Welcome to the North American Subaru Impreza Owners Club Sunday November 29, 2020
Home Forums Images WikiNASIOC Products Store Modifications Upgrade Garage
NASIOC
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.







* 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 11-20-2020, 04:21 PM   #1
Conster102
Scooby Newbie
 
Member#: 519178
Join Date: Oct 2020
Unhappy Reverted to stock airbox and AFR's are trash

2003 usdm wrx 5mt hatchback. It was running a garbage plastic k&n air intake with no tune when I bought it so I went back to stock airbox so my AFR's would go back to normal but this was not the case.

My only MOD is a grimmspeed decatted uppipe. Got a smoke test no vacuum leaks nor exhaust leaks nor CEL's. I have 2 logs one of me chilling under 3k rpms and one of me flooring it in 2nd gear. People tell me you can have a decatted uppipe with no tune so I do not understand what is going on.

I have recently changed oil, replaced AFR sensor in the exhaust manifold, cleaned my MAF, replaced both front cv's and it was recent adding the grimmspeed uppipe.

Do I need to tune it? If so what would you recommend? There is less backpressure so that would make me run rich anyway right? But my AFR correction is positive 25 meaning its running lean so I am confused. Also I do NOT have a wideband is that a necessity when looking at AFR's even with a mostly stock car.

Logs: https://drive.google.com/file/d/1nA8...ew?usp=sharing -cruisin
https://drive.google.com/file/d/1Va2...ew?usp=sharing - WOT

Also I am a noob so feel free to correct me on anything I assumed here

Last edited by Conster102; 11-20-2020 at 04:27 PM. Reason: I don't have a wideband
Conster102 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 06:12 PM.


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.