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    Z3 Diff Question

    Is there a way to determine the gear ratio on a Z3 Diff from the last 7 numbers of the Vin? I was told it is a "3.2 LSD." Its from a 98 2.8 Manual Z3. I assume that it is a 3.23 LSD given the year of the car and motor/trans. Appreciate the help.

    #2
    Should be 3.23 or 3.15. Non-M Z3's used a torsion diff. Only the MZ3 had an 3.23 clutch type LSD.
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    1987 325e Lachssilber w/ MarkD chip and late bumpers, Zender EVO spoiler, s3.25 LSD

    Originally posted by nando
    I don't think there's really strong evidence that ZDDP harms cats.

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      #3
      Do you not have it yet? Is the ratio tag not on it?

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        #4
        Originally posted by The Dark Side of Will View Post
        Do you not have it yet? Is the ratio tag not on it?
        There isn't a tag on either of my Z3 diffs.
        My Garage
        2001 Z3 2.5i Steel Gray/Black (Lexi)
        1988 325ix Diamond Schwartz/Black (Izzy)
        1989 325i Cirrus Blue/Houndstooth (Stitch)
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          #5
          Funky. My dad bought two 3.07 torsen Z3 diffs and I could have sworn they had tags.

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            #6
            Hmm, I wonder if it has anything to do with the model. Both of mine are are from a 2.5 Z3. One from a 2001 M54b25, and the other from a 1999 M52tub25 (I believe thats a 3.15 ratio). Both are also extremely low miles (less than 25,000 miles when they came into my possession) so I don't believe the tags were removed.

            Edit: Well I guess the M52tuB25 Z3 was technically labeled as a 2.3 liter
            My Garage
            2001 Z3 2.5i Steel Gray/Black (Lexi)
            1988 325ix Diamond Schwartz/Black (Izzy)
            1989 325i Cirrus Blue/Houndstooth (Stitch)
            Feedback

            Instagram: Stone.Hopkins

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              #7
              I was just looking at a 3.15 diff from a '99 2.5 Z3 and couldn't tell if it was open or LSD other than rotating the shafts. Is there a way to check this by the diff sticker? Or vin for that matter?

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                #8
                if you have the differential and you are curious about the ratio, just spin the pinion and count the rotations out. You can do it 10x for more accuracy, just requires a little more math. edit: I'm an idiot.



                You can determine the car's vin attributes and then see if you can find a reference table for the combination/diff ratio. For example, my e46 touring had manual and sport package and is a 323i. You can then determine that it had a 3.46 in the rear based on other information on the internet.

                Search for a vin decoder. It likely won't tell you the ratio directly, but it will probably help you find it.
                Last edited by Jaxx_; 02-13-2019, 01:38 AM.
                '84 318i M10B18 147- Safari Beige
                NA: 93whp/90ftlbs, MS2E w/ LC, 2-Step
                Turbo: 221whp/214ftlbs, MS3x flex @ 17psi

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                  #9
                  Originally posted by rcarradine View Post
                  I was just looking at a 3.15 diff from a '99 2.5 Z3 and couldn't tell if it was open or LSD other than rotating the shafts. Is there a way to check this by the diff sticker? Or vin for that matter?
                  It should have a Torsen LSD.

                  Torsen's have a blue washer around the speed sensor.
                  "I'd probably take the E30 M3 in this case just because I love that little car, and how tanky that inline 6 is." - thecj

                  85 323i M TECH 1 S52 - ALPINEWEISS/SCHWARZE
                  88 M3 - LACHSSILBER/SCHWARZE
                  89 M3 - ALPINEWEISS II/M TECH CLOTH-ALCANTARA
                  91 M TECHNIC CABRIO TURBO - MACAOBLAU/M TECH CLOTH-LEATHER

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