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Diffs & LSDs

Posted by wret, Jan 19, 2007

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  1. wret

    wret Proven Member

    Joined Jul 3, 2003
    Bel Air, Maryland
  2. BOOstGhost

    BOOstGhost Proven Member

    Joined Dec 17, 2003
    Vacaville, California
    great read, thanks.

    331  0

    1995 Eagle Talon TSi AWD
    · 2G DSM
  3. jtmcinder

    jtmcinder DSM Wiseman

    Joined Nov 4, 2003
    Iowa City, Iowa
    The LSDs article was updated, since it's really true that the silicone goo increases in viscosity with temp. Thanks to all that provided info and links.

    - Jtoby
  4. jtmcinder

    jtmcinder DSM Wiseman

    Joined Nov 4, 2003
    Iowa City, Iowa
  5. mschlanglv

    mschlanglv Proven Member

    Joined Feb 16, 2008
    Duluth, Minnesota
    Question on that, after a spring track day in LV I found that I could freely spin a rear tire when the other three were on the ground. After things cooled down and I had gone home I could no longer do the same.

    I figured the rear LSD had gotten so hot it lost its "locking" ability, but that doesn't jive with the above articles. Thoughts?

    633  0

    1991 Eagle Talon TSi AWD
    manual · 1G DSM
  6. jtmcinder

    jtmcinder DSM Wiseman

    Joined Nov 4, 2003
    Iowa City, Iowa
    Most fluids lose viscosity as they heat up. For a long time, I thought that the fluid in a VC was like this and that the hard lock that you reach when the VC is very hot was the plate-to-plate contact only. But people kept saying that the goo was something special that increases viscosity and, while I could find no peer-reviewed paper on it, there were enough statements to the same effect out there that I changed the article to what it says now. This has always bugged me, because I'm not 100% sure of that part, but as time passed, I got over my worries and went on with life.

    Thanks a bunch for bringing all of the worries back. :)
    Last edited by a moderator: Jul 10, 2014
  7. zedicus

    zedicus Proven Member

    Joined Aug 4, 2011
    Garden city, Kansas
    overheating the silicone fluid causes sudden loss of the LSD effect. fails in the 'open' state.

    it does expand/add friction when heated to a point, and that causes the initial tranfer of the LSD function. at a certain point of expansion they cause the plates to lock together (because only half the plates have holes for it to pass through while the other half get forced over) its like a cross between a torque converter and a wet clutch.

    also the silicone fluid in a viscous coupling has a life expectancy of 60,000 miles under normal use. after that its pretty much open anyway, and since its non-serviceable in our case, the core needs swapped for it to be good again. (actually mine seems to hold a lot of torque still and im at 120,000 miles and half that has been sheer abuse)

    Street Build 623  1

    1995 Eagle Talon TSi
    fwd · manual · 2G DSM
  8. TrueBoost88

    TrueBoost88 Probationary Member

    Joined Feb 14, 2018
    Elgin, Illinois
    Can I use non lsd axles in a lsd differential?

    Drag Race Build 780  9

    1997 Mitsubishi Eclipse GSX
    awd · manual · 2G DSM
  9. spoolnmotorsports

    spoolnmotorsports Probationary Member

    Joined Feb 12, 2020
    Towson, Maryland
    Yes, but you need inner lsd axle cups

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