VAC Walnut Blaster Service | 135i/335i/535i Intake Valve Carbon Cleaning

Walnut Blaster Service for 135i/335i/535i

Price: $599  (people say dealers charge $650-$800+)

About VAC’s Walnut Blaster Service:
We use factory BMW tools to perform this job.  These tools ensure the job is done right the first time and that there is no mess.  The intake manifold is removed and all ports are cleaned with BMW factory tools and BMW approved walnut shell media.  The manifold goes back on and everything is tested/checked.


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335i and 135i Differential FAQ (No LSD, really?)

Shortly after the N54 powered 335i and 135i were released, enthusiasts and tuners wanted to ‘fix’ the lack of limited slip differential.  Making easy and abundant power was simple with the twin turbo inline 6, but putting it to the ground was not.

Enter the infamous final drive.  Open, LSD, welded, bolted, large body, small body, 3.08, 3.46 etc etc.  We will try to make sense of everything with this blog entry.

Open vs. LSD:
The 335i and 135i were not offered with a limited slip differential.  Yes, BMW sold a twin turbo, 6MT sporty car without a LSD.  No factory option, nothing.  So, owners had to rely on the aftermarket for a solution.  Initially the solution was pretty simply, till BMW switched things up on us.


LSD – limited slip differential:

Welded vs. Bolted:
Very early 6MT equipped cars had a traditional ‘bolted’ setup where the ring gear was bolted to the gear carrier.  Shortly after, the engineers in Munich decided to weld, not bolt the ring gear to the gear carrier.  Well, that complicates matters a bit!

Bolted: (we are using a bolted aftermarket diff for illustration purposes)


Master Reference Chart:

Does your car have a welded or bolted differential??
See chart above.  As you can see, the majority of 335i and 135i owners are blessed with the welded differential.  This makes adding a LSD a bit challenging, as the ring gear must be separated from the carrier carefully to ensure it can be re-used.  Very few shops can do this properly and consistently, but we pioneered the best way of performing this operation which allowed us to add a Quaife ATB etc. with no problems.

Large or small differential?
There are 2 differential (housing or ‘pumpkin’) sizes.  The table above shows which cars have which size.  So, a Quaife ATB limited slip unit designed for the 6MT large housing will not work in your 2009 335i automatic.  Fortunately, we have Quaife ATB, Wavetrac and OS Giken solutions for both the large and small differentials in stock at all times.  Here are some pics so you can see the dramatic difference:

Gear Ratios:
See chart above.  All 6MT cars were equipped with 3.08 final drive ratios.  Automatic cars had 3.46 ratios.  Note:  we have built a few 3.46 differentials for 6MT cars and the owners were thrilled.  They were willing to sacrifice top speed for an incredible power band around town :-)  Lastly, DCT equipped cars have 2.56 and diesel cars have 2.81 final drive ratios.

When you modify your N54 or N55 powered E9X or E8X, a proper differential is an essential modification if you want to put all of that power to the ground.  While it is quite confusing, I hope this entry makes it a bit easier to understand.  We have built 100s of differentials, so you can rely on our sales staff to answer any other questions you may have!

Click here to see how a 335i 135i VAC Performance Built Differential is made!

Click here to buy a 335i 135i VAC Performance Built Differential!

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e9x 1/4 Mile World Record: 10.690@129.38 VAC Motorsports E92 M3 | VF Engineering VF620

e9x 1/4Mile World Record: 10.690@129.38 VAC Motorsports E92 M3 | VF Engineering VF620


No nitrous
No meth
Stock engine
93 octane fuel
DOT approved street legal tires
Atco Raceway, Atco NJ

2008 M3
VF Engineering VF620 Supercharger Kit

VAC by Fabspeed catless exhaust
APEX 18×10 ARC-8 rear wheels
Mickey Thompson ET Streets (DOT Approved – street legal!)
ar Design Line Lock
No other mods.

This VF-Engineering VF620 kit is the real deal.   This is a stock kit…nothing more.  In addition to some serious whooping at the drag strip, we hammered it for many many sessions on Lightning and Thunderbolt at NJMP.    Please email us with any questions regarding this amazing, plug and play supercharger kit!

Pics from Atco:

M3 Post thread

Bimmerboost thread

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