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Thread: Anyone running OS Giken differential?

  1. #1
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    Anyone running OS Giken differential?

    I have a DiffsOnline 4-clutch diff, with the fancy 35/60 ramps etc... I feel like it's a little too aggressive for me; I know it's winning all over the country, it's just me.

    Anyone out there actually running an OS Giken?

    I know urban knowledge says they're "bad" for an E36 - I'm asking if anyone out there has actual experience with one.

    I had one on my miata and loved it, that is to say, I didn't have any wheelspin (I don't now) and I don't notice any diff-created push (I do now).

    Thanks in advance,
    --Bill
    2002 BMW M Roaster.
    1998 BMW 328is SCCA E Production road racer.

  2. #2
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    Guess I'm the guinea pig. I'll report back after my first event with the thing.

    I'm going to take the default (1.5 way) setup from the OSG factory, then go from there. I expect to disengage some of the decel/coast plates at some point early on.
    2002 BMW M Roaster.
    1998 BMW 328is SCCA E Production road racer.

  3. #3
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    Reach out to fsmtnbiker here on the forum.
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  4. #4
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    Quote Originally Posted by CoMZ302 View Post
    I have a DiffsOnline 4-clutch diff, with the fancy 35/60 ramps etc... I feel like it's a little too aggressive for me; I know it's winning all over the country, it's just me.

    Anyone out there actually running an OS Giken?

    I know urban knowledge says they're "bad" for an E36 - I'm asking if anyone out there has actual experience with one.

    I had one on my miata and loved it, that is to say, I didn't have any wheelspin (I don't now) and I don't notice any diff-created push (I do now).

    Thanks in advance,
    --Bill
    I run one and have had great luck with it for the past couple seasons. Bought it second hand and sent it to OSGiken for tuning and inspection. It was much better after that as I think the initial setup was based on some of the supposed internet experts. I would not follow the advice of some of the articles on the internet about disengaging discs etc. Call OSGiken and ask for Jonathan.

  5. #5
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    Thanks for the feedback. I'm going to run it as delivered from those guys, then change things as I think I'll need after some track time. Good tip thanks.
    2002 BMW M Roaster.
    1998 BMW 328is SCCA E Production road racer.

  6. #6
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    They make good stuff, don't know why they'd be "bad" for any car. I think the only reason everyone uses rebuilt BMW diffs is because they're cheaper.

  7. #7
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    We're about to find out. Lands on my doorstep today.

    I'm also going down/up in gearing from 3.91 to 4.27. Never seem to get over 130 except RA and the 3.91 is good for 146.

    Between the two I'm hoping for some time. Still need about a second (and knock off the driving rust) to get to the podium.

    --Bill
    2002 BMW M Roaster.
    1998 BMW 328is SCCA E Production road racer.

  8. #8
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    I'd be interested to hear your feedback on the 4-clutch, 35/60 diff from Diffsonline.

  9. #9
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    I'm interested in the review of the OSG
    none

  10. #10
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    Quote Originally Posted by CoMZ302 View Post
    I have a DiffsOnline 4-clutch diff, with the fancy 35/60 ramps etc... I feel like it's a little too aggressive for me; I know it's winning all over the country, it's just me.

    Thanks in advance,
    --Bill
    Bill:

    I know it's too late, but why not just have Dan at Diffsonline change the ramps?

    Feff

  11. #11
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    Quote Originally Posted by Feffman View Post
    Bill:

    I know it's too late, but why not just have Dan at Diffsonline change the ramps?

    Feff
    It was more expensive to have him fix the ramps than buy a new diff.

    Bonus, now I have two diffs.
    2002 BMW M Roaster.
    1998 BMW 328is SCCA E Production road racer.

  12. #12
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    Aaaannnnnnnddddddd????
    Check out the 8legs Racing page: https://www.facebook.com/8legsRacing/


  13. #13
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    Aaaannnnnnnddddddd????
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  14. #14
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    Quote Originally Posted by ScotcH View Post
    Aaaannnnnnnddddddd????
    Bllizzard-pocalyps-bomb-cyclone thingy happened last week. Local track is currently digging out.... Southern track is closed for surface repair until mid-April.

    yup... I'm following this too.

  15. #15
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    I liked mine so much I get a second one, 3.64 and 3.91. The best thing I can say about it is that you will never think about it again; it doesn't do anything nasty under braking, doesn't cause understeer and obviously gives you all the locking you need on exit.

  16. #16
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    Hello all I’m new to all this I had a 3.91 in my car but my mechanic is convinced that 3.23 would be better for street/track is he right? Cause I’m seeing 3.91 and higher suggested on here

  17. #17
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    Quote Originally Posted by Razoomz View Post
    Hello all I’m new to all this I had a 3.91 in my car but my mechanic is convinced that 3.23 would be better for street/track is he right? Cause I’m seeing 3.91 and higher suggested on here
    For track, definitely 3.91. For street, you decide ... it's about high revs, and possibly annoying drone from exhaust.
    Check out the 8legs Racing page: https://www.facebook.com/8legsRacing/


  18. #18
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    Quote Originally Posted by Razoomz View Post
    Hello all I’m new to all this I had a 3.91 in my car but my mechanic is convinced that 3.23 would be better for street/track is he right? Cause I’m seeing 3.91 and higher suggested on here
    If you don't hate your 3.91, stick with it. whatever
    My e46 330iT just went from 3.64 to 3.23 and it's so much better to commute. So much. Basically no change in the parking lot and at the track.
    none

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