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      02-10-2014, 11:59 AM   #89
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Quote:
Originally Posted by dcaron9999 View Post
Reviving an old thread ...
Any news on the E8x/E9X finned diff cover project?
Are there any options out there besides the $800 one from VAC Motorsports?
Thanks.
We did start one, but it did not fair the market well so we scrap it.
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      02-10-2014, 12:40 PM   #90
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Originally Posted by HP Autosport View Post
We did start one, but it did not fair the market well so we scrap it.
Thanks Harold.

When would a finned diff cover actually be justified?

Did you ever see cases of burnt LSD units due to overheating at the track? I heard of such an experience on two occasions from a local forum member, but dont have the specifics. Maybe this could happen if you are going to be lapping for an extended period of time, without cool downs ,etc.

Is there a simple visual check one can make such as diff fluid boiling and oozing out out from the top vent hole on the diff?

One serious advantage with the specific cover from VAC is its larger capacity to hold diff fluid. Beyond the cooling from the air exposed fins, the larger qty of fluid in itself must help with lowering the temperature and keeping the metal shavings in lower concentration between fluid change intervals. Just speculating ...
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Last edited by dcaron9999; 02-10-2014 at 12:48 PM..
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      02-10-2014, 12:49 PM   #91
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My buddy did a review of the VAC diff cover on his 335i. http://www.e90post.com/forums/showthread.php?t=720740
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      02-10-2014, 01:59 PM   #92
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Quote:
Originally Posted by Splinterz88 View Post
...My buddy did a review of the VAC diff cover on his 335i...
Thanks for link.

So he did boil over his fluid, to the point of it spewing from the vent hole. Could have been old expired fluid. Perhaps 75W140 fluid could have resisted better versus stock 75W90 fluid. Maybe not.

$800 for a silly cover though! When replacing the diff, it's one of those, "while you are in there, might as well fix it" mods ...
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2011 X3 35i with M pack + 2011 135i w/6SPMT | 255 square tire setup | Quaife 3.46 LSD | Diff lock down bracket | Bilstein B8+Swift SpecR springs+H&R FSB | CDV delete | BMS Oil Tstat bypass | ER FMIC & CP | N54Tuning DP | GC Street Camber Plates | M3 FCA +guide rods+RSFB's+Tranny mounts | Manzo toe arms | Cobb Stg2 agressive tune | Hawk DTC70 brake pads | RB SS brake pistons | Goodridge SS brake lines | Custom brake cooling ducts

Last edited by dcaron9999; 02-10-2014 at 03:45 PM..
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      02-10-2014, 04:00 PM   #93
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Quote:
Originally Posted by dcaron9999 View Post
Thanks Harold.

When would a finned diff cover actually be justified?

Did you ever see cases of burnt LSD units due to overheating at the track? I heard of such an experience on two occasions from a local forum member, but dont have the specifics. Maybe this could happen if you are going to be lapping for an extended period of time, without cool downs ,etc.

Is there a simple visual check one can make such as diff fluid boiling and oozing out out from the top vent hole on the diff?

One serious advantage with the specific cover from VAC is its larger capacity to hold diff fluid. Beyond the cooling from the air exposed fins, the larger qty of fluid in itself must help with lowering the temperature and keeping the metal shavings in lower concentration between fluid change intervals. Just speculating ...
You will not have a problem with a Quaife or Wavetrac as they product much less heat than a clutch type LSD. We have tracked and competed our 335i without a finned cover of any kind without any issues. Our 135i was tracked with and without the finned cover, again, without any issues.

In the years of running both Quaife and Wavetrac we have not seen metals in the gear oil. If you do, there is a problem. You may be accustomed to the clutch type LSD, which will deposit lots of metal in the oil between changes from wear and tear.
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