Announcement

Collapse
No announcement yet.

Rhythmic vibration at 70mph+

Collapse
X
 
  • Filter
  • Time
  • Show
Clear All
new posts

    Rhythmic vibration at 70mph+

    Having a weird vibration problem at 70mph+, tried taking it up to 95mph and only got worse with speed.

    With the car in neutral the vibration is still there, with brakes applied it still there, no weird grinding noises, turning has no effect.

    Tried swapping rims/tires with known good; same problem.

    Checked that all calipers, tierods, control arms, shocks, etc were all tight.

    Drive shaft is new (OEM BMW), all wheel bearings are new (FAG), all suspension components (including all rubber bushings) are less then 2 years old.

    Even while holding speed the vibration seems to get slightly better then slightly worse, rinse and repeat; in a rhythmic way.

    Very hard to tell if its coming from behind or in front.

    Any ideas?
    Your resource to do-it-yourself and interesting bmw and e30 stuff: www.rtsauto.com

    Your resource to tools and tips: www.rtstools.com

    #2
    CSB preloaded or driveshaft angle incorrect?

    But if its doing it in neutral then maybe you lost a wheel weight?
    Never argue with stupid people, they will drag you down to their level and beat you with experience. -Mark Twain

    Comment


      #3
      I thought of a wheel weight but if he's still at highway speed when he puts it in neutral,it could still be the drive shaft as you suggest. It's just being driven by the diff and loaded in the opposite direction.

      What was the last thing you replaced before you noticed the vibration ?
      Seat Shocks....I have passed the baton to John Christy from Ninestitch. Email John or Garrett at ninestitch1@gmail.com

      https://www.r3vlimited.com/board/sho...86#post4944786
      Alice the Time Capsule
      http://www.r3vlimited.com/board/showthread.php?t=360504
      87 Zinno Cabrio barn find 98k and still smells like a barn. Build thread http://www.r3vlimited.com/board/show...20#post3455220

      Comment


        #4
        Check and see if you are "dog legging". Have someone drive behind you and have them check if your driver's or passengers side is more visible while directly behind you. A rear arm may be bent and the vibration is from the car trying to keep itself straight. If it gets bad enough, you may eventually feel a slight bounce also.

        Your driveshaft will also keep rotating when you put it in neutral, but it will no longer have load on it. So don't rule out a driveshaft component problem.


        ATTENTION:

        FOR THOSE WHO HAVE NOT DONE SO, PLEASE DO SO AT THIS TIME

        Comment


          #5
          I store the car during the winter and often do a bunch of work, so its often hard to pinpoint one thing I have changed to check.

          However, I noticed some steering wheel shake and decided to point my focus to the front end.

          My steering rack seems to have some movement which I have captured here (recommend to watch with sound):



          Can someone check their rack and see how much movement theirs has behind the inner tierod balljoint?
          Last edited by noid; 05-22-2016, 05:50 PM.
          Your resource to do-it-yourself and interesting bmw and e30 stuff: www.rtsauto.com

          Your resource to tools and tips: www.rtstools.com

          Comment

          Working...
          X