VAC Motorsports | 335i Billet Finned Differential Cover - BMW 3-Series (E90 E92) Forum

Mike@VAC · 07-18-2012, 11:36 AM

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. Since 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) require slight modifications to OEM chassis bracing: 3 longer bolts are required, and only the Street Cover will clear this chassis.

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

Baffled vent:

sutter2k · 07-18-2012, 11:47 AM

You should add a link to your website from your profile.

jyeah · 11-28-2012, 01:41 PM

Does this fit the housing for an AT LSD? I heard that there were some fitment issues with an AT?

808AWD325xi · 12-27-2012, 11:50 AM

Any plans to build a cover for autos with the small pumpkin?

Mike@VAC · 12-27-2012, 10:16 PM

Hey guys,

Unfortunately, large pumpkin (AT or MT) only for now.

It is not a direct fit with convertibles.

jyeah · 12-28-2012, 10:31 PM

Any plans for the small pumpkin in the future?

Also, might want to update your webpage just in case of confusion.

WhiteonWheat · 12-31-2012, 05:26 PM

Will this fit my 2011 N55 e90 LCI?

Thanks!
-WoW

07-18-2012, 11:36 AM	#1
Mike@VAC BimmerPost Supporting Vendor Drives: E92 M3 VF Supercharged, 135i Join Date: Feb 2011 Location: Philadelphia, PA Posts: 786 iTrader: (0)	VAC Motorsports \| 335i Billet Finned Differential Cover 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. Since 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) require slight modifications to OEM chassis bracing: 3 longer bolts are required, and only the Street Cover will clear this chassis. -As always, Made in the USA in house at VAC Baffled vent: __________________ Authorized STOCKING dealer: JRZ Suspension, Nitron Suspension, VF Engineering, Active Autowerke, Brembo, Forgeline, Quaife, OS Giken, Schrick, Arrow, CP, Carrillo, Tilton, ARP, Cometic, Pectel, AIM Sports, VP fuel/meth. Est. 1984 \| Follow us on Facebook! \| VAC Blog \| mike@vacmotorsports.com \| AIM: MichaelAMalloy Last edited by Mike@VAC; 09-06-2012 at 04:36 PM.
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12-27-2012, 10:16 PM	#5
Mike@VAC BimmerPost Supporting Vendor Drives: E92 M3 VF Supercharged, 135i Join Date: Feb 2011 Location: Philadelphia, PA Posts: 786 iTrader: (0)	Hey guys, Unfortunately, large pumpkin (AT or MT) only for now. It is not a direct fit with convertibles. __________________ Authorized STOCKING dealer: JRZ Suspension, Nitron Suspension, VF Engineering, Active Autowerke, Brembo, Forgeline, Quaife, OS Giken, Schrick, Arrow, CP, Carrillo, Tilton, ARP, Cometic, Pectel, AIM Sports, VP fuel/meth. Est. 1984 \| Follow us on Facebook! \| VAC Blog \| mike@vacmotorsports.com \| AIM: MichaelAMalloy

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07-18-2012, 11:47 AM	#2
sutter2k Private Drives: 2010 335i Join Date: Mar 2012 Location: Willow Grove, PA Posts: 90 iTrader: (0)	You should add a link to your website from your profile.

11-28-2012, 01:41 PM	#3
jyeah Private First Class Drives: 2010 BMW 335i Join Date: Jun 2012 Location: Los Angeles Posts: 120 iTrader: (1)	Does this fit the housing for an AT LSD? I heard that there were some fitment issues with an AT?

12-27-2012, 11:50 AM	#4
808AWD325xi Ballin' out of control. Drives: 2009 BMW 335i Join Date: Jul 2007 Location: Fremont, CA Posts: 515 iTrader: (0)	Any plans to build a cover for autos with the small pumpkin?

12-28-2012, 10:31 PM	#6
jyeah Private First Class Drives: 2010 BMW 335i Join Date: Jun 2012 Location: Los Angeles Posts: 120 iTrader: (1)	Any plans for the small pumpkin in the future? Also, might want to update your webpage just in case of confusion.

12-31-2012, 05:26 PM	#7
WhiteonWheat Private First Class Drives: 2011 335i (AW e90 LCI) Join Date: Feb 2011 Location: Atlanta Posts: 186 iTrader: (2)	Will this fit my 2011 N55 e90 LCI? Thanks! -WoW