Welcome to the North American Subaru Impreza Owners Club Thursday April 25, 2024
Home Forums Images WikiNASIOC Products Store Modifications Upgrade Garage
NASIOC
Go Back   NASIOC > NASIOC Technical > Engine Management & Tuning

Welcome to NASIOC - The world's largest online community for Subaru enthusiasts!
Welcome to the NASIOC.com Subaru forum.

You are currently viewing our forum as a guest, which gives you limited access to view most discussions and access our other features. By joining our community, free of charge, you will have access to post topics, communicate privately with other members (PM), respond to polls, upload content and access many other special features. Registration is free, fast and simple, so please join our community today!

If you have any problems with the registration process or your account login, please contact us.







* As an Amazon Associate I earn from qualifying purchases. 
* Registered users of the site do not see these ads. 
Reply
 
Thread Tools Display Modes
Old 11-25-2010, 07:35 PM   #1
DrBelmore
Scooby Newbie
 
Member#: 254057
Join Date: Aug 2010
Chapter/Region: MWSOC
Location: Milwaukee, WI
Vehicle:
2002 WRX

Default Car wont boost over 10psi

Hi I have a 02 bugeye hybrid with vf39, grimmspeed ebcs, and all supporting mods. I have been boosting 19psi at 11.4:1 AFR with no problems. Then all of a sudden one day I was getting on the freeway and I hit on it and it stuttered for a second and then kept going (19psi). Well I get off the freeway and boosted it in first, right when the boost was getting over 10psi the pressure started going all crazy like 13psi, 17, 15, 18, 14, 19. And my AFR's went down to 10:1. Also the motor started stuttering and was kind of shaking (and it was back firing from going so rich). Then I let off and the car drove fine as long as I dont go over 10psi. I tried the same thing in second gear and it did the same exact thing. I did a 20psi boost leak test and heard no leaks. I took off the TMIC tightened all the clamps, checked all the couplers/gaskets and found nothing.

What do you guys think it could be?

Thanks
Eric
* Registered users of the site do not see these ads.

Last edited by DrBelmore; 12-03-2010 at 04:48 PM.
DrBelmore is offline   Reply With Quote
Sponsored Links
* Registered users of the site do not see these ads.
Old 11-26-2010, 08:55 AM   #2
quazimoto
Scooby Guru
 
Member#: 70395
Join Date: Sep 2004
Chapter/Region: MAIC
Location: Da-boonies,Va
Default

If your using the factory boost control system sounds like the motor detonated pretty bad and the ECU dropped boost and timing. Post a datalog.
quazimoto is offline   Reply With Quote
Old 11-26-2010, 11:39 AM   #3
DrBelmore
Scooby Newbie
 
Member#: 254057
Join Date: Aug 2010
Chapter/Region: MWSOC
Location: Milwaukee, WI
Vehicle:
2002 WRX

Default

Quote:
Originally Posted by quazimoto View Post
If your using the factory boost control system sounds like the motor detonated pretty bad and the ECU dropped boost and timing. Post a datalog.
Oh sorry I should of added that but I am on the Grimmspeed boost solenoid.
DrBelmore is offline   Reply With Quote
Old 11-26-2010, 06:23 PM   #4
quazimoto
Scooby Guru
 
Member#: 70395
Join Date: Sep 2004
Chapter/Region: MAIC
Location: Da-boonies,Va
Default

Doesn't mater. The ECU is still controlling the boost. Post a datalog or find out what the IAM is.
quazimoto is offline   Reply With Quote
Old 11-26-2010, 10:52 PM   #5
gotsugg
Scooby Specialist
 
Member#: 204014
Join Date: Feb 2009
Chapter/Region: South East
Location: Little Rock
Vehicle:
02 02 WRB Bugeye
GTX3582 front mount turbo

Default

If 10psi is all it will boost, it sounds like you are running spring pressure at your IWG. Could be an issue with you EBC. That doesn't explain the shaking and rich AFRs though.
gotsugg is offline   Reply With Quote
Old 11-27-2010, 09:51 AM   #6
quazimoto
Scooby Guru
 
Member#: 70395
Join Date: Sep 2004
Chapter/Region: MAIC
Location: Da-boonies,Va
Default

Or the engine is knocking repeatedly and the ECU has decided to run wastegate boost.
quazimoto is offline   Reply With Quote
Old 12-03-2010, 10:37 AM   #7
DrBelmore
Scooby Newbie
 
Member#: 254057
Join Date: Aug 2010
Chapter/Region: MWSOC
Location: Milwaukee, WI
Vehicle:
2002 WRX

Default

Well I don't have a computer right now that I can datalog but I am still having the same problem. When I slowly give the motor boost, right when I start getting around 8 psi I start hearing tons of fluttering almost like it's the wastegate but it sounds louder then the wastegate. But when I check for boost leaks I cant hear anything leaking.

Last edited by DrBelmore; 12-03-2010 at 04:34 PM.
DrBelmore is offline   Reply With Quote
Old 12-03-2010, 04:43 PM   #8
DrBelmore
Scooby Newbie
 
Member#: 254057
Join Date: Aug 2010
Chapter/Region: MWSOC
Location: Milwaukee, WI
Vehicle:
2002 WRX

Default

Anyone have any ideas?
DrBelmore is offline   Reply With Quote
Old 12-03-2010, 05:37 PM   #9
GrimmSpeed
NASIOC Vendor
 
Member#: 136396
Join Date: Jan 2007
Chapter/Region: MWSOC
Location: Minneapolis, MN
Vehicle:
2020 STI, 2022 WRX

Default

Hey, I do not think our valve is operating incorrectly BUT we just had this same scenario happen, check your wiring connections to the valve, while they are tough if it has been yanked around at all they can break loose. Double check these wires and report back!

Will
GrimmSpeed is offline   Reply With Quote
Old 12-03-2010, 06:22 PM   #10
DrBelmore
Scooby Newbie
 
Member#: 254057
Join Date: Aug 2010
Chapter/Region: MWSOC
Location: Milwaukee, WI
Vehicle:
2002 WRX

Default

Quote:
Originally Posted by GrimmSpeed
Hey, I do not think our valve is operating incorrectly BUT we just had this same scenario happen, check your wiring connections to the valve, while they are tough if it has been yanked around at all they can break loose. Double check these wires and report back!

Will
Sounds good. I will check it in the morning. Thanks

Eric
DrBelmore is offline   Reply With Quote
Old 02-22-2024, 03:22 PM   #11
steagalarus
Scooby Newbie
 
Member#: 535693
Join Date: Oct 2023
Default

Did you fix the issue?
Can't go above 15psi boost when I was previously able to get to 22-23.
21 WRX
steagalarus is offline   Reply With Quote
Old 02-22-2024, 04:55 PM   #12
Mulder
Trust no one
Moderator
 
Member#: 11170
Join Date: Oct 2001
Chapter/Region: Tri-State
Location: NYC
Vehicle:
02 RAV4 MT
15 WRX/11 CRZ

Default

OP hasn't been on this site in almost 10 years.
Mulder is offline   Reply With Quote
Old 04-02-2024, 03:50 PM   #13
steagalarus
Scooby Newbie
 
Member#: 535693
Join Date: Oct 2023
Default

Sadness, I really need to fix my problem
steagalarus is offline   Reply With Quote
Old 04-18-2024, 06:00 PM   #14
Zackvbra
Scooby Newbie
 
Member#: 537738
Join Date: Apr 2024
Default

Quote:
Originally Posted by steagalarus View Post
Sadness, I really need to fix my problem
Check wastegate duty under boost. If you have an issue with your wastegate it could just be making whatever the mechanical boost limit for the turbo is.
Zackvbra is offline   Reply With Quote
Reply

Thread Tools
Display Modes

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

Similar Threads
Thread Thread Starter Forum Replies Last Post
WRX 2.0 wont boost over 4lbs TPPERFORMANCE Factory 2.0L Turbo Powertrain (EJ Series Factory 2.0L Turbo) 18 07-02-2010 12:47 PM
Car wont rev over 5000 RPM, pulled Map sensor and cars fine.... Please help!!! Cautionjump Factory 2.0L Turbo Powertrain (EJ Series Factory 2.0L Turbo) 3 06-08-2007 11:45 PM
wont boost over 5psi v8eaterWRX Factory 2.0L Turbo Powertrain (EJ Series Factory 2.0L Turbo) 8 12-25-2006 06:06 PM
wont boost past 10psi mtxfrk2k1 Normally Aspirated with bolt-on Forced Induction Powertrain 10 04-02-2006 04:01 AM
HELP!Car wont get over 3800 rpm? 4CEFED6 Factory 2.0L Turbo Powertrain (EJ Series Factory 2.0L Turbo) 27 08-19-2002 10:23 AM

All times are GMT -4. The time now is 12:47 AM.


Powered by vBulletin® Version 3.7.0
Copyright ©2000 - 2024, Jelsoft Enterprises Ltd.
Powered by Searchlight © 2024 Axivo Inc.
Copyright ©1999 - 2019, North American Subaru Impreza Owners Club, Inc.

As an Amazon Associate I earn from qualifying purchases.

When you click on links to various merchants on this site and make a purchase, this can result in this site earning a commission
Affiliate programs and affiliations include, but are not limited to, the eBay Partner Network.