Tag Archives: bms

BMW N54 Fuel Upgrade: Precision Raceworks Fuel Pump & Port Injection Kit

After installing MMP Stage 3 turbos on my BMW 135i, I needed an upgraded fuel system to get the most power out of the car. I was filling up with an E40 mix of 93 and E85 , but my HPFP couldn’t keep up and my old stage 1 inline LPFP was inadequate. I needed something that could handle straight E85 fuel and not run out of pressure at 700+whp.

Having good experiences with Robert at Precision Raceworks, I decided to go with his Stage 3+ Modular Fuel Pump Kit and opted for the upgraded fuel feed line and PNP harness. This would take care of my LPFP issues. I also purchased the PR/MMP Port Injection Kit at the same time to help my HPFP.

The products arrived quickly and were packaged nicely. I’ve always been satisfied with the quality from Precision Raceworks for the price. Upgraded fuel feed line not pictured.

Precision Raceworks Stage 3+ Fuel Pump and Port Injection Kit

The first step was to install the upgraded Stage 3+ bucket that had two Walbro 450s stuffed inside. Robert was nice enough to assemble the fuel pumps in a core bucket for me to swap out. Usually you have to modify your stock bucket while mounting and wiring up the pump yourself. I jumped in the back seat and got to work.

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BMW 135i – BMS Dual Cone Intake Install (N54)

Last week, I scored a used BMS Dual Cone Intake kit on 1Addicts for only $25 shipped! It was just too good of a price to pass up. When I opened the box, I found a pair of very dirty white filters. I regret not taking pictures of them because they almost looked black.

After soaking them with degreaser and rising them off, they looked brand new again! A couple minutes in the sun and they were dry. Then I grabbed a can of K&N filter oil and sprayed a nice coat on top. To my surprise, the oil was red! My precious white filters were no longer white! Oh well… they still look great.

BMW 135 - BMS dual cone intake

BMS claims that these puppies add at least 15HP to the wheels. I’m not sure how accurate that is but the sound is intoxicating! I had no problems with the K&N panel filter in the OEM airbox, but I read that it can be restrictive at higher boost levels. For only $25, I couldn’t go wrong with these. A quick test run proved that the car pulls great and sounds much better. Plus, I like the look of these under the hood.

BMS Dual Cone Intake dyno chart

BMW 135i – BMS Oil Catch Can Install (N54)

When I bought the car, it came with a Riss Racing oil catch can. Good news, right? Well, not so much. After realizing how small the lines were, I couldn’t stop thinking about it. Why wouldn’t they utilize the large lines that the stock PCV system had? Plus, it’s mounted on the hot side, right on top of the turbos! Definitely a re-branded eBay part.

Riss Racing oil catch can

Anyways, I bought a BMS OCC because it’s built from the ground up specifically for this car. It’s hoses exceed the OEM PCV piping in diameter and that flow rate is maintained throughout the entire catch can ensuring no excessive crankcase pressure buildup. Unlike the Riss Racing can, the BMS version is mounted on the cold side underneath the cowl for a stealthy look. Holding the two, the BMS oil catch can is the winner, hands down. Gotta love Terry’s products.

BMS oil catch can hoses BMS oil catch can

Much better. The hoses are nice and thick and you can’t even see it once the cowl is back on. Very happy with the upgrade.

BMW 135i – Fuel-It Stage 1 Fuel Pump Install (N54)

I ordered Steve’s Walbro 255 inline fuel pump kit so I could run up to 100% E85 for more power. The factory LPFP could handle a smaller mix of E85, but it was maxed out at that. I met up with Bob for help with the install. He has installed the pump before and also has the flashing tools and software. We installed the pump this weekend and flashed the ECU with a free E85-specific flash that BMS offers.

BMW 135i ready for install

First step: remove the fuel pump bucket from under the rear seats…

BMW 135i fuel pump location

As you can see in the picture above, we unplugged the connections first. I didn’t take any pictures of the actual removal process. It’s fairly straightforward if you follow Steve’s instructions. Here it is, removed:

BMW 135i fuel bucket

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BMW 135i – BMW JB4 Install (N54)

I finally pulled the trigger on JB4 and decided to order the BMS clutch stop at the same time. Both products arrived in a few days and I installed them right away.

When I bought the car, the previous owner told me it had some sort of JB tune that was wired inline with the MAP sensor. After doing some research, I thought he was referring to JB+ which would increase boost an additional 2-5psi for an extra 20HP.

Before I could install JB4, I had to remove the JB+ chip that I thought was in the car. I removed the whole intake assembly but found no trace of the chip. I assumed the previous owner lied about it and continued on with the JB4 installation. Once I popped the ECU box open, I saw wires with electrical tape and some sort of aftermarket box with a toggle switch connected to it.

jb3

Since I was confused, I posted up a few pictures on N54tech and Terry identified it as a really old version of a pin-out JB3 tuner. The toggle switch was in the “off” position, so he advised me to carefully remove the harness and plug the wires back into the factory ECU connectors.

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