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  1. #1
    Join Date
    Apr 2012
    Location
    Lynchburg, Va
    Posts
    249

    Suspension oddity

    I'm running pss10, Turner camber arms rod end, delrin subframe bushings, and solid everything else with a 3 clutch lsd.

    Ive had some clunking and road noise which I've just attributed to the solid bushings. I had the LR wheel bearing replaced because there was some play. That hasn't changed the noise.

    Lately the noise has increased on rough roads, heavy clunking. Then today I noticed that the RR is about 1/4" lower than LR. I pulled the wheels off. Ride height adjustments are at the same level. Camber arms, trailing arms, etc are all secure.

    Thoughts on what's causing the ride height difference?

    Edit: subframe reinforcements were installed w the bushings

  2. #2
    Join Date
    Nov 2016
    Location
    Charlotte, NC
    Posts
    3,130
    Rear strut mount?

  3. #3
    Join Date
    May 2011
    Location
    Charleston SC
    Posts
    6,149
    That would be my guess too... upper shock mount may have punched through.
    Dinan CAI &Throttle body, ESS Tuning TS2, Bimmerbrakes gen3 headers, UUC SSK & DSSR. Achilles oil pump, VAC oil pan baffle
    M3 Motor mounts, UUC Trans mounts, Modified clutch style LSD 3.15, TMS front subframe reinforcement, Koni Yellow sports,
    H&R sport springs,
    UUC sway bars, BMW Perf. Rotors, UUC SS brake lines, Hawk HPS pads, CSL replica wheels,
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  4. #4
    Join Date
    Apr 2012
    Location
    Lynchburg, Va
    Posts
    249
    I'll check the topside tomorrow, but from the bottom. The shock mount looked normal. Pulling that trunk molding out is always an adventure.

  5. #5
    Join Date
    Jan 1970
    Location
    Liberty Township, OH
    Posts
    37,935
    I'll be honest and say 1/4" in ride height isn't hugely unheard of. Do you know there was no delta prior to?

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    Call Me Dane l 2/2004 330i ZHP l 18x8 ET45 BBS CK's wrapped with Michelin Pilot Sport AS3+ @ 245-40-18 l KW V1 Coilovers in front l KW V1 springs w/ Bilstein B8 dampeners in rear l BMW Performance Rotors l UUC StrutBarbarian l Racing Dynamics Rear Strut Bar l Jim Conforti Shark Injector l Light Birch Interior Trim l Bimmian Celly Mount l M3 Trunk Mat l l e90 Performance E-Brake & Shift Knob l M3 Tri-Stitched Boots l AL Headlight Retrofit with ZKW Lenses l CobyWheel Wrap w/M3 Stitching l LCM sw 4.5 triple blink and rear fogs l Maple Interior Trim

  6. #6
    Broken spring, perhaps? Can you upload a video of the noise? You could disconnect the bar and see if the noise remains to start ruling things out.

  7. #7
    Join Date
    Apr 2012
    Location
    Lynchburg, Va
    Posts
    249
    Dane, I don't know where the sheet that had the alignment and ride height went but it was corner balanced with approx my my weight in the drivers seat. I know that lr and rr were essentially the same when we corner balanced because the initial setting was significantly low; about where rr is sitting currently. Also with the spring height adjustments having the same number of threads showing they should be closer than they are.

    I'm lazy so didn't lift the car again but I did pull back the trunk molding and the shock mounts look good. Pulling and pushing on the body didn't yield any movement in the shock mounts. Also there wasn't any motion in the subframe from lifting the rear of the car and setting it on stands.

    No noticeable play in the wheel assembly. Springs are tight in their perches.

    The sound, as best I can describe until I get some audio, is what you usually get from an old hoopdy with worn out struts and the springs aren't dampened at all. Only difference is, mine does that at 2mph with no significant motion in the wheel.

  8. #8
    Join Date
    Nov 2016
    Location
    Charlotte, NC
    Posts
    3,130
    I don't know what the clunking is but the ride height difference definitely makes sense if it was corner balanced with your ass as ballast.

  9. #9
    I'd think the spring rates are sufficiently high that your weight wouldn't cause that much compression from just sitting in the car. Shop could have gotten the ride heights wrong, or perhaps they installed a reinforcement plate on one shock mount but not the other...

    With some creative taping, it's possible to get a video camera (i.e. iphone) focused on the top of the rear shock mounts to see if there is movement there as you drive.

    Did the noise getting worse coincide with colder temps? Just thinking.

  10. #10
    Join Date
    Apr 2012
    Location
    Lynchburg, Va
    Posts
    249
    I had a chance to run the car by the guy who did my suspension refresh. Lr camber arm was loose. Lr wheel bearing nut was loose
    LR Wheel bearing is fucked. That is probably 90% of the noise.

    There may be some uneven... Collapse... Idk the correct word on the rr spring. On lr there are 3 full coils of the spring between the upper and lower perches
    RR is more like 2. It may just be the clocking of the spring. We're going to find a time he can dig in to it and pull both springs out. If the perches have gone to shit he's going to turn new ones out of delrin rather than rubber.

    Then he can fix the shitty way bmw did an alignment. (we had done a string alignment that was exact left and right. BMWs alignment machine had values all over the place and got the alignment values stupidly.)

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