Welcome to the North American Subaru Impreza Owners Club Tuesday October 21, 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 > Engine Management & Tuning > UTEC

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 05-21-2006, 03:45 PM   #1
bcblues
Scooby Specialist
 
Member#: 17256
Join Date: Apr 2002
Chapter/Region: MWSOC
Location: America's Outback
Vehicle:
04 STi
Blue w/ custom bug splat

Default UTEC + ABC on 04 STi = Not hitting target boost.

I have been playing around quite a bit with my 04 STi/UTEC, and I can't seem to hit target boost higher than 16-17 psi, regardless of the CLB values (which I have varied as much as +50, as high as 430), and regardless of the ABC setting.

When I screw in the ABC to close it off, and open it a turn or two, I run 12-13 psi. But I can unscrew it until the top of the set screw is coming out of the ABC body (10-15 turns??), and I still only see 16-17 psi max (except for boost spiking).

I have checked the install repeatedly, and all the lines appear correct, no leaks as far as I can tell. The only thing that has me a bit confused is the "brass restrictor" that is supposed to be in the compressor side line of the factory T-fitting hosing. I just had my stock turbo replaced with another stock turbo (straight from Subaru), and it came with all the vacuum lines installed. The stock vacuum lines DID NOT have any restrictor in the compressor side of the T-fitting (nor anywhere else). I am familiar with the factory restrictors, having experimented with the 3/16 replacement on my 02 WRX years ago. But this factory setup does not contain a restrictor.

Any ideas?
* Registered users of the site do not see these ads.
bcblues is offline   Reply With Quote
Old 05-22-2006, 12:41 PM   #2
SloRice
Scooby Specialist
 
Member#: 44351
Join Date: Sep 2003
Chapter/Region: MWSOC
Location: Cincinnati, OH
Vehicle:
2004 Mitsubishi Evo
701whp 9.91@146

Default

You need the restrictor else you won't make the b00st!
SloRice is offline   Reply With Quote
Old 05-22-2006, 01:01 PM   #3
AaronWRX
Scooby Specialist
 
Member#: 7194
Join Date: Jun 2001
Chapter/Region: MAIC
Location: NoVa
Vehicle:
2011 997.2 Turbo
Black

Default

the restrictor is really hard to feel. It may be there.

other then that, maybe you have a boost leak?

Maybe your boost solenoid isnt working or isntl plugged in?

Put all 1's in your boost map, if your boost solenoid clicks like a mad-man, then your boost control solenoid is getting power. (still doesnt mean its working right though)

p.s. I have yet to see a STI that needed the ABC.
AaronWRX is offline   Reply With Quote
Old 05-22-2006, 07:15 PM   #4
cpasti
Scooby Newbie
 
Member#: 50582
Join Date: Dec 2003
Default

Are you using the remote map selector? Make sure both maps show up the same on your dashboard when you are tuning, the first time mine was tuned, somehow they were reading differently and we weren't adjsuting the map we thought was operating, but were going by the switch indicator. Kept opening up the ABC as well with no effect. Once we saw the discrepancy and figured we were adjusting the wrong map, it was obvious why boost wasn't increasing.

I have an 04 STI and had to use the ABC to make the boost I wanted, but went as high as 21-22 psi on race gas. My ABC needed 3 turns open and values across the board of 500 to do it.
cpasti is offline   Reply With Quote
Old 05-23-2006, 08:00 AM   #5
bcblues
Scooby Specialist
 
Member#: 17256
Join Date: Apr 2002
Chapter/Region: MWSOC
Location: America's Outback
Vehicle:
04 STi
Blue w/ custom bug splat

Default

I have carefully checked the factory hoses, and there is no restrictor. These are brand new factory hoses that came with my new turbo from Subaru.

I can boost up to 17-18 psi in higher gears with a long pull. But in 1st and 2nd, I rarely hit 14 psi, even on hard pulls.

I am running the ABC, and have unscrewed the allen screw until it is backed out of the body of the ABC about half way. I did not count turns, but it must be about 15. When screwed in and backed off 3 turns, I run wastegate pressures.

UTEC dashboard confirms that the map selector switch is actually running my selected map (both switch and map are reading the same, correct number).

Assuming that somehow Subaru provided my local dealer with a new stock STi turbo that did not come with the restrictor, how do I go about getting one? I have heard that they are no longer available.
bcblues is offline   Reply With Quote
Old 05-23-2006, 10:06 AM   #6
AaronWRX
Scooby Specialist
 
Member#: 7194
Join Date: Jun 2001
Chapter/Region: MAIC
Location: NoVa
Vehicle:
2011 997.2 Turbo
Black

Default

Wirelessly posted (xv6700 EVDO: Mozilla/4.0 (compatible; MSIE 4.01; Windows CE; PPC; 240x320))

Quote:
Originally Posted by bcblues
I have carefully checked the factory hoses, and there is no restrictor. These are brand new factory hoses that came with my new turbo from Subaru.

I can boost up to 17-18 psi in higher gears with a long pull. But in 1st and 2nd, I rarely hit 14 psi, even on hard pulls.

I am running the ABC, and have unscrewed the allen screw until it is backed out of the body of the ABC about half way. I did not count turns, but it must be about 15. When screwed in and backed off 3 turns, I run wastegate pressures.

UTEC dashboard confirms that the map selector switch is actually running my selected map (both switch and map are reading the same, correct number).

Assuming that somehow Subaru provided my local dealer with a new stock STi turbo that did not come with the restrictor, how do I go about getting one? I have heard that they are no longer available.
I switcthed to a perrin ebcs and loved it. knowing what i know now, if i were in shoes i wouldn't bother with troublesooting this further and would switch to a perrin ebcs or GM solenoid and enjoy consistent boost with the lines you already have.
AaronWRX is offline   Reply With Quote
Old 05-25-2006, 03:10 AM   #7
Smoby
Scooby Specialist
 
Member#: 97642
Join Date: Oct 2005
Chapter/Region: SWIC
Location: Phoenix, AZ
Vehicle:
2002 Wrx Sedan
MBP

Default

Look into the gm boost solenoid.

Also, the restrictors are still available. I bought two a couple months ago for around three bucks a piece. If you cant find one I still have an extra one sitting around somewhere.
Smoby 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
Not hitting target boost on Gabedude's stage 1 map NJ2.5RS Open Source Reflashes 19 08-12-2010 01:05 AM
SZ55 STI wont hit target boost, not EVEN CLOSE! Cstmboxermotorsports Factory 2.5L Turbo Powertrain (EJ Series Factory 2.5L Turbo) 31 01-23-2009 02:02 PM
not hitting target boost, or boost reading is not accurate? toxin AccessPort 5 08-24-2008 08:22 PM
ideas on why i'm not hitting target boost "searched" 04 Slo Sti Factory 2.5L Turbo Powertrain (EJ Series Factory 2.5L Turbo) 2 06-22-2008 10:09 PM
Not hitting target boost on stage 1 map Mr.Krinkle Commercial ECU Reflashes 18 06-16-2007 06:04 PM


All times are GMT -4. The time now is 11:21 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.