Welcome to the North American Subaru Impreza Owners Club Friday August 14, 2020
Home Forums Images WikiNASIOC Products Store Modifications Upgrade Garage
NASIOC
Go Back   NASIOC > NASIOC General > Newbies & FAQs

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. 
 
 
Thread Tools Display Modes
Prev Previous Post   Next Post Next
Old 04-21-2020, 07:33 PM   #1
someoneza
Scooby Newbie
 
Member#: 461463
Join Date: Jan 2017
Chapter/Region: BAIC
Location: San Francisco, CA
Vehicle:
2004 WRX wagon
Silver

Default Boost will not exceed 8 PSI on 2004 WRX; need help!

I have a 2004 WRX and my boost pressure will not go above 8 PSI, even with WOT, and was hoping someone could help me figure out why. I recently made the following upgrades:
Cobb high-flow cat downpipe
Grimmspeed catless up-pipe
Samco silicone intercooler hoses
XPT stage 2 tune (target boost of 18.5 PSI)
Stock intake and filter


After reading this forums endlessly, I have ruled out the two most likely culprits (I think):
- WG actuator/valve: I have confirmed that I cannot blow air through the WG actuator valve when car is off. I connected 12V to the valve, I heard a click, and I can blow air. I have also pulled the vacumm hose off the turbo outlet, connected compressed air to this hose, and watched the WG actuator arm move up to about 1/2". I then connected 12V to the WG valve, and the compressed air was released and the WG closed again. This all appears to be normal.
- Boost leaks: I have boost leak tested my entire intake from the intake elbow and found no leaks. I tested up to 15 PSI, and it takes about 10 seconds to drop to 10 PSI, and another 40 seconds to drop to 0 PSI. The only place I can hear air escaping is from my oil filler cap.

The maximum boost I can make is always between 7.9 and 8.9 PSI, which sounds suspiciously like wastegate spring pressure. However, I don't know what could be causing this, per my above test. I have also tried pulling the vacuum hose off the WG actuator nipple, and cautiously driving around, but boost still will not exceed 8 PSI. My IAM is at 16 (the highest value for this generation WRX).

I have attached a log of a recent 3rd gear pull. It includes AFR data from my AEM UEGO wideband. I am new at this, so hopefully there are some useful clues in the logs that I missed.


Link to logs: https://drive.google.com/file/d/1c93...ew?usp=sharing
someoneza is offline   Reply With Quote
 

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

All times are GMT -4. The time now is 06:48 AM.


Powered by vBulletin® Version 3.7.0
Copyright ©2000 - 2020, Jelsoft Enterprises Ltd.
Powered by Searchlight © 2020 Axivo Inc.
Copyright ©1999 - 2019, North American Subaru Impreza Owners Club, Inc.

As an Amazon Associate I earn from qualifying purchases.