Welcome to the North American Subaru Impreza Owners Club Tuesday July 22, 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 > AccessPort

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 03-16-2007, 11:49 AM   #1
verdee
Scooby Newbie
 
Member#: 113772
Join Date: Apr 2006
Chapter/Region: RMIC
Location: Denver
Vehicle:
2006 WRX Wagon vf39
WRB

Default 2006 WRX Target Boost and Altitude

I have a stage 2 2006 Wrx with a Cobb catted downpipe and an SPT Catback exhaust. I have been running this setup for about 2 months. The question I have, is what should I expect for boost. I live in Denver, so I am expecting to be lower than Cobb's targets. Right now I do not see higher that 14psi. I have checked this both with my boost guage and the AP reading. I have tightened the wastegate arm (At first I was only hitting about 11psi). I just want to see if this is normal, or if there is something else I should do. The car runs great and pulls hard, but I just want ot make sure its OK.

Evan
* Registered users of the site do not see these ads.
verdee is offline   Reply With Quote
Old 03-16-2007, 11:57 AM   #2
06rexwagon
Scooby Specialist
 
Member#: 114730
Join Date: May 2006
Chapter/Region: SWIC
Location: Albuquerque, NM
Vehicle:
2006 WRX Limited Wag
9.9@142

Default

Depending on barometric pressure, you will only see a fraction of what the targets are. I am at the same elevation as you, and with our barometric pressure, the ECU automatically targets ~12% reduction in boost, so about .88*15.6=13.8. You can target a higher boost to make it hit 15.6, but tightening your wastegate arm isn't the answer. The ECU WANTS to hit a reduced boost target and will do whatever it can to do it, including lowering your wastegate duty cycles depending on the turbo dynamics tables. All that being said, your car is doing what is supposed to do.
06rexwagon is offline   Reply With Quote
Old 03-16-2007, 01:30 PM   #3
Airboy
Scooby Specialist
 
Member#: 72829
Join Date: Oct 2004
Chapter/Region: W. Canada
Location: Calgary, Canada
Vehicle:
2006 WRX
MHI-TF06-18K

Default

The atmospheric pressure compensation for the '06 WRX is ~-13% at 12.2psi (5000ft). However, this value is applied to the boost target in absolute pressure. So, Boost target of 15psi gauge is actually stored in the ECU as 29.7psi (actual unit is mmHg but anyways). At 5000ft elevation, the target becomes 25.9psi MAP. Subtracting atmospheric pressure of 12.2psi and you get 13.7psi gauge pressure.

Airboy is offline   Reply With Quote
Old 03-16-2007, 05:33 PM   #4
verdee
Scooby Newbie
 
Member#: 113772
Join Date: Apr 2006
Chapter/Region: RMIC
Location: Denver
Vehicle:
2006 WRX Wagon vf39
WRB

Default

Thanks a lot, makes a lot more sense now.
verdee 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
Under target boost and lean afr jtmarsh AccessPort 2 02-23-2010 07:43 PM
2006 WRX Stock Boost pAnC8K3 Newbies & FAQs 7 12-11-2006 07:35 AM
2006 WRX AccessPort boost question??? Bala AccessPort 9 05-12-2006 12:54 PM
2006 wrx tr boost D Town WRX Factory 2.5L Turbo Powertrain 18 03-30-2006 11:32 PM
2006 WRX stock boost/VAC levels jkoc Factory 2.5L Turbo Powertrain 8 02-12-2006 06:27 PM


All times are GMT -4. The time now is 09:43 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.