Welcome to the North American Subaru Impreza Owners Club Tuesday September 30, 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 > Normally Aspirated 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 07-03-2003, 05:40 PM   #1
yebokmj
Scooby Specialist
 
Member#: 2213
Join Date: Aug 2000
Chapter/Region: South East
Location: Raymond, NH USA
Vehicle:
1995 Impreza w/EJ257
Brilliant Red

Default Cross post: EGR removal with stock ECU

I want to remove my EGR from my 2.5 engine but I want to know if I just plug the selnoid and leave it if that will be sufficent. Wayne/wac used some stuff to try and avoid the code on his car but his was a 2.2 using a 2.5 ECU and never had the EGR selinoid to just leave in place. Any input before I do this would be apprecited.
Joshua.
yebokmj is online now   Reply With Quote
Old 07-03-2003, 05:43 PM   #2
Legacy777
Scooby Guru
 
Member#: 4800
Join Date: Mar 2001
Chapter/Region: TXIC
Location: Houston, Tx
Vehicle:
1990 Legacy & 97 OBS
AWD 6MT EJ22T AWIC Swap

Default

You just need to find out what the resistance of the solenoid valve is when it's normal, and try to wire a resistor in-line to trick the ECU that it's there and ok
Legacy777 is offline   Reply With Quote
Old 07-03-2003, 05:46 PM   #3
yebokmj
Scooby Specialist
 
Member#: 2213
Join Date: Aug 2000
Chapter/Region: South East
Location: Raymond, NH USA
Vehicle:
1995 Impreza w/EJ257
Brilliant Red

Default Just leave the solenoid?

What if I just leave the solenoid won't that serve the same purpose? It's just a thing that switches on and off correct? I or does it some how know it's not controlling anything if the solenoid isnt connected to the EGR system.
Joshua
yebokmj is online now   Reply With Quote
Old 07-03-2003, 07:16 PM   #4
Mulder
Trust no one
Moderator
 
Member#: 11170
Join Date: Oct 2001
Chapter/Region: Tri-State
Location: NYC
Vehicle:
02 WRX
15 WRX/05 GTO

Default

It isn't quite this simple. If you disable the EGR you will eventually get a CEL even if the solenoid remains in place. The ECU checks to see that the EGR is functioning (not just the solenoid, it looks for changes in the 02 sensor when EGR is applied). There won't be an easy way around this without the ability to reprogram the ECU to ignore the EGR.
Also with the EGR removed you may experience some detonation. Since the EGR works to limit NOx emissions by lowering combustion temperatures, it also reduces the tendency for the engine to detonate. When the engine is designed and the ECU maps written, the presence of the EGR is taken into account.
Mulder is offline   Reply With Quote
Old 07-04-2003, 07:00 PM   #5
Legacy777
Scooby Guru
 
Member#: 4800
Join Date: Mar 2001
Chapter/Region: TXIC
Location: Houston, Tx
Vehicle:
1990 Legacy & 97 OBS
AWD 6MT EJ22T AWIC Swap

Default

Quote:
Originally posted by mulder
It isn't quite this simple. If you disable the EGR you will eventually get a CEL even if the solenoid remains in place. The ECU checks to see that the EGR is functioning (not just the solenoid, it looks for changes in the 02 sensor when EGR is applied). There won't be an easy way around this without the ability to reprogram the ECU to ignore the EGR.
Also with the EGR removed you may experience some detonation. Since the EGR works to limit NOx emissions by lowering combustion temperatures, it also reduces the tendency for the engine to detonate. When the engine is designed and the ECU maps written, the presence of the EGR is taken into account.
Just curious, how does EGR valve reduce NOx & detonation. NOx forms in high temps, high MEP, etc. Does reducing the amount of oxygen by inducing already burned gasses reduce the overall combustion temps?
Legacy777 is offline   Reply With Quote
Old 07-04-2003, 07:04 PM   #6
Mulder
Trust no one
Moderator
 
Member#: 11170
Join Date: Oct 2001
Chapter/Region: Tri-State
Location: NYC
Vehicle:
02 WRX
15 WRX/05 GTO

Default

Quote:
Originally posted by legacy777


Just curious, how does EGR valve reduce NOx & detonation. NOx forms in high temps, high MEP, etc. Does reducing the amount of oxygen by inducing already burned gasses reduce the overall combustion temps?
Yes, that's the basic function of EGR. Its primary purpose is to reduce NOx by lowering the temp, and detonation is reduced as a byproduct of those lower temps.
Mulder 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
after removing utec,stock ecu questions. Woofy Engine Management & Tuning 1 05-21-2010 03:54 PM
Cobb Stage 2 ECU for trade with stock ECU + $200 chohakai Private 'For Sale' Classifieds 1 11-13-2004 02:40 AM
Who has removed EGR, with stock ECU? yebokmj Normally Aspirated with bolt-on Forced Induction Powertrain 0 07-03-2003 05:18 PM
just how bad does car run with stock ecu and sti injectors suprasingle Factory 2.0L Turbo Powertrain 2 10-24-2002 12:54 PM
What psi/boost with stock ecu = CEL? SGOSWRX Factory 2.0L Turbo Powertrain 3 04-17-2002 08:39 PM


All times are GMT -4. The time now is 07:59 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.