Welcome to the North American Subaru Impreza Owners Club Tuesday September 23, 2014
Home Forums WikiNASIOC Products Store Modifications Upgrade Garage
NASIOC
Here you can view your subscribed threads, work with private messages and edit your profile and preferences Home Registration is free! Visit the NASIOC Store NASIOC Rules Search Find other members Frequently Asked Questions Calendar Archive NASIOC Upgrade Garage Logout
Go Back   NASIOC > NASIOC Technical > Factory 2.5L Turbo Powertrain

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.
* Registered users of the site do not see these ads.
Reply
 
Thread Tools Display Modes
Old 06-02-2010, 09:24 AM   #1
dman918
Scooby Specialist
 
Member#: 11202
Join Date: Oct 2001
Chapter/Region: MWSOC
Location: McHenry, IL
Vehicle:
2009 Infiniti G37X
Prev: 2006 STi with stuff

Default Stock turbo boost issues: few questions...

Hello everyone,
I have a 2006 STI with stock turbo. It does have a full turboback, perrin header and short ram intake. I have an AP with an etune and am running into a weird issue. At WOT, I hit only ~14-15lbs of boost (in 2nd and 3rd gear), and I was told it should be a couple more pounds than that. I do, however, hit 17lbs in 4th (at least according to my gauge - I need to log 4th gear to be 100%). Now, looking at the logs from 2nd and 3rd gear, I am hitting 100% injector duty cycles at WOT.

I was told to check for leaks, and I had two mechanics do just that (one tested by spraying around the hoses and the other did a smoke test). No leaks. I have a HKS BOV. Took it off and went back to stock but no change. I do have a new BOV/Intercooler gasket on the way just in case, but I doubt it's that since there wasn't any issues according to the leak tests the mechanics did.

I was told since there is 100% duty cycle, he thought there was a leak, but again, I can't find it. Can anyone think of anything to try? One thing recommeneded to me was a EBCS and a Walbro fuel pump, but I was wondering if that's necessary considering I'm running the stock turbo.

Anyone have suggestions or thoughts? Thanks for your help!
* Registered users of the site do not see these ads.
dman918 is offline   Reply With Quote
Old 06-02-2010, 10:15 AM   #2
48mpg
Scooby Specialist
 
Member#: 58405
Join Date: Mar 2004
Location: So.Fla.
Vehicle:
2004 Element GT65'd
Hydra, Hydramist'd STi

Default

those are inferior leak tests. with the engine running you cant hear any leaks and its only under a little vacuum. also, not all the connections are easily accessible to spray water on and look closely at.

do a proper leak test and pressurize the intake tract and then look/listen for leaks. with my experience at least, you will know pretty quickly if you have a leak and where the leak is.

i dont know if doing a leak test is the right way to find whats wrong, but if you are going to do the test, do it properly.
48mpg is offline   Reply With Quote
Old 06-02-2010, 12:26 PM   #3
dman918
Scooby Specialist
 
Member#: 11202
Join Date: Oct 2001
Chapter/Region: MWSOC
Location: McHenry, IL
Vehicle:
2009 Infiniti G37X
Prev: 2006 STi with stuff

Default

OK, I can look to have that done. Thanks. Anything anyone want to add or comment on?
dman918 is offline   Reply With Quote
Old 06-08-2010, 11:11 AM   #4
dman918
Scooby Specialist
 
Member#: 11202
Join Date: Oct 2001
Chapter/Region: MWSOC
Location: McHenry, IL
Vehicle:
2009 Infiniti G37X
Prev: 2006 STi with stuff

Default

Still need the pressure test. Just want your input on getting just a fuel pump. Worthwhile on the stock turbo? Not looking to upgrade the injectors at this point.
Thanks,
Mike
dman918 is offline   Reply With Quote
Old 06-08-2010, 01:58 PM   #5
joosky
Scooby Newbie
 
Member#: 240513
Join Date: Mar 2010
Chapter/Region: MWSOC
Location: 43015, OHIO
Vehicle:
2006 WRX, stage 2
BLACK on BLACK

Default

it wont hurt if u plan on a turbo upgrade
joosky is offline   Reply With Quote
Old 06-08-2010, 02:02 PM   #6
dman918
Scooby Specialist
 
Member#: 11202
Join Date: Oct 2001
Chapter/Region: MWSOC
Location: McHenry, IL
Vehicle:
2009 Infiniti G37X
Prev: 2006 STi with stuff

Default

I'd definitely get one if I did a turbo upgrade. However, on the stock turbo with the above mod list?
dman918 is offline   Reply With Quote
Old 06-24-2010, 10:24 AM   #7
dman918
Scooby Specialist
 
Member#: 11202
Join Date: Oct 2001
Chapter/Region: MWSOC
Location: McHenry, IL
Vehicle:
2009 Infiniti G37X
Prev: 2006 STi with stuff

Default

OK, so verified no leaks. I did change the fuel pump to a Walbro. Still low boosts. I guess the target boost on this map is 19lbs. Again, certainly not hitting anywhere near that in 2nd or 3rd. I was told my "wastegate cycle is pegged at 85%".

Should I try a restrictor pill? EBCS? Help please.
dman918 is offline   Reply With Quote
Old 06-24-2010, 02:24 PM   #8
colinsdad
Scooby Newbie
 
Member#: 214119
Join Date: Jun 2009
Smile I'm going through a similar issue...

with my forester XT- It runs/idles well, but, I'm definitely missing boost as well. I emailed Peaty (The "Modfather" on Scooby Mods) and he suggested I check my IC Y-pipe for leaks, spray the MAF out and check the BOV for leaks (on a stock application). The OTHER item I found may be an issue is the Banjo bolt on the turbo oil supply line. I know I was having issues because I started having a drop in boost following a lengthy towing session with my Forester- It has never been checked and/or changed. so, i went and purchased some Metric sockets and will remove it today. One caveat though is that I believe your bolt for the STi application is next to the DP...making it a bitch to access. Do a search on Scoobymods and here to see what you can find. Let me know what you find, as I am trying to troubleshoot my boost issues as well. Good luck!
colinsdad is offline   Reply With Quote
Old 06-26-2010, 10:37 AM   #9
dman918
Scooby Specialist
 
Member#: 11202
Join Date: Oct 2001
Chapter/Region: MWSOC
Location: McHenry, IL
Vehicle:
2009 Infiniti G37X
Prev: 2006 STi with stuff

Default

Well I am going to try an EBCS and see what happens (with revised tune, of course).
dman918 is offline   Reply With Quote
Old 07-08-2010, 11:50 AM   #10
dman918
Scooby Specialist
 
Member#: 11202
Join Date: Oct 2001
Chapter/Region: MWSOC
Location: McHenry, IL
Vehicle:
2009 Infiniti G37X
Prev: 2006 STi with stuff

Default

Looks like the ebcs did the trick. Boosting with no issues whatsoever.
dman918 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
Stock Turbo Boost Question 4thgenx42 Newbies & FAQs 17 05-15-2008 09:17 PM
04 Stock Turbo Boost question Twiztidunreal Factory 2.0L Turbo Powertrain 7 05-02-2006 02:00 AM
(SF) Putting my turbo back on - few questions, etc Stranger Bay Area Impreza Club Forum -- BAIC 1 11-28-2002 06:04 AM
The Turbo Forester.. a Few questions.. SubaruImpreza_power Forester Forum 1 10-29-2002 08:03 AM
Vishnu Turbo-Back Exhaust - Few Questions xfactor834 Factory 2.0L Turbo Powertrain 3 08-09-2002 01:55 PM


All times are GMT -4. The time now is 11:13 PM.


Powered by vBulletin® Version 3.7.0
Copyright ©2000 - 2014, Jelsoft Enterprises Ltd.
Powered by Searchlight © 2014 Axivo Inc.
Copyright ©1999 - 2014, North American Subaru Impreza Owners Club, Inc.