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Does your E30 have a Limited Slip Differential? (LSD)

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  • jeffnhiscars
    replied
    And the problem with spinning one side and looking to see which direction the other side turns is that, by the time you get around to the other side, it's no longer turning :)

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  • jeffnhiscars
    replied
    The stamp3d tag will give you the ratio with an S indicating it's an LSD.

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  • TobyB
    replied
    That's a casting mark. You want a stamped flat metal tag under one of the bolts.

    Or a burnout.

    t

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  • The Dark Side of Will
    replied
    If it's off the car, just try to spin the axles. If you can spin them opposite each other by hand, it's open. If you can't it's limited slip.

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  • Rev Run D
    replied
    [QUOTE=LateFan;4983714] (oh, OFF the ground you can check)

    Yeah, just lift the rear end off the ground so that the wheels are in the air, release the ebrake and put the car in neutral, and spin one wheel manually, and look at the opposite wheel to see what it's doing.

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  • LateFan
    replied
    Yep. We'll have to find a dirt road - it's an auto eta remember! (oh, OFF the ground you can check)

    I just don't want to put the wrong oil in it.

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  • Rev Run D
    replied
    The easiest way to check if it's an LSD is to spin the rear wheels while it's off the ground. if they spin the same direction it's an LSD. If it spins opposite it's an open.

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  • LateFan
    replied
    It's unlikely it was ever off the car, and then I wire-brushed it.

    [ATTACH]127910[/ATTACH]

    [ATTACH]127909[/ATTACH]
    Attached Files

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  • Rev Run D
    replied
    It was painted. Kinda like this:

    The E stands for factory reconditioned.

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  • LateFan
    replied
    Bringing this back up to ask a question -

    Our car is an '86 ES. We had the subframe off recently so I checked the tag, which checks out as a 2.93 LS. But I don't find any "S" stamp or casting on the case. Was that a painted stamp? I saw a reference to a cast-in S on the top.

    I need to refill this diff, so now I'm wondering if it's an LS or not....?

    Did I scrub it off when I degreased it?
    Last edited by LateFan; 06-09-2019, 03:16 PM.

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  • Metallated
    replied
    Originally posted by TobyB View Post
    I pulled a 3.64 small case LSD off of an 85 once. trunk said 318i

    And a 2.93 LSD out of an 87e 4 door. trunk said 325

    And a 3.73 LSD out of a 91 4 door. trunk said 325i


    all I know,
    t
    Thanks for the info, I guess I'll just have to pull it and find out.

    Leave a comment:


  • TobyB
    replied
    I pulled a 3.64 small case LSD off of an 85 once. trunk said 318i

    And a 2.93 LSD out of an 87e 4 door. trunk said 325

    And a 3.73 LSD out of a 91 4 door. trunk said 325i


    all I know,
    t

    Leave a comment:


  • Metallated
    replied
    The list seems to indicate that manual 85 318i came with lsds, is this accurate?

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  • TurboJake
    replied
    Originally posted by NitroRustlerDriver View Post
    My 91 318iS had an open 4.10. So just because it is an iS, doesn't mean it has an LSD, they were still an option.
    The 318is was the only one it was an option on the sport package cars. If its a 325es/is, it was standard.

    I always forget about the 318is.

    Leave a comment:


  • spdracrm3
    replied
    also the IX Diff's are not true LSD ,they are a viscous coupling lock-up diff (ie the amount of lock depends on the amount of slip) due to the affect of the VC fluid dynamics

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