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Thread: The E36 Diff Thread

  1. #426
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    My understanding is a shallower ramp angle requires less slippage to lock the clutch packs. So a 30 deg ramp will lock quicker than a 45 deg ramp (2 common angles on accel). I had a Metric Mechanic 3 clutch diff in my E46 330Ci. I know it had a 30deg accel ramp, not sure what the decel ramp was. It locked up quick and made the rear axle more lively. Took some getting used to but I loved it. Not sure if it was a 1 way but didn't notice much understeer but driving is always a big variable.

    This is a good info paper on diffs...

    http://metricmechanic.com/wp-content...ferentials.pdf


    2011 E90 ///M3 Individual
    2004 ///M3 - Track Car

  2. #427
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    Quote Originally Posted by babciadementor View Post
    Diff ratio will be 3.91 or 4.44. The problem is if this small type diff will last long especially with slighty moded M52B28 in track day use? Some says that they drive 5+ years with small type diff & 2.5/2.8 and diff still works excellent and some say that it will last one training/trackday. So I'm little bit confused and dunno what to do.
    I ran a 168 diff in my 93 325is with built motor. I was making 270whp and 240ft/lbs of torque and I was racing the car in Autocross on 275/35-17 sticky race tires (Hoosier A6). I had no trouble but the LSD in the case was not the original E36 one. It was from an old 5 series desiel or something. The weak part of the E30 and E36 lsd is the small cover. The fingers of the cover around the bolt holes are too small. There is a company selling billet covers on eBay that are supposed to be significantly stronger.

    https://www.ebay.com/itm/BMW-LSD-168...gAAOSw4Qdai~Lk
    Last edited by jakermac; 02-18-2019 at 12:52 PM.

  3. #428
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    Quote Originally Posted by bigjae1976 View Post
    My understanding is a shallower ramp angle requires less slippage to lock the clutch packs. So a 30 deg ramp will lock quicker than a 45 deg ramp (2 common angles on accel). I had a Metric Mechanic 3 clutch diff in my E46 330Ci. I know it had a 30deg accel ramp, not sure what the decel ramp was. It locked up quick and made the rear axle more lively. Took some getting used to but I loved it. Not sure if it was a 1 way but didn't notice much understeer but driving is always a big variable.

    This is a good info paper on diffs...

    http://metricmechanic.com/wp-content...ferentials.pdf

    Thanks for the link.

    I sent a few questions over to the folks at diffsonline, and here is the response:

    From a driving/performance perspective, what kind of difference should I expect to feel between a 2 and 3 clutch diff?
    The more clutches you have the smoother and more efficient the dynamic lock is. You would notice if you drove them back to back that the 2 clutch is less consistent.

    How much would a 3-clutch, 35/60 impact understeer?
    A 35/60 setup would have less understeer on corner entry than a stock setup.

    It sounds like the 3-clutch, 35/60 would be a nice package. I just wish I could actually drive in a car with the setup before spending the money.

  4. #429
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    2005 M3 s/c & e30 s50
    Does the e36 6-bolt differential input flange fit onto a 2000 z3m differential? I'm doing an s50 swap into an e30 with ZF trans and z3m differential (4-bolt input flange, 2.93). I have the e30 driveshaft (late model) and e36 M3 drive shaft (6-bolt to the differential). Donor car (excluding differential) was a 1995 M3 with manual trans.
    The part list on realoem shows the e36 m3 has more parts around the input flange than in the z3m (and I think the pictures are wrong in the diagram since the e36 shows a 4-bolt and z3m shows a 6-bolt).
    http://www.realoem.com/bmw/enUS/show...diagId=33_0372
    http://www.realoem.com/bmw/enUS/show...diagId=33_0852

    Are the splines the same?
    Last edited by Zesty Bonanza; 02-20-2019 at 04:51 PM.

  5. #430
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    RRSperry is offline Senior Moment Member BMW E36 M3 Expert
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    Well since the Z3 uses the 168mm diff and the E36 uses the 188 mm diff, I’d bet they aren’t the same.
    No matter where you go, there you are...

  6. #431
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    if i remember correctly, the Z3M differential should be a 188mm 3.23 LSD differential, not 2.93

  7. #432
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    RRSperry is offline Senior Moment Member BMW E36 M3 Expert
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    If I’m not mistaken, it uses the small case 168mm diff and the E30 rear suspension.
    No matter where you go, there you are...

  8. #433
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    I have a medium case z3m diff with 2.93 gearing from https://www.bimmerforums.com/forum/p...8&pp=25&page=1
    The axles and wheels are connected already but not the driveshaft.

  9. #434
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    Is there a difference between the Z3M S52 and the Z3M S54?

  10. #435
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    RRSperry is offline Senior Moment Member BMW E36 M3 Expert
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    Just browsing the parts diagram, no. All z3's seem to have used the E30 rear end and the 168mm case. I mean I could be wrong, it wouldn't be the first time.
    No matter where you go, there you are...

  11. #436
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    The z3 does have the e30 rear suspension, but i think the only 168mm was the 4 cylinder z3s and the 6 cylinder ones were 188mm. at some point they started using the torsion lsd instead of the clutch pack.

    I had a local shop build me a diff using the insides of an 01 z3 differential for my e36 m3, so that differential at least was a 188mm

  12. #437
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    Real OEM shows that an S52 M-Roadster uses a 188mm ring with 3:23 ratio and an S54 uses a 188mm ring with 3:15 ratio.
    [IMG][/IMG]

  13. #438
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    The 188 M3 6 bolt flange and the regular 188 4 bolt flange are interchangeable.

  14. #439
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    Hello, maybe you can help me. I am trying to determine the gearing of this open differential. It sits in a big case, 30mm shafts. Sticker and the metal plate are missing, last photo shows how it looks in comparison with 3.38 small case. All info appreciated.

    IMG_2754.jpgIMG_2696 - Copy.jpgIMG_8534.jpg

  15. #440
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    RRSperry is offline Senior Moment Member BMW E36 M3 Expert
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    Turn input shaft, count turns of output flanges... size of the case is irrelevant.
    No matter where you go, there you are...

  16. #441
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    Count the teeth on the large gear, and count the teeth on the small gear. Divide the bigger number by the smaller number. The quotient (answer) is your gear ratio.

  17. #442
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    if you have a whine from the diff... is that usually the pinion, or output bearings?
    Last edited by TH3 Shifty; 04-12-2019 at 02:32 PM.
    98 Estoril ///M3 4/6
    S54 swap CSL

  18. #443
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    Quote Originally Posted by TH3 Shifty View Post
    if you have a whine from the diff... is that usually the pinion, or output bearings?
    All 4 bearings and races need replacement as a set.
    Wanganstyle Powertrain
    http://www.wanganstyle.com/

    S54B32 E36 M3 DTA S100 Sedan Street car full swap:
    http://forums.bimmerforums.com/forum....php?t=1437471

  19. #444
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    If the whine starts right after you install stiffer diff bushings, it might be the bushings transmitting diff noise.

  20. #445
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    Last question, got my new 3.46 ring and pinion, need to remove that speedometer gear from the LSD. Is that just pressed on? Best way to remove it? Best way to reinstall it?
    98 Estoril ///M3 4/6
    S54 swap CSL

  21. #446
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    RRSperry is offline Senior Moment Member BMW E36 M3 Expert
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    You disconnect the sensor, remove the diff, change the gearset, install the diff, then plug in the sensor.. as far as I know, they are all the same.
    No matter where you go, there you are...

  22. #447
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    No I mean the metal wheel that’s notched, that slides through the sensor, it’s attached and to the diff itself
    Attached Images Attached Images
    Last edited by TH3 Shifty; 07-05-2019 at 07:14 PM.
    98 Estoril ///M3 4/6
    S54 swap CSL

  23. #448
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    RRSperry is offline Senior Moment Member BMW E36 M3 Expert
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    Oh, sorry I had Jon Thayer rebuild mine.
    No matter where you go, there you are...

  24. #449
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    It appears it’s just pressed on but I want to make sure I don’t FUBAR it trying to remove it
    98 Estoril ///M3 4/6
    S54 swap CSL

  25. #450
    RRSperry's Avatar
    RRSperry is offline Senior Moment Member BMW E36 M3 Expert
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    Pretty sure the entire rebuild procedure is in the E30 section of the TIS.
    No matter where you go, there you are...

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