before and the rear height was pretty close the the front height.

[rezilient]

Originally Posted by DLag30

I believe the MS springs come with spacers for the rear springs when installed on a m3. I'd pop those on to compensate for the extra weight the Cabriolet carries. I had MS springs before and the rear height was pretty close the the front height.

Originally Posted by DLag30

I believe the MS springs come with spacers for the rear springs when installed on a m3. I'd pop those on to compensate for the extra weight the Cabriolet carries. I had MS springs before and the rear height was pretty close the the front height.

Ok thanks. Might try that. The guide said to only use it on the M3 so i left them. The spacer is only like 4-5mm so I'm not expecting them to make a huge difference but worth a shot.

Any thoughts about the busted dust cover and whether those are a big deal or just ignore them?

[DLag30]

I would def replace the bumpstops while installing the spacers. The bumpstops play a large role in suspension behavior. There should be a total of 4 spacers for the springs, one sits between the body and the spring cup, and another between the spring cup and the spring/rubber isolator.

[x.shell]

Originally Posted by rezilient

After installing Macht Schnell springs the car is sitting much lower than I had imagined. Is this sitting lower than others with MS springs have witnessed or does it mean there might be problem with the install?

Also while lifting the car today I noticed the rear bump stops and dust boot are completely disintegrated on both sides. Aside from replacing the bump stop and boot (not sure how much effort that will be) is that anything to be overly concerned with? Is this a common issue? Can it wait or is this something that needs immediate attention?





Thanks.

Jeezus. I've never seen bump stops disintegrate like that. It looks disturbingly comical how it's hanging off the dust boot. Yeah, you definitely need to replace those. As DLag30 said, they play a crucial part of the suspension. They act like the last defense by absorbing the kinetic energy of high compression situations that would cause the suspension to bottom out. If they're FUBAR'd like this, you'll feel those hits go directly through the chassis into your butt dyno.