Tag Archives: 335i

Doc Race Intake Manifold Installation & Dyno Results!

If you’re a diehard N54 enthusiast, you know that there are very few aftermarket intake manifolds available for us. You might also know that Doc Race has been working to produce an intake manifold since 2016.

Once mass-production was confirmed, I had to get one to match my Doc Race N54 single turbo kit. One of the reasons I wanted this intake manifold was because it integrates port injectors directly into the manifold. The typical N54 port injection method (which I currently have) involves a spacer between the engine and stock intake manifold that creates an additional surface for potential boost leaks. Not only that, but it looks awesome too!

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Continue reading Doc Race Intake Manifold Installation & Dyno Results!

The Best N54 Single Turbo Kit for BMW 335i or 135i

I tried MMP Stage 3 twin turbos, but never felt the “wow” factor I was hoping for. After worrying about wastegate rattle and smoking turbos for too long, I decided it was finally time to go big or go home. Meet the Doc Race N54 single turbo kit.

Once I decided to convert my N54 from twin turbos to a single turbo, I spend countless hours researching what kit I should go with, which parts needed to be replaced, what upgrades needed to be done, etc.

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To save you that same hassle, I saved my parts list and will share that below. With this complete list, I was able to safely make 749whp on the stock motor in my BMW 135i.

Continue reading The Best N54 Single Turbo Kit for BMW 335i or 135i

Installing my BMW N54 Single Turbo Kit

I want to kick off this post with a reminder that I’m installing the Doc Race single turbo kit outside of the car on an engine stand. Part of the reason I bought this kit was because I blew my motor which required to me remove and re-install a new motor. Great excuse to upgrade… right?!

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The kit showed up about 4 weeks after I ordered it and came complete. I didn’t want to gamble with other vendors’ long lead times and kits that arrived with missing or poor-fitting parts. Doc Race knocked it out of the park and I’m glad I chose their kit!

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Everything looked beautiful. I opted for the ceramic coating option and a ball-bearing 6266 turbo. The kit includes almost everything you need to convert to single turbo! Now let’s get these beautiful pieces where they belong…

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Manifold studs replaced, manifold, heat shield and water pipe installed.

Continue reading Installing my BMW N54 Single Turbo Kit

How To Walnut Blast Your BMW N54 / 335i / 135i

Walnut blasting is one of the most common maintenance tasks for the N54 engine to remove carbon buildup from the intake valves. Some shops or dealerships charge an arm and a leg for this service, but it can be done at home for much less!

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You’ll need the following parts & tools:


For a complete kit, ready to go (minus compressor), you can get the walnut blasting DIY kit shipped to you straight from BavAuto.

Let’s get started. First you will need to remove the intake manifold. Read this step-by-step process to complete this step.

Once the intake manifold is removed, you should watch my DIY video that will walk you through the rest of the steps!

I took some photos along the way if you need something to reference.

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And the finished results…

Before:

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After:

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I Blew Up My BMW N54 Engine – Removing & Replacing

After “sending it” at 30psi for a couple hundred miles, I developed a misfire. I narrowed it down to cylinder 3, but wasn’t sure if it was plugs, coils, injectors, etc. I swapped all accessories between cylinders, but nothing would follow. That’s when I started to get worried.

Without wasting any more time, I busted out the compression tester. The results were disappointing.

Cylinder 1: 170 psi
Cylinder 2: 170 psi
Cylinder 3: 80 psi
Cylinder 4: 170 psi
Cylinder 5: 170 psi
Cylinder 6: 170 psi

I’m not sure what exactly caused the problem, but adding a tablespoon of oil down the cylinder boosted compression back up. 99% sure it is a cracked ring or a chipped ringland. If I had to guess, the car developed a misfire but I was too greedy and stayed on the throttle while it was a misfiring for a couple pulls. Or maybe it just randomly gave up… I’ll never know why. The logs looked good before the misfire, but I knew I was playing with fire at this power level.

After saving up for a few months, I bought a used motor from a junkyard. It came out of a 2008 335i 6MT with 91,223 miles. The car was hit pretty hard on the driver’s side, so I’m not worried about flood damage or anything like that. It was also modified, so I’m hoping it was taken care of by an enthusiast.

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Continue reading I Blew Up My BMW N54 Engine – Removing & Replacing

BMW 135i – Stock Turbo N54 FBO Dyno Results

After enjoying the car for a few months, I’ve been curious what kind of power it’s actually making to the wheels. So, I went ahead and scheduled a dyno appointment.

Here is another video, with a loud backfire out of my midpipe (axleback section removed after it started rubbing).

The best numbers were 448whp and 501wtq with SAE correction. It looks like all the N54 guys use STD correction instead and that converts to about 468whp and 523wtq!

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Here are my modifications to reach this power:

TUNING
JB4 Map 6 @ 22psi + MHD BMS E85 KR flash
JB4 Tuner
JB4 Wireless Connect Kit
MHD Flashing Cable
OTG USB Adapter
Free MHD Backend Flashes

PERFORMANCE UPGRADES
Turbo Inlets
Catless Downpipes
7″ Intercooler
Charge Pipe
TiAL Blow Off Valve
Exhaust
Oil Catch Can
NGK 5992 Spark Plugs
Fuel-It Stage 1 LPFP with E60 fuel
BMS Cowl Filters
Upgraded PCV

TRANSMISSION
335is/550i Clutch Upgrade
MFactory Single-Mass Flywheel
Race Transmission Mounts
BMW Performance Short Shift Kit
Teflon Shifter Bushings
Clutch Pedal Stop
Clutch Delay Valve Delete
JB4 No-lift-shift/2-step Relay
Redline D4 ATF Transmission Fluid
Redline 75W90 Rear Differential Fluid