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Thread: Has anyone used VAC Differential Cooler?

              
  1. #1
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    Has anyone used VAC Differential Cooler?

    Hi everyone,


    I am planning on getting a clutch type LSD some time this spring and I am thinking about how to properly cool the diff. Even though the finned diff covers are easier and simpler, I do not think they are sufficient to properly cool a clutch type differential.


    I am interested in this differential cooling kit by VAC:


    Click here to enlarge


    Comes with pump, cooler, lines, fittings and a thermoswitch which will automatically turn on/off the cooling pump.


    Has anyone played with this or other diff cooling kits on the E90?
    How loud are those pumps?
    From all the things I've lost,
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    Not a fan of the Mocal pumps,at least in my experience not that reliable.
    Have seen quite a few diffs and sequential gearboxes blow up on the track due to the Mocal pumps failing...

    I prefer using the VDO units.

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    Thank you for the feedback. I appreciate it. I might have to build my own kit which would probably be cheaper anyway.

    Anyone else?
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    Unless you're planning to do endurance racing, you don't need a diff fluid cooler. Good fluid and a properly finned cover will be more than adequate.

    Neil

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    Click here to enlarge Originally Posted by MDORPHN Click here to enlarge
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    Unless you're planning to do endurance racing, you don't need a diff fluid cooler. Good fluid and a properly finned cover will be more than adequate.

    Neil

    ...even for a clutch type differential which provides locking during both acceleration and deceleration?
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    Yes.

    BMW has been putting clutch type diffs in its M cars for decades without separate diff fluid coolers. So have loads of other manufacturers.

    Neil

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    Click here to enlarge Originally Posted by MDORPHN Click here to enlarge
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    Yes.

    BMW has been putting clutch type diffs in its M cars for decades without separate diff fluid coolers. So have loads of other manufacturers.

    Neil

    True! My understanding however is that the M differentials were mostly made by Drexler and usually contain 8 clutch plates. The OS Giken TCD LSD that I am most probably going to purchase has 20 clutch plates. I am not exactly sure how this affects anything so that's why I thought I'd ask here...
    From all the things I've lost,
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    Looks like overkill to me. We haven't really gauged diff temps on our cars but I doubt such massive cooling is needed. AFAIK there have been next to,no aftermarket LSD failures. therefore I'd stick with a finned diff cover which also allows to fill in more oil. That should suffice.
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    The OS Giken diffs actually run cooler than other clutch type diffs. The finned cover should be useful but not necessary especially for track days 20-30 minute sessions.

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    Click here to enlarge Originally Posted by DallasBoosted Click here to enlarge
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    The OS Giken diffs actually run cooler than other clutch type diffs. The finned cover should be useful but not necessary especially for track days 20-30 minute sessions.

    Thanks for the input! I appreciate it. I guess I'll just get the street version of the finned diff cover.
    From all the things I've lost,
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    I've boiled the fluid on my Quaife LSD 335 during 20-30 min sessions using the stock plate. Now with the VAC race length finned diff, I've had no issues.

    Can't comment on the diff cooling system.

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    Don't do it!


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    Click here to enlarge Originally Posted by blisstik Click here to enlarge
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    Don't do it!
    why?

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    Click here to enlarge Originally Posted by vasillalov Click here to enlarge
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    Thanks for the input! I appreciate it. I guess I'll just get the street version of the finned diff cover.
    Click here to enlarge Originally Posted by Sticky Click here to enlarge
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    why?
    Because not racecar, yo.

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    This is a race car solution. If you want a little extra security you may want to consider our finned diff cover. The OS runs really really well as is, you will be surprised with how good it is :-)

    Click here to enlarge Originally Posted by vasillalov Click here to enlarge
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    Hi everyone,


    I am planning on getting a clutch type LSD some time this spring and I am thinking about how to properly cool the diff. Even though the finned diff covers are easier and simpler, I do not think they are sufficient to properly cool a clutch type differential.


    I am interested in this differential cooling kit by VAC:


    http://www.bimmerboost.com/images/im...CK10MJPG-1.jpg


    Comes with pump, cooler, lines, fittings and a thermoswitch which will automatically turn on/off the cooling pump.


    Has anyone played with this or other diff cooling kits on the E90?
    How loud are those pumps?

  16. #16
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    1 out of 1 members liked this post. Reputation: Yes | No
    Click here to enlarge Originally Posted by Itsbrokeagain Click here to enlarge
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    Because not racecar, yo.
    Click here to enlarge

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