Welcome to the North American Subaru Impreza Owners Club Monday September 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 12-26-2011, 02:12 PM   #1
randysubie
Scooby Newbie
 
Member#: 301788
Join Date: Nov 2011
Chapter/Region: South East
Vehicle:
2012 wrx
lr

Default af/r question

my friend had me watch his af/r on his ap and at idle it was like 11... but when cruising if he let off throttle it goes to 20.4 and will stay there until he gets on throttle??? isnt that extremely lean
* Registered users of the site do not see these ads.
randysubie is offline   Reply With Quote
Old 12-26-2011, 02:59 PM   #2
2Fast4U1DAY
Scooby Specialist
 
Member#: 250152
Join Date: Jun 2010
Chapter/Region: MAIC
Location: Pennsylvania
Vehicle:
2006 WRX Limited
OBP

Default

Quote:
Originally Posted by randysubie
my friend had me watch his af/r on his ap and at idle it was like 11... but when cruising if he let off throttle it goes to 20.4 and will stay there until he gets on throttle??? isnt that extremely lean
It's not a problem. The injectors turn off upon decel, and the engine becomes a big air pump. It draws air in and pumps it out without any combustion taking place, so seeing afr's in the 20's is absolutely normal.
2Fast4U1DAY is offline   Reply With Quote
Old 12-26-2011, 03:18 PM   #3
randysubie
Scooby Newbie
 
Member#: 301788
Join Date: Nov 2011
Chapter/Region: South East
Vehicle:
2012 wrx
lr

Default af/r

Quote:
Originally Posted by 2Fast4U1DAY View Post
It's not a problem. The injectors turn off upon decel, and the engine becomes a big air pump. It draws air in and pumps it out without any combustion taking place, so seeing afr's in the 20's is absolutely normal.
thanks! he was concerned about it.
randysubie is offline   Reply With Quote
Old 12-28-2011, 11:28 AM   #4
Cobb Tuning
NASIOC Vendor
 
Member#: 4803
Join Date: Mar 2001
Location: Austin, DFW, Portland, SOCAL
Default

Quote:
Originally Posted by randysubie View Post
my friend had me watch his af/r on his ap and at idle it was like 11... but when cruising if he let off throttle it goes to 20.4 and will stay there until he gets on throttle??? isnt that extremely lean
As mentioned, the ~20:1 on lift-throttle is normal, but it shouldn't be 11:1 at idle. What mods does your friend have and what map is he running?

Bill
Cobb Tuning 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
narrowband af/r question scuba scooby Electrical & Lighting 6 10-27-2010 03:52 PM
af gauge question mikeb01453 New England Impreza Club Forum -- NESIC 1 04-21-2009 06:02 PM
af question leftho0k Pre-2002 Factory Turbo Powertrain 6 01-16-2009 09:05 AM
going lean on af question westazoo Engine Management & Tuning 11 10-12-2006 09:29 PM
A/F Input/AF IN question With Perfect Power Bobert540 Engine Management & Tuning 5 10-24-2005 07:12 PM


All times are GMT -4. The time now is 03:41 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.