OBX Helical LSD

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  • asubimmer
    R3V OG
    • Jul 2004
    • 6482

    #31
    Originally posted by CarsSuck
    Why not just upgrade to a large case? Won't you be needing it with the turbo anyway?
    yup....I was gonna get a 3.73lsd for $35 and it didn't work out lol
    ///Alpinweiß II 24v 91' 318is, Alpinweiß III 99' 323i, 04' Yamaha R6 SE for sale, 00' VW GTi, 83' El Camino BURNED, 01' P71sold, 92' Miatasold

    Comment

    • matt
      No R3VLimiter
      • Oct 2003
      • 3731

      #32
      Originally posted by Mossman
      anybody have a reason why 325e's and 328i's supposedly have the same diff, yet it's different than e30 and e36 325i's.

      I think I'm gonna guinee pig this but I want to make sure this company knows at least something about BMW fitment before I spend $400.
      Huh? All 6 cylinder e30s and e36s (except euro M3) have the same diff *size* (different case, same LSD will fit, except e36 M3)

      Comment

      • Mr Deagle
        E30 Enthusiast
        • Nov 2006
        • 1121

        #33
        ot, but can you put limited slip clutches in a non lsd case? like is there the provision for it?

        Comment

        • matt
          No R3VLimiter
          • Oct 2003
          • 3731

          #34
          You have to swap the whole differential. The inner part. The cases are the same.

          Comment

          • 325Projectz
            E30 Mastermind
            • Jan 2005
            • 1956

            #35
            Huh, I was looking at these tonight on the bay... Then I run across this thread.

            Well if no one buys one anytime soon, I'd be up for the job, but that won't be for another 2 months or so.
            91 m3

            Comment

            • golde30
              R3V OG
              • Nov 2003
              • 11464

              #36
              OBX Is local to me. i have been to their shop a few times as my buddy buys wholesale from them. maybe i will hitch a ride with him next time and pick their brains about these units.
              IG: @Baye30

              FRONT VALENCE IS ZENDER!!! STOP FILLING MY PM BOX PPL!!!

              Comment

              • 325Projectz
                E30 Mastermind
                • Jan 2005
                • 1956

                #37
                Hitch a ride to their warehouse and put one in your pocket. Report back.
                91 m3

                Comment

                • Jean
                  Moderator
                  • Aug 2006
                  • 18228

                  #38
                  Originally posted by golde30
                  OBX Is local to me. i have been to their shop a few times as my buddy buys wholesale from them. maybe i will hitch a ride with him next time and pick their brains about these units.
                  Do it. I asked a buddy of mine who is heavily into drag racing and said some guys do run them in fwd imports w/o trouble but couldn't get any more info... lame.
                  Mtech1 v8 build thread - https://www.r3vlimited.com/board/sho...d.php?t=413205



                  OEM v8 manual chip or dme - https://www.r3vlimited.com/board/sho....php?p=4938827

                  Comment

                  • ummagawd
                    Advanced Member
                    • Jul 2006
                    • 144

                    #39
                    i'm ready and willing to experiment with this but I have a few hurdles,

                    1 - i have a 92 318ic and thus have the 4.27 open diff... i'm not sure they make one that works...

                    2 - if they do make something (or i somehow get my hands on a medium case 4.1 diff)... i would need someone with the proper tools to install it into the diff (i can install the actual diff itself into the car)

                    and then i can report back my findings... and trust me... i'll try and break it

                    Comment

                    • xLibelle
                      R3VLimited
                      • Aug 2004
                      • 2673

                      #40
                      the regular lsd works just fine

                      though i would love to learn how to service them

                      Comment

                      • matt
                        No R3VLimiter
                        • Oct 2003
                        • 3731

                        #41
                        Originally posted by xLibelle
                        the regular lsd works just fine

                        though i would love to learn how to service them
                        WR has one out of the case... haven't gotten around to messing with it yet. Probably this summer.

                        Comment

                        • DJB
                          Advanced Member
                          • Oct 2005
                          • 195

                          #42
                          Originally posted by xLibelle
                          the regular lsd works just fine

                          though i would love to learn how to service them
                          From what I've read, the key tool to service diffs is a bearing drag measurement tool. You have to tighten the pinion nut until the torque needed to spin the input shaft at 30rpm matches the specified value. That's not a tool that you'll find at your local store.
                          About the only way I can think of quickly making one is combining a battery screwdriver/drill set to 30rpm with a beam-type torque wrench.

                          You'll also need a complete set of shims for both the pinion position and the output flanges. The BMW list price on a "set" isn't cheap, especially if you'll need several sets for each diff.

                          Comment

                          • moatilliatta
                            R3V OG
                            • Feb 2005
                            • 6121

                            #43
                            if you get 80 people to donate 5 dollars each to me... ill try it

                            I was up above it, Now I'm down in it ~ Entropy - A Build thread.
                            @Zakspeed_US

                            Comment

                            • matt
                              No R3VLimiter
                              • Oct 2003
                              • 3731

                              #44
                              Originally posted by DJB
                              From what I've read, the key tool to service diffs is a bearing drag measurement tool. You have to tighten the pinion nut until the torque needed to spin the input shaft at 30rpm matches the specified value. That's not a tool that you'll find at your local store.
                              About the only way I can think of quickly making one is combining a battery screwdriver/drill set to 30rpm with a beam-type torque wrench.

                              You'll also need a complete set of shims for both the pinion position and the output flanges. The BMW list price on a "set" isn't cheap, especially if you'll need several sets for each diff.
                              All you need to measure pinion drag is a fine 0-20in/lbs torque wrench.

                              We always measure rear ends and order the proper shims here at work. I don't think a whole set is needed in stock to setup a diff.

                              I believe he's talking about servicing an LSD unit, not the entire diff itself.

                              Comment

                              • sumyungguy
                                E30 Fanatic
                                • Feb 2007
                                • 1313

                                #45
                                Honda guys have been using them for a while, they haven't had any problems.

                                Theres even a OBX LSD FAQ thread on Honda-tech.. HERE

                                read through it and check out the links...

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