E90Post
 


 
BMW 3-Series (E90 E92) Forum > E90 / E92 / E93 3-series Powertrain and Drivetrain Discussions > N54 Turbo Engine / Drivetrain / Exhaust Modifications - 335i > Boost leak from divert valve seal leak



Reply
 
Thread Tools Search this Thread
      02-12-2012, 12:48 AM   #1
Ghoti
Second Lieutenant
 
Ghoti's Avatar
 
Drives: 335i
Join Date: Aug 2011
Location: Vancouver

Posts: 263
iTrader: (0)

Boost leak from divert valve seal leak

Something to keep in mind when you think you have boost leak...

I had recently installed a FMIC, following which I had significant boost leak (boost max'd at ~10 psi, but should have been around 18-19 with the COBB). After the shop checked the clamps associated with the FMIC a couple times and performed smoke tests, they finally traced the problem to leaking diverter valve seals.

After removing the diverter valves and cleaning the seals, everything works great. Max boost is now 19+ psi.
__________________
SG e92 335i 6MT / Cobb S2+ Agg / ETS FMIC / BMS DCI / AR DPs / AE Performance Quad / Eibach Pro-Kit / Painted Grill / Aero Lip / M3 Skirts / M-Tech Rear / DD Diffuser / Painted Reflectors / UUC Evo3 SSK + RK6A-L knob + DSSR / BK BR05 18s / LUX H8 V3 / Coding
e36 M3 ... gone but not forgotten
Ghoti is offline   Canada
0
Reply With Quote
      02-12-2012, 01:24 AM   #2
nitehawk
Lieutenant Colonel
 
nitehawk's Avatar
 
Drives: e92 335i 6MT
Join Date: May 2011
Location: Toronto

Posts: 1,624
iTrader: (15)

Garage List
Quote:
Originally Posted by Ghoti View Post
Something to keep in mind when you think you have boost leak...

I had recently installed a FMIC, following which I had significant boost leak (boost max'd at ~10 psi, but should have been around 18-19 with the COBB). After the shop checked the clamps associated with the FMIC a couple times and performed smoke tests, they finally traced the problem to leaking diverter valve seals.

After removing the diverter valves and cleaning the seals, everything works great. Max boost is now 19+ psi.
Interesting. So you didn't actually need to replace anything. Just clean and reinstall?

I'm also on factory diverter valves without issues on Cobb S2+ Agg
nitehawk is offline   Canada
0
Reply With Quote
      02-12-2012, 02:02 AM   #3
Ghoti
Second Lieutenant
 
Ghoti's Avatar
 
Drives: 335i
Join Date: Aug 2011
Location: Vancouver

Posts: 263
iTrader: (0)

Quote:
Originally Posted by nitehawk View Post
Interesting. So you didn't actually need to replace anything. Just clean and reinstall?

I'm also on factory diverter valves without issues on Cobb S2+ Agg
Yes, just clean and reinstall. It took the tech about an hour to diagnose and complete.
__________________
SG e92 335i 6MT / Cobb S2+ Agg / ETS FMIC / BMS DCI / AR DPs / AE Performance Quad / Eibach Pro-Kit / Painted Grill / Aero Lip / M3 Skirts / M-Tech Rear / DD Diffuser / Painted Reflectors / UUC Evo3 SSK + RK6A-L knob + DSSR / BK BR05 18s / LUX H8 V3 / Coding
e36 M3 ... gone but not forgotten
Ghoti is offline   Canada
0
Reply With Quote
      02-12-2012, 12:28 PM   #4
Bagelfast
Lieutenant Colonel
 
Bagelfast's Avatar
 
Drives: BMW
Join Date: Sep 2008
Location: USA

Posts: 1,537
iTrader: (0)

Interesting, what exactly did they clean inside of the diverter valves? or just the seals and seal area themselves?
Bagelfast is offline  
0
Reply With Quote
      02-14-2012, 12:18 AM   #5
Ghoti
Second Lieutenant
 
Ghoti's Avatar
 
Drives: 335i
Join Date: Aug 2011
Location: Vancouver

Posts: 263
iTrader: (0)

Quote:
Originally Posted by 1LUMI335 View Post
Interesting, what exactly did they clean inside of the diverter valves? or just the seals and seal area themselves?
My understanding is they just cleaned the seals and the seal area. I think the tech mentioned that the valves weren't fully seating themselves due to a buildup of something.
__________________
SG e92 335i 6MT / Cobb S2+ Agg / ETS FMIC / BMS DCI / AR DPs / AE Performance Quad / Eibach Pro-Kit / Painted Grill / Aero Lip / M3 Skirts / M-Tech Rear / DD Diffuser / Painted Reflectors / UUC Evo3 SSK + RK6A-L knob + DSSR / BK BR05 18s / LUX H8 V3 / Coding
e36 M3 ... gone but not forgotten
Ghoti is offline   Canada
0
Reply With Quote
      02-14-2012, 07:53 AM   #6
BMWsky
Major
 
Drives: 335i
Join Date: Dec 2010
Location: Webster NY

Posts: 1,244
iTrader: (1)

I'd keep an eye on them as some have the propensity to pop off more than others.
BMWsky is offline   United_States
0
Reply With Quote
      02-14-2012, 08:38 AM   #7
skim7x
Use it or Lose it
 
skim7x's Avatar
 
Drives: 335i e92
Join Date: Sep 2006
Location: Clifton, NJ

Posts: 2,461
iTrader: (4)

Garage List
2007 335i  [5.00]
Yeah I'm on cobb stg2+fmic with stock diverter valves and charge pipe without any problems...
__________________
'07 Space Gray 335i coupe w/ Sports Package | Comfort Access

Cobb S1+ | PTF e30 custom tune | AMS | CP-e | BMS OCC | Quaife
[Newark Photoshoot #1]
skim7x is offline   United_States
0
Reply With Quote
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
Forum Jump


All times are GMT -5. The time now is 12:30 PM.




e90post
Powered by vBulletin® Version 3.7.0
Copyright ©2000 - 2014, 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