Welcome to the North American Subaru Impreza Owners Club Wednesday December 12, 2018
Home Forums WikiNASIOC Products Store Modifications Upgrade Garage
Go Back   NASIOC > NASIOC Technical > Engine Management & Tuning

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. 
Thread Tools Display Modes
Old 01-22-2010, 10:22 AM   #1
Scooby Newbie
Member#: 193628
Join Date: Nov 2008
Chapter/Region: E. Canada
Location: Canada
2010 STI

Default Stock o2 reading concerns.

Ive got a wideband in my other car that I will be borrowing once summer rolls around again and the cars come out of storage. In the meantime last summer I checked out what the stock o2 reads under full load, Its at 11.8.. Now I have heard that the stock o2 is way off and now Im concerned that the engine could be too lean.

I have a keen ear for detonation and I have not heard any. Im always listening for it.

Thoughts on the 11.8 reading on the stock o2?
* Registered users of the site do not see these ads.
Franko is offline   Reply With Quote
Sponsored Links
* Registered users of the site do not see these ads.
Old 01-22-2010, 10:55 AM   #2
Scooby Guru
Member#: 70395
Join Date: Sep 2004
Chapter/Region: MAIC
Location: Da-boonies,Va

Why don't you just worry about it once you have put the wideband on the car and go by that info? If you search you will find plenty of info on the stock O2 sensor.
quazimoto is online now   Reply With Quote
Old 01-22-2010, 02:38 PM   #3
Scooby Guru
Member#: 118209
Join Date: Jun 2006
Chapter/Region: MWSOC
Location: North Dakota
2015 WRX Limitec


the ecu ignores the stock o2 sensor 100% at WOT. if the ecu ignores it, it is safe for you to ignore it also. (as you figured out, not really accurate outside of closed loop conditions)
rkramer is offline   Reply With Quote
Old 01-22-2010, 08:18 PM   #4
Scooby Guru
Member#: 140444
Join Date: Feb 2007
Chapter/Region: NWIC
Location: Near Seattle, WA
05 Stage Free LGT


Check this out: http://www.iwsti.com/forums/cobb-str...lots-data.html

However, if you have an aftermarket downpipe with a bung between the turbo and the cat, you can put the stock sensor there. This gets it out of the high EGBP of the up-pipe, and allows it to read much closer to reality. However it still won't read lower than 11.1 or so. I've done this and so have a few other people.

Note that this may only apply to cars with 32-bit ECUs. I have heard that the sensor used by the 16-bit ECUs is the same, but I've also heard that it's different, so I dunno.
NSFW 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

Similar Threads
Thread Thread Starter Forum Replies Last Post
UTEC Q: does UTEC intercept stock O2 sensor readings? happasaiyan Engine Management & Tuning 6 12-10-2004 01:29 PM
Wastegate dump and O2 readings Mancini Engine Management & Tuning 4 04-23-2003 01:28 PM
Rear o2 readings. Midwayman Engine Management & Tuning 5 09-22-2002 03:26 PM
A/F Readings, O2 Readings? Diranged Factory 2.0L Turbo Powertrain (EJ Series Factory 2.0L Turbo) 1 06-24-2002 09:03 PM
dealer suggested O2 reading instead of egt bingo Factory 2.0L Turbo Powertrain (EJ Series Factory 2.0L Turbo) 6 06-03-2002 10:04 PM

All times are GMT -4. The time now is 06:53 PM.

Powered by vBulletin® Version 3.7.0
Copyright ©2000 - 2018, Jelsoft Enterprises Ltd.
Powered by Searchlight © 2018 Axivo Inc.
Copyright ©1999 - 2017, North American Subaru Impreza Owners Club, Inc.