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For those who want to refresh their factory LSD.

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    For those who want to refresh their factory LSD.

    So I decided to tear my 3.73LSD apart while my car is in the garage for winter.

    I work with a guy who builds Porsche race cars and while I was pulling apart the LSD carrier, he started to recognize some of the parts. It turns out that the LSD unit shares almost all its internal parts with the one Porsche uses, which is made by ZF. And all of those parts are still available.

    Here's all the part numbers:
    http://www.autoatlanta.com/porsche-p...-91/305-05.php

    "Disc with external splines" is available in different thicknesses to adjust preload. The stock discs in my diff were 2.0 mm thick and I replaced them with 2.1 mm discs and new friction discs.

    I won't be able to test it out for a few months, but I'm expecting at least like-new performance- hopefully slightly more agressive lock-up due to the increased carrier preload.
    '91 318is
    sigpic

    #2
    hmm does that mean you cant get the parts from bmw?
    Renting my rear wheel bearing tool kit. SIR
    http://i25.photobucket.com/albums/c5...ps6debf0b0.jpg

    Your signature picture has been removed since it contained the Photobucket "upgrade your account" image.

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      #3
      why dont you just weld it?
      sigpic

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        #4
        Originally posted by ///M42 sport View Post
        hmm does that mean you cant get the parts from bmw?
        Right. You can't buy any internal LSD parts from BMW aside from the bearings and seals.

        Originally posted by xwill112x View Post
        why dont you just weld it?
        Because I want my car to turn.
        '91 318is
        sigpic

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          #5
          Thanks for the link! Will come in handy, have half a dozen LSD's kicking round :D
          - Chris
          Project M42 - 255 @ 19 psi

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            #6
            Thanks Brew.
            https://www.facebook.com/BentOverRacing

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              #7
              Thanks for posting that.

              Erik

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                #8
                hot

                Comment


                  #9
                  So. what parts should we buy to rebuild a diff? I'm assuming the internal gears are fine. The clutch disks obviously need to be redone. Anything to fuck with ramp angle?

                  Status: HG repair. 488wtq though!

                  Comment


                    #10
                    Great!

                    There's a pretty good writeup on how to replace the parts here:
                    http://www.factory3performance.com/p...eplacement.pdf

                    Originally posted by whysimon
                    WTF is hello Kitty (I'm 28 with no kids and I don't have cable)

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                      #11
                      Originally posted by shiboujin View Post
                      So. what parts should we buy to rebuild a diff? I'm assuming the internal gears are fine. The clutch disks obviously need to be redone. Anything to fuck with ramp angle?
                      You'll need 2 clutch discs, part 951 332 551 00 , and if you want, 2 friction plates, which is number 9( http://www.autoatlanta.com/porsche-p...-91/305-05.php) and available in 3 different sizes to adjust the carrier preload.
                      '91 318is
                      sigpic

                      Comment


                        #12
                        Originally posted by shiboujin View Post
                        So. what parts should we buy to rebuild a diff? I'm assuming the internal gears are fine. The clutch disks obviously need to be redone. Anything to fuck with ramp angle?
                        Look on the 2nd picture in the PDF. Those V-notches are the ramps. They would have to be machined to change the angle.
                        '89 325i track sloot
                        '01 530i daily

                        -Enginerd

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                          #13
                          Originally posted by whiltebeitel View Post
                          Look on the 2nd picture in the PDF. Those V-notches are the ramps. They would have to be machined to change the angle.
                          I know. but is there an easy way to change the ramp angle without a machine shop?

                          Originally posted by Brew View Post
                          You'll need 2 clutch discs, part 951 332 551 00 , and if you want, 2 friction plates, which is number 9( http://www.autoatlanta.com/porsche-p...-91/305-05.php) and available in 3 different sizes to adjust the carrier preload.
                          Bimmer world has the clutches for cheaper.
                          http://store.bimmerworld.com/shared/...immerworl&All=

                          So the thicker dog ear splines increase lockup?

                          Status: HG repair. 488wtq though!

                          Comment


                            #14
                            Originally posted by shiboujin View Post
                            Bimmer world has the clutches for cheaper.
                            http://store.bimmerworld.com/shared/...immerworl&All=

                            So the thicker dog ear splines increase lockup?
                            Bimmerworlds are $75 each, the Porsche ones are $54 each.
                            '91 318is
                            sigpic

                            Comment


                              #15
                              Originally posted by shiboujin View Post
                              I know. but is there an easy way to change the ramp angle without a machine shop?
                              File? LOL
                              '89 325i track sloot
                              '01 530i daily

                              -Enginerd

                              Comment

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