Rear shock mounts

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  • Skafrog
    E30 Mastermind
    • Oct 2003
    • 1730
    #1

    Rear shock mounts

    Hey, I got a theoretical question.
    I know that whenever you lower your car on sport suspension, it causes the rear shock mounts to be under more stress, and the often break.
    The question is, would installing a rear strut bar help out that situation by linking the two sides together?

    NASA MidSouth TT Director / GTS2 #018
    Mods: Coastal PS Fluid, 10w40 Oil
    Future Mods: Bosch Micro-Edge Wiper Blades, Painter's Tape, Spark Plugs, Freezer for Nutty Buddys, Adam Nitti CD's
    Tags: None
    • EVOIIIM3
      Grease Monkey
      • Oct 2003
      • 315
      #2
      Nope, the RSM break under stock suspension also.

      A rear shock brace does nothing on the E30, our towers only see up and down loads, not side loads.

      What will help is getting the E46 M3 cab rear mounts, or the Ground Control ones, then get some Z3 rings to install on the top to help distribute the pressure over the whole mount.

        Comment

        • Jon325i
          R3V OG
          • Oct 2003
          • 6934
          #3
          What will help is getting the E46 M3 cab rear mounts, or the Ground Control ones, then get some Z3 rings to install on the top to help distribute the pressure over the whole mount.
          I have E36 M3 Cabrio RSMs (virtually identical to the E46 counterpart) with the Z3 reinforcement plates and its held up quite well. Only mistake I made was I purchased these items from my local stealer. Next time I'll seek a cheaper alternative.

          Jon
          Rides...
          1991 325i - sold :(
          2004 2WD Frontier King Cab

          RIP #17 Jules Bianchi

            Comment

            • MattM20
              Mod Crazy
              • Oct 2003
              • 641
              #4
              the rear strut brace will help absorb impact heading for the shock mounts, since a good deal of force is on rebound (pulling down on the shock tower). which is also the purpose of the Z3 reinforcement plates.

                Comment

                • Jand3rson
                  Banned
                  • Oct 2003
                  • 37587
                  #5
                  Bumping a WAY old thread...

                  Originally posted by Jon325i
                  I have E36 M3 Cabrio RSMs (virtually identical to the E46 counterpart) with the Z3 reinforcement plates and its held up quite well. Only mistake I made was I purchased these items from my local stealer. Next time I'll seek a cheaper alternative.
                  I'm looking to buy the E46 M3 rear shock mounts and Z3 plates for my car here pretty soon, where's the best place to get them from? BMA doesn't list the E46 M3 cabrio. Are the coupe RSM's the same as the cabrio?

                    Comment

                    • AlpineIS
                      Advanced Member
                      • Aug 2006
                      • 161
                      #6
                      It appears they are the same

                      Coupe:
                      http://www.realoem.com/bmw/showparts...25&hg=33&fg=45

                      Vert:
                      http://www.realoem.com/bmw/showparts...41&hg=33&fg=45

                        Comment

                        • matt
                          No R3VLimiter
                          • Oct 2003
                          • 3731
                          #7
                          And to correct a misconception in the first post... lowering the suspension doesn't have anything to do with how quickly the RSMs break (unless the shocks bottom out), but stiffer shocks do.

                            Comment

                            • ptownTSI
                              E30 Fanatic
                              • Jun 2005
                              • 1265
                              #8
                              should i get the Z3 rings if i put the repair shop (JTD) mounts on?

                                Comment

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