BMW 1 Series Coupe Forum / 1 Series Convertible Forum (1M / tii / 135i / 128i / Coupe / Cabrio / Hatchback) (BMW E82 E88 128i 130i 135i)
 





 

Post Reply
 
Thread Tools Search this Thread
      06-26-2015, 11:26 PM   #1
loesch
Captain
loesch's Avatar
United_States
71
Rep
914
Posts

Drives: 2011 BMW 135i M Sport
Join Date: Feb 2012
Location: State College, PA

iTrader: (4)

DIY: Locating boost leaks in N55

First, I do not claim to be an expert by any means. This is just an account based on my experience.

So how did I come to the conclusion that I have a boost leak? The first thing that I noticed was that I was not hitting targets, especially at higher RPMs. I saw some other people with logs showing 17psi at 6,000rpms so I figured something wasn't right. Also, PWM spikes almost immediately to 99. This shouldn't happen at lower RPMs like this.


Newguy123 was a big help as he pointed me to the company that puts together a tester that works perfectly for the N55. http://turboboostleaktesters.com/n55-engine-all-models/. It's a very nicely put together tool. Just make sure they send 2 clamps with it. Mine first showed up with just the one so I couldn't attach it to the inlet tube. They were great about it and sent another one to me right away though.

This tester is a must for us. Pure has said that 90% of the cars they get in their shop have some sort of leak. That says it all.

Starting the test

First, Remove the under body plastics so you can get a friend to help find leaks while you have the system under pressure. This is super easy and just requires the removal of several bolts.

1, Unclip the intake from the airbox. If you have the stock intake then unclip the top part of the airbox. You might be able to get away with leaving it but I would just remove the clips to make things less prone to breaking.
2, Loosen the flat head screw on the worm clamp shown in the image below. Squeeze and pull the intake free
3, 4, Remove the 2 screws that hold in the EGR fitting. Carefully pull it straight up and out.
5, Remove the 10mm bolt that secures the intake tube.

Now remove the intake tube.


Now you have access to the mounting point for the boost leak tester shown below.


Remove the rubber gasket from the turbo inlet tube. In this instance I have the Pure inlet tube but it should be the same procedure for the stock inlet tube.


Pre-tighten the bottom clamp on the boost leak tester until it won't fall off. Align it as shown in the pictures below...




Now seat the tester onto the flange of the turbo inlet tube and tighten the clamp to secure it.


Get out your air compressor fill to about 25psi. You don't want too much because you want to add pressure to the system gradually. Attach the air hose. You will use a standard tire inflator tool. Now REMOVE THE OIL CAP!! This helps to let the crankcase pressure escape to save your seals. Slowly add air until the tester gauge reads about 3 - 5 psi. At this point you may already find your leak. You'll hear air hissing and can feel around and listen to see where it's coming from. As you fix your leak(s), keep increasing the pressure slowly until about 20psi on the tester. In my case the air was escaping from the hot side charge pipe at only about 4psi. I had thought it was goodentight but apparently not.


While I was in there I also decided to empty my catch can. Always a good idea to do that every once in a while. I had a good bit of watery grossness to dispose of.
__________________
2011 135i M Sport 6MT LeMans Blue | Active Autowerke Gen II axle back | Berk d******* | N54 gutted mids | FuelIt Walbro 450 fuel pump | Pure Turbos Stage 2 | 3.5bar TMAP | Pure Turbos inlet pipe | BMS intake | BMS oil catch can | ETS intercooler | ETS charge pipe | BMS JB4 w/ ISO firmware | BMS backend flash stacked on PPK | Eibach springs | Whiteline rear subframe bushing inserts | cosmetic tidbits
Appreciate 1
      06-26-2015, 11:35 PM   #2
loesch
Captain
loesch's Avatar
United_States
71
Rep
914
Posts

Drives: 2011 BMW 135i M Sport
Join Date: Feb 2012
Location: State College, PA

iTrader: (4)

Reserved for results once leaks are all gone and the car is logged.
__________________
2011 135i M Sport 6MT LeMans Blue | Active Autowerke Gen II axle back | Berk d******* | N54 gutted mids | FuelIt Walbro 450 fuel pump | Pure Turbos Stage 2 | 3.5bar TMAP | Pure Turbos inlet pipe | BMS intake | BMS oil catch can | ETS intercooler | ETS charge pipe | BMS JB4 w/ ISO firmware | BMS backend flash stacked on PPK | Eibach springs | Whiteline rear subframe bushing inserts | cosmetic tidbits
Appreciate 0
      08-03-2015, 11:10 PM   #3
Jerich0
Love to Drive
56
Rep
389
Posts

Drives: X4 & M4
Join Date: Jul 2009
Location: Around

iTrader: (0)

Any updates on this?
Appreciate 0
      08-09-2015, 01:28 PM   #4
loesch
Captain
loesch's Avatar
United_States
71
Rep
914
Posts

Drives: 2011 BMW 135i M Sport
Join Date: Feb 2012
Location: State College, PA

iTrader: (4)

Sorry. Not really. Funny thing is that my logs look almost exactly the same after fixing this leak. I'm not sure if another leak occurred or what.
__________________
2011 135i M Sport 6MT LeMans Blue | Active Autowerke Gen II axle back | Berk d******* | N54 gutted mids | FuelIt Walbro 450 fuel pump | Pure Turbos Stage 2 | 3.5bar TMAP | Pure Turbos inlet pipe | BMS intake | BMS oil catch can | ETS intercooler | ETS charge pipe | BMS JB4 w/ ISO firmware | BMS backend flash stacked on PPK | Eibach springs | Whiteline rear subframe bushing inserts | cosmetic tidbits
Appreciate 0
      05-23-2016, 04:43 PM   #5
Ganque
N55 w/DCT
Ganque's Avatar
Mexico
11
Rep
53
Posts

Drives: 2013 135i M Sport
Join Date: Jun 2015
Location: Mexico

iTrader: (0)

Quick question. What's the diameter size of the pipe where you put on the Boost leak tester? Or even better, what's the diameter of your boost leak tester on both sides? I want to make my own since I live in Mexico and the site charges me 50 USD for just shipping that thing.
Appreciate 0
      06-05-2016, 10:37 PM   #6
loesch
Captain
loesch's Avatar
United_States
71
Rep
914
Posts

Drives: 2011 BMW 135i M Sport
Join Date: Feb 2012
Location: State College, PA

iTrader: (4)

3"
Appreciate 0
      06-19-2016, 10:33 PM   #7
harkes
Captain
harkes's Avatar
China
186
Rep
829
Posts

Drives: M135i, NSX and AE86
Join Date: Apr 2014
Location: Xiamen, China

iTrader: (0)

Hi Loesch

Are you still a few psi short up top - like me? I have been trying to trouble shoot a dozen times over the last 6months, but no success so far.

I am comparing my lack of boost to this log from Peter...I am starting to think that his log was just run in at colder temperatures - hence the turbo can make more boost. The F-series turbo inlet is different so I deviced a leak tester myself from a plumbing cap
Attached Images
 
__________________
bootmod3 and JB4'ed M135i PWG
(A Dane in China)
Appreciate 0
      06-19-2016, 10:54 PM   #8
loesch
Captain
loesch's Avatar
United_States
71
Rep
914
Posts

Drives: 2011 BMW 135i M Sport
Join Date: Feb 2012
Location: State College, PA

iTrader: (4)

Quote:
Originally Posted by harkes View Post
Hi Loesch

Are you still a few psi short up top - like me? I have been trying to trouble shoot a dozen times over the last 6months, but no success so far.

I am comparing my lack of boost to this log from Peter...I am starting to think that his log was just run in at colder temperatures - hence the turbo can make more boost. The F-series turbo inlet is different so I deviced a leak tester myself from a plumbing cap
I went Stage 2 so definitely no shortage up top now.

Your log looks pretty much the same as mine on the stage 1 at its best.
Appreciate 0
      06-20-2016, 12:44 AM   #9
harkes
Captain
harkes's Avatar
China
186
Rep
829
Posts

Drives: M135i, NSX and AE86
Join Date: Apr 2014
Location: Xiamen, China

iTrader: (0)

Quote:
Originally Posted by loesch View Post
I went Stage 2 so definitely no shortage up top now.

Your log looks pretty much the same as mine on the stage 1 at its best.
Haha - that is also a way to fix it

God knows I would love a Stg2, just cannot justify it for city driving with 2x 200usd shipping and 30% import tax so just want to get the most from the stg1.
__________________
bootmod3 and JB4'ed M135i PWG
(A Dane in China)
Appreciate 0
      09-09-2016, 06:35 PM   #10
sw1183
Private First Class
sw1183's Avatar
United_States
12
Rep
131
Posts

Drives: 2011 E90 335xi
Join Date: Mar 2012
Location: Indianapolis, IN

iTrader: (1)

Garage List
2011 BMW 335xi  [0.00]
Hey Loesch,

Running the test on an identical PS2 turbo, intake, etc. I disconnect my oil catch can and I can hear air hissing from the oil cap removal and the line going to BMS OCC at around 7-12psi. Is this normal?
Appreciate 0
Post Reply

Bookmarks

Thread Tools Search this Thread
Search this Thread:

Advanced Search

Posting Rules
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is Off


All times are GMT -4. The time now is 01:09 PM.




1addicts
Powered by vBulletin® Version 3.7.0
Copyright ©2000 - 2017, Jelsoft Enterprises Ltd.
1Addicts.com, BIMMERPOST.com, E90Post.com, F30Post.com, M3Post.com, ZPost.com, 5Post.com, 6Post.com, 7Post.com, XBimmers.com logo and trademark are properties of BIMMERPOST