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 10-23-2012, 03:59 PM   #26
MRF22
Scooby Specialist
 
Member#: 210516
Join Date: May 2009
Chapter/Region: NWIC
Location: Beaverton
Vehicle:
2005 Sti
AW

Default

Quote:
Originally Posted by Wicked Innovation
Tripintaz, its the same for all 32 bit.

MRF22. Well he is wrong, so if he doesnt know how the rear o2 works, how did he tune it to not influence anything? lol.

If you have logging ability log AF Correction 3 (32 bit) and see if it has a value other than 0.

M@
I don't have logging ability.
* Registered users of the site do not see these ads.
MRF22 is offline   Reply With Quote
Old 10-23-2012, 04:54 PM   #27
Tripintaz
Scooby Specialist
 
Member#: 245218
Join Date: Apr 2010
Chapter/Region: South East
Location: FL
Vehicle:
2013 STI Limited

Default

Quote:
Originally Posted by MRF22 View Post
Ok so my tuner said he tuned it so the rear O2 sensor wasn't at play. He seems to believe that the only thing the rear is used for is making sure the cat works. I'm so confused.
So should I put the rear O2 sensor in?
Your tuner is wrong at least in this scenario. Many of the newer cars with OBD2 only use the rear O2 for catalyst efficiency monitoring. However, Subaru decided to also allow the rear O2 to influence your fuel trims. he probably thinks disabling the CEL for rear O2 was all that needs to be done. However, that only tells the ECU to not throw a code for poor catalytic converter efficiency.

You should put the rear O2 back in.

I just checked the newest version of ATR and you can tune the Rear O2's short term fuel corrections to equal 0%. I do not see anywhere that you can adjust how it affects the long term fuel trims. However, logically if there are no short term fuel trims then the ECU cannot learn any long term fuel trims from the Rear O2. It seems that changing this will eliminate the need for a rear O2. Not sure if any other tuning solutions can do this.
Tripintaz is offline   Reply With Quote
Old 10-23-2012, 05:03 PM   #28
Wicked Innovation
NASIOC Vendor
 
Member#: 265606
Join Date: Nov 2010
Location: Manchester, NH
Default

As I stated above you can do this in opensource as well by hex editing the binary directly, and it works exactly as you concluded.

Leafy says this is included in some experimental OS definitions.

This is a great topic.

M@
Wicked Innovation is offline   Reply With Quote
Old 10-23-2012, 06:00 PM   #29
MRF22
Scooby Specialist
 
Member#: 210516
Join Date: May 2009
Chapter/Region: NWIC
Location: Beaverton
Vehicle:
2005 Sti
AW

Default

Thank you all for the advice.
MRF22 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


All times are GMT -4. The time now is 08:18 AM.


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.