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Thread: 2JZ E36 Diff Questions

  1. #1
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    2JZ E36 Diff Questions

    Hey,
    Deep into the research and saving funds stage of the 2jz e36 swap and now have enough for the 2jz and the r154 manual trans.
    im a little stuck as to what would be the best route for reliable drivetrain options for powers around 650-700rwhp
    Ive been reading that the r154 manual trans is specified for a 4.10 ratio and was thinking a e24 m6 diff would be pretty close and might work as it uses a flange and isn't a CV style to connect to the driveshaft.
    or maybe an e30 4.10?
    I realize that fab will be needed but the less the better,
    thanks in advance for any help!
    -Steven

  2. #2
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    3.91 is the most available high ratio diff for the e36. I used to run a 3.91 with my r154 in my e36 but with big power your 1st and 2nd become useless.

    BTW no fab at all needed to throw a 3.91 from an auto e36 in there.

  3. #3
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    3.91lsd what i run, no complaints, really pulls nice! At those power ranges you should get a custom driveshaft.

  4. #4
    Jkpgt96's Avatar
    Jkpgt96 is offline One of those JZ swappers BMW CCA Member
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    I bought a 3.15 210mm LSD diff wit the intention of putting a 4.10 in it from diffsonline...you his think a medium case will stand the test of time with 650+ wheel?
    1995 M3 - Forged 9.8:1 2JZ, S366, MS3x, E85, LQ9s, 420g/PMC Motorsport kit, 4 clutch 3.15 LSD Large Case 757whp/710wtq
    2011 X5 Xdrive35d- Blk on Cinnamon, Towing Pkg, Heat Pkg., etc..the tow rig/DD!

  5. #5
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    Quote Originally Posted by Jkpgt96 View Post
    I bought a 3.15 210mm LSD diff wit the intention of putting a 4.10 in it from diffsonline...you his think a medium case will stand the test of time with 650+ wheel?
    R154 gearbox is used in the MK3 supra body with a 3,90 final drive in the highest trim 1jz-gte turbo supra; If you are pushing 600rwhp then a LONGER final drive would be nice for traction; the gearing setup has issues with traction at 500rwhp (spins 1/2/3 gears with 6mt)

    *** on the high gearing side of things***
    one can order the 210mm 4,10 Motorsports gear set directly from BMW if so desired. 427 and 445 are also made for the 210mm standard; Drexler (germany) also makes super strong racing gears

    Whats inside either 210mm lsd unit or 188mm LSD unit and the setup of the diff itself is really the determination of survival. Neither units will live very long at 600rwhp with mystery old guts in side and in stock configuration; its not just a matter of throwing parts at it either.

    188mm unit has been proven to take 1krwhp reliably in drag race use; for high power street/ occasional drag race use a 210 would be a wider safety range item. Cost of playing with 210mm units is literally about double the 188's.

    - - - Updated - - -

    Quote Originally Posted by Ethirtysex2020 View Post
    Hey,
    Deep into the research and saving funds stage of the 2jz e36 swap and now have enough for the 2jz and the r154 manual trans.
    im a little stuck as to what would be the best route for reliable drivetrain options for powers around 650-700rwhp
    Ive been reading that the r154 manual trans is specified for a 4.10 ratio and was thinking a e24 m6 diff would be pretty close and might work as it uses a flange and isn't a CV style to connect to the driveshaft.
    or maybe an e30 4.10?
    I realize that fab will be needed but the less the better,
    thanks in advance for any help!
    -Steven
    don't bother with a relic item; with 3,91 you will already have traction problems and there is no reason to cut up / weld your rear end to take a 30 year old differential......... Much better is bolting in a 188mm 3,91 from 325iA or going with the CES mount kit for a 210mm differential from a E32 V12 (much bigger can of worms than bolting in a 325ia e36 unit)- but at least they both BOLT IN and are proven to 1krwp

    Quote Originally Posted by Jkpgt96 View Post
    I bought a 3.15 210mm LSD diff wit the intention of putting a 4.10 in it from diffsonline...you his think a medium case will stand the test of time with 650+ wheel?
    why not a 3,64 final drive (common item from e46 m3) - much cheaper than a motorsports 4,10 gearset in 210mm. unless you have some really trick drag suspension or a different gearbox entirely -(t56/tko) a 4,10 doesnt suit a toyota gearbox high power 2jz 5mt or 6mt car at all

    Whats inside either 210mm lsd unit or 188mm LSD unit and the setup of the diff itself is really the determination of survival. Neither units will live very long at 600rwhp with mystery old guts in side and in stock configuration; its not just a matter of throwing parts at it either.

    188mm unit has been proven to take 1krwhp reliably in drag race use; for street +strip use a 210 would be a wider safety range item. Cost of playing with 210mm units is literally about double the 188's.

    If one has the budget ordering an OS giken LSD and keeping the 188 standard is the easiest thing avail; you wont break the OS unit with any power level; better to spend on the unit than on rather expensive gears; I would suggest street use cars above 600rwhp to 210mm units though.
    Last edited by wanganstyle; 11-24-2013 at 10:17 AM.
    Wanganstyle Powertrain
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    S54B32 E36 M3 DTA S100 Sedan Street car full swap:
    http://forums.bimmerforums.com/forum....php?t=1437471

  6. #6
    Jkpgt96's Avatar
    Jkpgt96 is offline One of those JZ swappers BMW CCA Member
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    Good info! I know about the ratio versus strength issue, I suppose my question was more in regards to the shorter 3.91/4.10 medium cases gearsets...but it sounds like in either case they would be fine as long as you know the condition or them and they are setup correctly. I was also concerned with matching a good ratio for traction seeing as the e36 is about 600 lbs lighter than a dressed up mk3. I jcurrently have a 3.38 in my car but I know that is going to be too long. What about a 3.73 or 3.64? Those still going to be too long?
    1995 M3 - Forged 9.8:1 2JZ, S366, MS3x, E85, LQ9s, 420g/PMC Motorsport kit, 4 clutch 3.15 LSD Large Case 757whp/710wtq
    2011 X5 Xdrive35d- Blk on Cinnamon, Towing Pkg, Heat Pkg., etc..the tow rig/DD!

  7. #7
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    Quote Originally Posted by Jkpgt96 View Post
    Good info! I know about the ratio versus strength issue, I suppose my question was more in regards to the shorter 3.91/4.10 medium cases gearsets...but it sounds like in either case they would be fine as long as you know the condition or them and they are setup correctly. I was also concerned with matching a good ratio for traction seeing as the e36 is about 600 lbs lighter than a dressed up mk3. I currently have a 3.38 in my car but I know that is going to be too long. What about a 3.73 or 3.64? Those still going to be too long?
    You won't have much traction with a 3,91 or 4,10 when the boost hits if you are pushing 600rwhp unless on some fat slicks.
    A shorter ratio is also not as good for Spool; turbochargers (esp. one in the 600-800rwhp range will need LOAD to make boost - or anti Lag)

    Try a 210mm 3,64 from a E46 M3 or e60 M5;Common and modern, inexpensive gear set.
    Designed by BMW to handle a 4,000++ lb E60 M5 with S85 v10 engine (8500rpm 500hp factory)
    +
    Order an OS Giken or quaife or whatever diff suits your taste/budget
    +
    drop off at local rear end shop.
    Last edited by wanganstyle; 11-24-2013 at 10:29 AM.
    Wanganstyle Powertrain
    http://www.wanganstyle.com/

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

  8. #8
    Jkpgt96's Avatar
    Jkpgt96 is offline One of those JZ swappers BMW CCA Member
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    Yes turbos need load to spool, I just was worried about the gearing being still too long, but if you feel it will be okay then cool!

    I'll look into an aftermarket diff as well, since at least for my situation my 210 diff is not going in right away anyway.
    1995 M3 - Forged 9.8:1 2JZ, S366, MS3x, E85, LQ9s, 420g/PMC Motorsport kit, 4 clutch 3.15 LSD Large Case 757whp/710wtq
    2011 X5 Xdrive35d- Blk on Cinnamon, Towing Pkg, Heat Pkg., etc..the tow rig/DD!

  9. #9
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    Quote Originally Posted by Jkpgt96 View Post
    Yes turbos need load to spool, I just was worried about the gearing being still too long, but if you feel it will be okay then cool!

    I'll look into an aftermarket diff as well, since at least for my situation my 210 diff is not going in right away anyway.

    OS Giken makes the TRD diff for toyota's RWD cars (mk4 supra, JZZ30, LS400, GS300); its a cast special OEM unit for toyota and known to handle 1200-1400rwhp happily. Silent and good mannered for parking as well
    Wanganstyle Powertrain
    http://www.wanganstyle.com/

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

  10. #10
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    Dude.....plz come on my thread and help me. you seem to know alot and alot is the amount of help I need! �� got lots of questions I need answers for

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