E90Post
 


Extreme Power House
 
BMW 3-Series (E90 E92) Forum > E90 / E92 / E93 3-series Powertrain and Drivetrain Discussions > N54 Turbo Engine / Drivetrain / Exhaust Modifications - 335i > Under/over boost on target.....JB4



Reply
 
Thread Tools Search this Thread
      02-09-2013, 03:54 PM   #1
335i Pal
Second Lieutenant
 
335i Pal's Avatar
 
Drives: 335i Sedan
Join Date: Oct 2010
Location: Ohio

Posts: 284
iTrader: (1)

Under/over boost on target.....JB4

I have been having some issues with my car the last few months where I am not getting full boost and have checked the vacuum lines...nothing wrong there. I have yet to check the boost pressure, which is not the easiest thing. But I don't think that is the issue, wouldn't I keep losing boost the longer I have the issue? So far everything is staying steady. But doing some research I couldn't find out on the jb4 what the under/over boost on target function did or how to read it. Assuming if it is always in the middle I am good, under WOT I only get to about 1/4 range

I have checked codes and I have the fuel pump plausibility code and just last week I had a cylinder 5 misfire code. Thinking my fuel pump might be going out again, would this keep me from getting full boost?

2007 e90 335i
93 octane always
BMS DCI
JB4 G5 iso Map 5
__________________
335i E90 | BMS DCI | Black Matte Grill | JB4 | Logic 7 | Sport | Premium | Cold |
335i Pal is offline   United_States
0
Reply With Quote
      02-09-2013, 06:26 PM   #2
335i Pal
Second Lieutenant
 
335i Pal's Avatar
 
Drives: 335i Sedan
Join Date: Oct 2010
Location: Ohio

Posts: 284
iTrader: (1)

Forgot to mention I can not get over 12psi....if I'm lucky.
__________________
335i E90 | BMS DCI | Black Matte Grill | JB4 | Logic 7 | Sport | Premium | Cold |
335i Pal is offline   United_States
0
Reply With Quote
      02-12-2013, 04:20 PM   #3
335i Pal
Second Lieutenant
 
335i Pal's Avatar
 
Drives: 335i Sedan
Join Date: Oct 2010
Location: Ohio

Posts: 284
iTrader: (1)

No one have any info on the under/over boost feature?
__________________
335i E90 | BMS DCI | Black Matte Grill | JB4 | Logic 7 | Sport | Premium | Cold |
335i Pal is offline   United_States
0
Reply With Quote
      02-12-2013, 04:26 PM   #4
Jeff@TopGearSolutions
BimmerPost Supporting Vendor

 
Jeff@TopGearSolutions's Avatar
 
Drives: C6 Z06, GSXR-750, 09 335i
Join Date: Dec 2008
Location: TopGearSolutions.com

Posts: 15,541
iTrader: (30)

Send a message via AIM to Jeff@TopGearSolutions
We would need logs...

Move your coilpack to Cylinder 6, see if the misfire moves, that won't cause a boosting problem unless you go into limp mode.

The only way you can have a boost problem is if you have a leak. (assuming your tune is fine, which it should be).

There are several vac/boost lines on this car, including under the engine cover, near the intake manifold, near the boost canisters by the turbo's. Any could have hairline fracture or leaking under boost.

The car will throw an underboost code if you go wide open throttle for 4 seconds and underboost. (30FF underboost code). Charge pipe connection before and after the intercooler also need to be checked.

If you have any aftermarket FMIC or charge pipe they are usually the culprit 9/10 times.
Jeff@TopGearSolutions is offline   United_States
0
Reply With Quote
      02-13-2013, 12:06 PM   #5
robc1976
DIYER
 
robc1976's Avatar
 
Drives: E90 335i
Join Date: Mar 2012
Location: Illinois

Posts: 3,756
iTrader: (9)

Check you selonoids, mine did exactly as you are stating...I will post before and after logs.
__________________
JB4 G5, WEDGE flash, Walbro 455 LPFP, HFS-4 meth kit 4-AN SS lines, BMS OCC, RB turbos W/3.5 N20 sensor, RB valve, BMS DCI, 3" AR Dps, Custom OC W/ SS lines, ER FMIC, ER CP W/HKS BOV, M3 control arms W/upgraded bushings, M3 Strut Brace, M3 front sway, Meyle HD tie-rods, HPA rear toe arms, Wavetrac LSD, DEFIV kit, Ohlins R/T Cois W/12KG swift springs, Power-Flex subframe bushings, stoptech rotors, Rogue Tranny Mounts, Morr VS8.2 rims 245/295
robc1976 is offline  
0
Reply With Quote
      02-13-2013, 12:13 PM   #6
Goofyguy
GoofBall
 
Drives: 2013 Escape Ecoboost 4x4
Join Date: Jun 2012
Location: Tampa, FL

Posts: 605
iTrader: (1)

Quote:
Originally Posted by robc1976 View Post
Check you selonoids, mine did exactly as you are stating...I will post before and after logs.
How do I do this. My car isnt getting over 7psi regardless of Map.
__________________
Goofyguy is offline   United_States
0
Reply With Quote
      02-13-2013, 12:18 PM   #7
robc1976
DIYER
 
robc1976's Avatar
 
Drives: E90 335i
Join Date: Mar 2012
Location: Illinois

Posts: 3,756
iTrader: (9)

Quote:
Originally Posted by Goofyguy View Post
How do I do this. My car isnt getting over 7psi regardless of Map.
if that is case you have a huge boost leak....check the following:

1. Charge pipe to throttle body "c clip" may not be seated
2. intercooler connections
3. Brake booster line is plugged in correctly
Check lines that go from break booster vacuum lines under the valve cover and go to vacuum canisters (I replaced mine with silicone vacuum lines.
__________________
JB4 G5, WEDGE flash, Walbro 455 LPFP, HFS-4 meth kit 4-AN SS lines, BMS OCC, RB turbos W/3.5 N20 sensor, RB valve, BMS DCI, 3" AR Dps, Custom OC W/ SS lines, ER FMIC, ER CP W/HKS BOV, M3 control arms W/upgraded bushings, M3 Strut Brace, M3 front sway, Meyle HD tie-rods, HPA rear toe arms, Wavetrac LSD, DEFIV kit, Ohlins R/T Cois W/12KG swift springs, Power-Flex subframe bushings, stoptech rotors, Rogue Tranny Mounts, Morr VS8.2 rims 245/295
robc1976 is offline  
0
Reply With Quote
      02-13-2013, 12:21 PM   #8
Goofyguy
GoofBall
 
Drives: 2013 Escape Ecoboost 4x4
Join Date: Jun 2012
Location: Tampa, FL

Posts: 605
iTrader: (1)

Im thinking its intercooler connections. My front end was rearranged by a deer a month ago. I just got the car back yesterday. I can hear a ton of air movement but I dont know what to start with. The body shop did a great job on the car, but I just cant bring it back to them as they didnt know much about the car. So Im going to tackle this one. The paint matches, the lines are straight, no over spray anywhere. Just a huge boost leak somewhere.
__________________
Goofyguy is offline   United_States
0
Reply With Quote
      02-13-2013, 12:40 PM   #9
Jeff@TopGearSolutions
BimmerPost Supporting Vendor

 
Jeff@TopGearSolutions's Avatar
 
Drives: C6 Z06, GSXR-750, 09 335i
Join Date: Dec 2008
Location: TopGearSolutions.com

Posts: 15,541
iTrader: (30)

Send a message via AIM to Jeff@TopGearSolutions
All you need to then is get under the car and see if pipes are not attached.

One going in to intercooler and one going out.

The intercooler may have been damaged and they did not know, this would cause an excessive boost leak and would require you to replace it.

You will need to remove the under paneling on the bottom of the car to get a good look.

Otherwise you need to check the remainder of piping post intercooler to your charge pipe which leads to the intake manifold.

If this is out of your league I would suggest bringing it to a competent shop or dealer.

There are way too many areas to cause a boost leak and without any of us looking at the car we are just guessing.
Jeff@TopGearSolutions is offline   United_States
0
Reply With Quote
      02-13-2013, 01:03 PM   #10
Goofyguy
GoofBall
 
Drives: 2013 Escape Ecoboost 4x4
Join Date: Jun 2012
Location: Tampa, FL

Posts: 605
iTrader: (1)

Quote:
Originally Posted by Jeff@TopGearSolutions View Post
All you need to then is get under the car and see if pipes are not attached.

One going in to intercooler and one going out.

The intercooler may have been damaged and they did not know, this would cause an excessive boost leak and would require you to replace it.

You will need to remove the under paneling on the bottom of the car to get a good look.

Otherwise you need to check the remainder of piping post intercooler to your charge pipe which leads to the intake manifold.

If this is out of your league I would suggest bringing it to a competent shop or dealer.

There are way too many areas to cause a boost leak and without any of us looking at the car we are just guessing.
Brand new intercooler. I can get a few pounds so its got to be something in the system with a small tear I would assume. Im going to get it on a lift in about an hour. I was just looking for situations that people have run into.

Found it, hole about the 8mm in the charge pipe before the intercooler. Found it quick. Gave me good areas to start.
__________________

Last edited by Goofyguy; 02-13-2013 at 02:36 PM.
Goofyguy is offline   United_States
0
Reply With Quote
      02-13-2013, 04:27 PM   #11
335i Pal
Second Lieutenant
 
335i Pal's Avatar
 
Drives: 335i Sedan
Join Date: Oct 2010
Location: Ohio

Posts: 284
iTrader: (1)

I have checked all the vacuum lines and they are good. Checked the boost tubes and everything seemed solid( did not do a pressure or smoke test). If it is the solenoids wouldn't the vacuum lines not hold pressure?

That's why I am thinking there may be a fuel pump issue.
__________________
335i E90 | BMS DCI | Black Matte Grill | JB4 | Logic 7 | Sport | Premium | Cold |
335i Pal 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 11:04 AM.




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