Tag Archives: 135i

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 N54 FMIC Upgrade: VRSF 7.5″ Race Intercooler

After installing my new fuel system and turning up the boost on my MMP Stage 3 turbos, I started to notice some really bad heat soak in my logs. Guessing that the car is around 600-650whp at 28PSI, I could see that my standard VRSF 7″ Street intercooler was no longer keeping up. It did a great job on my stock turbos, but I needed something a little bigger.

After doing some research, I found the VRSF 7.5″ Race intercooler. Judging by its size and efficiency ratings, it seemed like the perfect intercooler for my power goal of 700whp. I ordered it right away to help cool things down a bit. Four days later it showed up, very nicely packaged.

Continue reading BMW N54 FMIC Upgrade: VRSF 7.5″ Race Intercooler

BMW N54 Clutch Upgrade: SPEC Stage 3+ with MFactory SMFW

If you’ve been following my website, you probably read my detailed post about installing a 335is/550i clutch after my OEM clutch wore out. However, with MMP Stage 3 turbos on the way, I knew the 335is clutch wouldn’t hold as I turned up the boost. With a goal of 700whp, I decided to replace it with a SPEC Stage 3+ clutch and retain my MFactory single mass flywheel.

SPEC Stage 3+ Clutch

Since I just installed an MFactory SMFW about 20k miles ago, I decided to reuse it because I knew it was in good condition.  All I had to do was purchase a SPEC Stage 3+ clutch with OEM or MFactory flywheel configuration so it would mate up properly. If I didn’t already have the MFactory flywheel, I probably would’ve bought a SPEC flywheel to go with the clutch. However, I’d rather save some money when possible!

Since the transmission was going to be removed, I wanted to refresh a few things at the same time. I noticed my shifter developed some side-to-side slop so I decided to upgrade the bushings. The car has almost 120k miles and still has the OEM transmission mounts, so I knew those could be replaced. I’ve also never servied the rear differential and noticed it was seeping a tiny bit of fluid. Might as well replace the rear pinion seal and flush/refill the fluid!

Continue reading BMW N54 Clutch Upgrade: SPEC Stage 3+ with MFactory SMFW

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

BMW 135i – FBO Stock Turbo Dyno Results (N54)

Late Model Throttle was hosting a dyno day at their shop in Waukesha, Wisconsin. Knowing that there would be a DynoJet and some cool cars, I decided to sign up!

The car was strapped on and put down 448whp and 501wtq with SAE correction. However, all of the N54 guys use STD correction and that converts to about 468whp and 523wtq!

BMW 135i Dyno Results

Continue reading BMW 135i – FBO Stock Turbo Dyno Results (N54)

BMW 135i or 335i Exhaust with MHD Burble Option

With MHD’s latest release of the “burble” exhaust option, I had to try it out. You only need a few things to make this happen.

Simply download the app, plug the flashing cable into the car and connect the OTG cable to the tablet. Then you can flash a map with your desired burble settings.

I have the burble option set to full aggressive. I have catless downpipes and a full catless exhaust with only one muffler. Take a listen… Continue reading BMW 135i or 335i Exhaust with MHD Burble Option

BMW 135i (FBO) – 1/2 Mile Trap Speed & Races

As some of you know, I was at the NoFlyZone Midwest event this past weekend. Got almost 25 passes in. The first day was rained out, but we got a few solo runs. Going 146mph in the rain is… interesting.

The weather on the second day was much better and I was able to clock a 156 MPH run!

1/2 Mile NoFlyZone Trap Speed

Here is a compilation video of some cars I was able to run…

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