n54

Just curious, what is the main reason the N54 doesn't make good top end power? I read its because of head flow, they head specifically the exhaust side does not flow very well. If we theoretically increase flow somehow on an N54 head would we see WHP gains on the stock turbos up top? Not that I...

Hey all, dropped my motor at the machine shop the other day but he asked me what I want to do about about the dowels when we Drill out the 9mm holes for the arp 11mm kit. I'm not sure because I've heard about blocks cracking there after drilling out so I'd be worried to take more material to...

I want to add port Injection to my car, I bout the Precision Stage 3 LPFP dual Walbros. and it says it comes with the wiring and Hobbs Switch. Would I need a secondary fuel pump control module Aswell? or does that come with it? Do I need to buy anything else to support the ported injection? Here...

Hey guys, I've been on e90post for 12 years but I'm relatively new here and this is my first time needing technical assistance. About 6 months ago, I started getting a random/intermittent 2ABD code on about 1 in 10 warm starts. No symptoms and if I'd clear it, the codes/reduced power mode...

I'm on MHD Stg 2+, fbo on my 75k mile n54 335i and would also love to learn how to read them myself for the future. Fueling completely new, all 6 index 12 injectors, hpfp, lpfp and fpr, and new updated lpf sensor with the line, If anything is wrong I'd love to know and fix it immidiately, as...

Hey y’all New here and to forums in general but I’ve got one I can’t quite figure out and I wanted to try here for some possible help! I searched through the forums and couldn’t find anyone with quite this problem, so my apologies if someone found the solution. I have an 07 335i coupe, 157k...

I am rebuilding my engine and plan to do some upgrades. I was about to order some forged rod and pistons but I have read that forged pistons expand more to heat and would cause piston slap and increased wear when the engine is cold. So basically every day when I start up. I am staying at or...

Hi hope everybody is having a nice start to their holidays. I took the car out for a drive and it felt underpowered, like it wasn’t coming on to boost properly and then there was a misfire on the way home. Took this log but didn’t capture the misfire. Any help would be greatly appreciated...

Hello guys first i have the following mods.Catless downpipes out the turbos, secondary cats present.5"intercooler, custom alluminum chargepipe with hks, and dci's, basically FBO bov, stage2+mhd 93 oct(running 100 octane from local gas stations).Ive been going at this for a couple of months...

What up guys, I've been working heavily on my 2010 135i recently. I pulled the motor, removed the valve cover and oil pan, and was pleased to see a reasonably clean engine. However, I do hope the rest of the internals look as nice. I plan on installing JE Pistons with Molnar Rods and ARP...

Has anyone gotten theirs yet? How is it?

Hi guys so Im a total noob at forums lol. but here it goes I have a 2010 BMW 135i and the fuel pressure is all over the place. I read on here people with similar issues but they're running PI, my car is on DI only with a Helix overdrive on full e85. My current fuel setup is: Helix Overdrive...

Hi Everyone! My name is Raphy and this is my 2010 135i aka my 1M tribute. Full 1M conversion, Speedtech 6266 setup, 3 piece fikse wheels, and a bunch more! I’m on IG @raphy.v

Okay so I have a 2011 bmw 135i I blew the turbo and decided if I’m pulling the motor out that I was going to n54 swap the car to enjoy the dct a little more. What will I need to make the harness work or would I have to go with a stand-alone

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Hey everyone! Been having issues with my vehicle since the single turbo setup was complete. I have been reading through reddit's, forums, and many other websites but their is no definitive answer for my issue. I'll explain the setup the car is running to get you guys some more insight along...

Hi everyone, I came to this forum because of quality content I've found by google. I'm working right now on Z4 35is and hope to find some answers here with performance mods. Keep doing a good work!

Selling my 2007 E92 335i, 6spd MT, 700WHP. All maintenance up to date. This car is an absolute dream to drive. Feels like a stock car until you hit about 4k rpm. The sound of this car is music to your ears. The t51r mod sound is hypnotizing. The car is well built, no check engine light or codes...

I need help on where i can find a harness for bosch style shorti injectors on doc rac PI intake with fuel rail. If i cant purchase one where do i get the stuff to make my own and how do i make my own, im going maxxecu also with the pnp harness

Hello everyone, I've been lurking on these forums since I got my car, but have never actually made an account until now. I have a 2010 E61 535i xdrive with just basic bolt ons, MHD tune, and some small cosmetic enhancements (m5 style bumper etc etc). I've had so6me issues with this car over the...