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  1. #1
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    Post VAC Motorsports | 335i Billet Finned Differential Cover

    Click here to enlarge


    Buy now:
    http://store.vacmotorsports.com/vac-...e93-p2493.aspx

    We build a lot of differentials. When we took possession of our 135i in 2008 we quickly realized that the stock cover did not have a drain. Since the goal was to add a performance limited slip unit, we felt it made sense to make a new differential cover which would really work for street and track use. We put a lot of time into the design, focusing on both absolute function and form. A LOT of machine work goes into this piece, I will let the pics speak for themselves.

    BMW will tell you that the gear oil is a life-time fill. We disagree. This frustration is compounded by the fact that the OE diff cover doesn't even have drain and fill plugs!

    Under hard use, LSDs equipped diffs can run very hot, even the OS Giken diffs have been known to cook gear oil. Our finned cover is stronger and offers much better heat dissipation that these cars need when going to the track.

    Features:

    -Increase oil capacity - by a whopping 50%

    -Increase cooling capacity - via heat-dissipating fins

    -Machined from a single billet of 6061-T6 aluminum - for unmatched strength, elimination of flex and durability. Cast covers can and do fail.

    -Drain and fill provisions - stock units does not have a drain so oil changes are quite difficult

    -“AN” style plugs - -8AN o-ring fittings. For the serious road race enthusiast, this cover allows you to simply 'plug in' an external differential oil-cooler

    -Integral and baffled vent for street cars - All differentials must have a vent

    -Pre-machined catch-can provision -simply 'plug in' an external catch can fitting (for racecars)

    -Pre-machined provision for differential oil temperature sensor - just plug your temp sensor in, no drama

    -OE Quality 10.9 grade flanged hex head hardware provided

    -No adverse effects on ride quality or noise

    -Excellent ground clearance

    -Available in street length (11") and race length (12") (see pics below)

    -Fits RWD and AWD models

    -Convertible Models (E93 and E88 cabrio) - these may fit with custom clearance work, but we do not recommend these covers.

    -As always, Made in the USA in house at VAC

    Click here to enlarge

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    Baffled vent:
    Click here to enlarge

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    Last edited by Mike@VAC; 11-22-2013 at 12:06 PM.

  2. #2
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    Sold 5! this week thanks to the sale :-) They are $725 till next Thursday!

    They only fit the very early large body 6AT units - not the more common small 6AT. It also fits all 6MT, all DCT, all diesel. Also, no convertible.

    Click here to enlarge

    Click here to enlarge
    Last edited by Mike@VAC; 11-22-2013 at 12:07 PM.

  3. #3
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    That black one is so bad ass. You guys do some cool work!

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    Great looking piece. For those considering it, get it before the price goes up...
    Stage 2 or 2.5 E9X M3 S65 V8 supercharger kit for sale: http://www.boostaddict.com/showthrea...r-kit-for-sale

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    sooo sweet!
    very nice work - I'll def snag one when I upgrade to a true LSD
    cp-e: FMIC, TBE, charge pipe w/Tial BOV, DCI
    Cobb AP V3 - Stett stage2 oil cooler - RB valve&cap - BMS occ, clutch stop, clutch valve - M3 trans mounts

  6. #6
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    VAC is awesome. I had my quaiffe LSD from them for 2 years and loved it. Its a "must have" mod for the 335/135 imo
    Click here to enlarge
    ESS 6XX kit

  7. #7
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    I wanted to ask, what is the main difference between the Track (12") and the normal (11") shorter versions?

    How easily is it for the longer 12" to scrape something on the ground? What length/size is the stock/OEM one?

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    When the budget allows i would definitely throw that black one on.

  9. #9
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    I don't think that extra 1" of length would increase any chance of scrapping anything.

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    Is there an equivalent of this for the M3?

  11. #11
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    The m3 already has a finned diff cover

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    Click here to enlarge Originally Posted by Ericbh77 Click here to enlarge
    The m3 already has a finned diff cover
    I know, but I wanted to know if they have one with a better fin design/the additional AN style plugs.

  13. #13
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    I don't see one on their site but i'l l ask when i stop by on Wed

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    Click here to enlarge Originally Posted by Ericbh77 Click here to enlarge
    I don't see one on their site but i'l l ask when i stop by on Wed
    Thanks man!

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    Click here to enlarge Originally Posted by Karura Click here to enlarge
    I wanted to ask, what is the main difference between the Track (12") and the normal (11") shorter versions?

    How easily is it for the longer 12" to scrape something on the ground? What length/size is the stock/OEM one?
    I would assume the longer version offers better cooling? I remember seeing a photo of this similar cover a while ago and it looked like it would be destroyed on some roads near me

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