Welcome to the North American Subaru Impreza Owners Club Thursday March 28, 2024
Home Forums Images WikiNASIOC Products Store Modifications Upgrade Garage
NASIOC
Go Back   NASIOC > NASIOC Technical > Subaru Conversions

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. 
Reply
 
Thread Tools Display Modes
Old 01-18-2006, 12:48 AM   #1
josh...just josh
Scooby Newbie
 
Member#: 82273
Join Date: Mar 2005
Chapter/Region: MWSOC
Location: little creek naval base, VA
Vehicle:
97 impreza L
now with wrx brake love!!

Default blocking off egr; good idea or not?

i dont think that jdm subarus have an egr system so for most of you guys this wouldnt be an issue. but what if youre swapping in an usdm engine, or building a

hybrid? i know that blocking off the egr rasises combustion temps but can that be corrected with just a colder plug? i'm sure that you would show a CEl but

who cares if it doesnt hurt anything. the only things that you would have to worry about is the egr valve itself and the egr postion sensor right? you could just plug the vaccum lines up. i'm just thinking that getting rid of the egr and maybe even the evap systems you could really clean up and simplify an engine
* Registered users of the site do not see these ads.
josh...just josh is offline   Reply With Quote
Sponsored Links
* Registered users of the site do not see these ads.
Old 01-18-2006, 07:00 PM   #2
josh...just josh
Scooby Newbie
 
Member#: 82273
Join Date: Mar 2005
Chapter/Region: MWSOC
Location: little creek naval base, VA
Vehicle:
97 impreza L
now with wrx brake love!!

Default

so no one has any idea huh?
josh...just josh is offline   Reply With Quote
Old 01-19-2006, 09:39 AM   #3
suby53
Scooby Newbie
 
Member#: 59648
Join Date: Apr 2004
Chapter/Region: RMIC
Location: W.V.C.
Vehicle:
97' Legacy Outback

Default

I tore all that crap out when I swapped from my ej18 to my ej22. I used the EJ18 manifold and just built a block off plate and tore of all the hoses and plugged the vacuum ports. No cels yet and its been months and it runs great!
suby53 is offline   Reply With Quote
Old 01-19-2006, 06:55 PM   #4
josh...just josh
Scooby Newbie
 
Member#: 82273
Join Date: Mar 2005
Chapter/Region: MWSOC
Location: little creek naval base, VA
Vehicle:
97 impreza L
now with wrx brake love!!

Default

i would think that as long as you kept it in check the higher temps would even be better for turbo spool
josh...just josh is offline   Reply With Quote
Old 01-20-2006, 03:14 PM   #5
swapstar
*** Banned ***
 
Member#: 102779
Join Date: Dec 2005
Location: JDM land filling a container
Vehicle:
1998 PM if u need
JDM bits.....

Default

i blocked it off on ej28->25 swap. he was happy for 2 years.
swapstar is offline   Reply With Quote
Old 01-20-2006, 05:12 PM   #6
Lachlan
Scooby Specialist
 
Member#: 19470
Join Date: May 2002
Chapter/Region: SWIC
Location: albuquerque, NM
Vehicle:
1981 Brat GL
Blue

Default

what's an egr?
Lachlan is offline   Reply With Quote
Old 01-20-2006, 05:27 PM   #7
JessesTalon
Scooby Specialist
 
Member#: 63925
Join Date: Jun 2004
Chapter/Region: NWIC
Location: Beaverton, Oregon
Vehicle:
95 R33 / 06 WRX
Dark Slvr / Crystal Slvr

Default

your retarded if you remove EGR...


only thing egr does is improve gas mileage during light throttle/cruising conditions...


it is NEVER open during idle or full throttle....


Bottem line DO NOT REMOVE EGR...
JessesTalon is offline   Reply With Quote
Old 01-20-2006, 07:45 PM   #8
josh...just josh
Scooby Newbie
 
Member#: 82273
Join Date: Mar 2005
Chapter/Region: MWSOC
Location: little creek naval base, VA
Vehicle:
97 impreza L
now with wrx brake love!!

Default

hows does dumping exhausr gas into the intake improve gas milleage? the point of the egr is to a) reduce emissions by re-burning some of the exhuasr gases and b) reduce combustion temps. i dont know what youre talking about but i dont think that its right (i could be wrong)
josh...just josh is offline   Reply With Quote
Old 01-20-2006, 08:11 PM   #9
Natoe
Scooby Specialist
 
Member#: 90353
Join Date: Jul 2005
Chapter/Region: NWIC
Location: Corvallis OR
Vehicle:
Sold '95 22T Impreza
'99 EJ205 L, AE86 GVR4

Default

how would letting exhaust gas into the combustion chamber LOWER temps?

i thought it was a way for cold starts for the engine to warm up faster as well.

the EGR probably does help mileage, since your reburning unused fuel in the exhaust. dont worry about it, do whatever makes the swap easier for you.
Natoe is offline   Reply With Quote
Old 01-20-2006, 08:29 PM   #10
josh...just josh
Scooby Newbie
 
Member#: 82273
Join Date: Mar 2005
Chapter/Region: MWSOC
Location: little creek naval base, VA
Vehicle:
97 impreza L
now with wrx brake love!!

Default

i guess that i just want to understand it. i know that the symptoms of a bad egr is pinging and rough idle, i dont know
josh...just josh is offline   Reply With Quote
Old 01-20-2006, 08:34 PM   #11
josh...just josh
Scooby Newbie
 
Member#: 82273
Join Date: Mar 2005
Chapter/Region: MWSOC
Location: little creek naval base, VA
Vehicle:
97 impreza L
now with wrx brake love!!

Default

This was taken from another website:

Quote:
The automotive engineers figured that they needed to do something to lower the peak combustion temperatures which only occurred under certain high load driving conditions. They figured they could do so at the expense of power and fuel economy but what the heck, ya can't have everything! If they could only add something to the combustion chamber that would act like sort of a fire extinguisher to cool the combustion temperatures that would do it.

So they invented a way to allow some very inert gas to get back into the combustion chamber only when needed. They needed a source of this gas - it wasn't air, cuz that contains oxygen and nitrogen which caused the problem in the first place. So they chose carbon dioxide. Where to get a supply of carbon dioxide . . . ??? Hmmmm, how about the exhaust system?
josh...just josh is offline   Reply With Quote
Old 01-20-2006, 08:43 PM   #12
swapstar
*** Banned ***
 
Member#: 102779
Join Date: Dec 2005
Location: JDM land filling a container
Vehicle:
1998 PM if u need
JDM bits.....

Default

egr is nasty. and so is a RWD "drift-o-futo" impreza.

you'd think that if EGR improved gas milage all the JDM motors would have them.....
swapstar is offline   Reply With Quote
Old 01-20-2006, 09:33 PM   #13
XENONSVX
Scooby Newbie
 
Member#: 41719
Join Date: Aug 2003
Chapter/Region: MWSOC
Location: LANSING, MI
Vehicle:
XT, SVX, JUSTY &
GF8 STI V4 RA

Default

you can block off EGR and not have any driveability problems. You may get a CEL and you'll have problems passing emisions (if it's in your state)

I know for a fact (because there's one in my garage) that when doing a miata swap you have to disable the EGR on the new motor. Just block it off w/ a plate and call it good.

EGR is old technology, there are better systems coming out and currently in use
XENONSVX is offline   Reply With Quote
Old 01-20-2006, 10:35 PM   #14
STi-Nismo Dood
Scooby Specialist
 
Member#: 4149
Join Date: Feb 2001
Chapter/Region: SCIC
Location: Frisco/Diego/LosAngeles
Vehicle:
MY93 Impreza 6MT
GC8.6 Aspen White

Default

i have mine blocked due to the rumor that N/A to turbo swaps, you'll be getting a LOT of hot gas going into your intake manifold, thus heating up a specific piston chamber due to area of disposal. I have yet to absorb why I SHOULDN'T do this, so its still disconnected. My concern is to make all four intake manifold runners an equal temperature, if this mod won't do it, then I'll switch that 4mm tube back in...
STi-Nismo Dood is offline   Reply With Quote
Old 01-20-2006, 10:38 PM   #15
JessesTalon
Scooby Specialist
 
Member#: 63925
Join Date: Jun 2004
Chapter/Region: NWIC
Location: Beaverton, Oregon
Vehicle:
95 R33 / 06 WRX
Dark Slvr / Crystal Slvr

Default

seriously if u don't know what a egr is in the first place, DON'T MESS WITH IT...


lol


it drops temperature by adding inert gas into the combustion chamber...

you get better gas mileage cause you arn't using as much air/fuel because some of the chamber is inert gas which doesn't combust. smaller combustion = better mpg and lower emissions and lower temperature in teh combustion chamber

seriously if you guys DONT know what your talking, then don't talk at all... please
JessesTalon is offline   Reply With Quote
Old 01-20-2006, 10:43 PM   #16
STi-Nismo Dood
Scooby Specialist
 
Member#: 4149
Join Date: Feb 2001
Chapter/Region: SCIC
Location: Frisco/Diego/LosAngeles
Vehicle:
MY93 Impreza 6MT
GC8.6 Aspen White

Default

so does anyone notice the drop in the intake manifold temp. where your EGR is located after removing the hose?
STi-Nismo Dood is offline   Reply With Quote
Old 01-20-2006, 10:46 PM   #17
JessesTalon
Scooby Specialist
 
Member#: 63925
Join Date: Jun 2004
Chapter/Region: NWIC
Location: Beaverton, Oregon
Vehicle:
95 R33 / 06 WRX
Dark Slvr / Crystal Slvr

Default

egr ONLY opens at cruise...

it is NEVER on at full throttle.... so don't touch it, otherwise your going to get worse gas mileage normal driving around town, just drop it aight?
JessesTalon is offline   Reply With Quote
Old 01-20-2006, 10:53 PM   #18
Hurley 2.5 WRS
Scooby Specialist
 
Member#: 43916
Join Date: Sep 2003
Chapter/Region: RMIC
Location: Old Town
Vehicle:
2001 Impreza 4.7
Blue Ridge Pearl

Default

TAKE DAT ISH OUTTA DER!!


fuel to the fire
Hurley 2.5 WRS is offline   Reply With Quote
Old 01-21-2006, 12:01 AM   #19
Natoe
Scooby Specialist
 
Member#: 90353
Join Date: Jul 2005
Chapter/Region: NWIC
Location: Corvallis OR
Vehicle:
Sold '95 22T Impreza
'99 EJ205 L, AE86 GVR4

Default

Quote:
Originally Posted by JessesTalon
seriously if you guys DONT know what your talking, then don't talk at all... please
go home, nobody wants to hear that, everyone deletes it, no one has had any problems with deleteing it, if you love it so much then you can keep it and we wont make fun of your mom for it. older usdm and all jdm motors dont have it, its strictly emissions.
Natoe is offline   Reply With Quote
Old 01-21-2006, 12:27 AM   #20
Mulder
Trust no one
Moderator
 
Member#: 11170
Join Date: Oct 2001
Chapter/Region: Tri-State
Location: NYC
Vehicle:
02 RAV4 MT
15 WRX/11 CRZ

Default

EGR advantages- lowers combustion temps which reduces NOx emissions and reduces detonation, allowing for more aggressive ignition timing.
Disadvantages- may reduce throttle response, promotes carbon buildup in the intake. Over time and mileage the valve tends to stick and may leak, causing idle and/or driveability problems.
Most factory EM has a way of monitoring the EGR so if it is removed completely a CEL will usually result.
Mulder is offline   Reply With Quote
Old 01-21-2006, 05:38 AM   #21
swapstar
*** Banned ***
 
Member#: 102779
Join Date: Dec 2005
Location: JDM land filling a container
Vehicle:
1998 PM if u need
JDM bits.....

Default

jesse, you are being a dolt. you belong in the fan boi forum, not the conversions forum. show us some street cred and perhaps i'll ask that importer shop why you were not fit for the op.
swapstar is offline   Reply With Quote
Old 01-21-2006, 08:51 PM   #22
JessesTalon
Scooby Specialist
 
Member#: 63925
Join Date: Jun 2004
Chapter/Region: NWIC
Location: Beaverton, Oregon
Vehicle:
95 R33 / 06 WRX
Dark Slvr / Crystal Slvr

Default

if u want higher combustion chamber temp's and bad gas mileage, then be the dope and block it off...

u wont pass emissions, you'll get ****ty gas mileage, and you will have a check engine on all the time...

how is it a mod?
JessesTalon is offline   Reply With Quote
Old 01-23-2006, 05:24 PM   #23
SubaruImpreza_power
Scooby Guru
 
Member#: 13910
Join Date: Jan 2002
Chapter/Region: NESIC
Location: Greenwich, CT
Vehicle:
2005 Legacy GT
blue

Default

Quote:
Originally Posted by JessesTalon
your retarded if you remove EGR...


only thing egr does is improve gas mileage during light throttle/cruising conditions...


it is NEVER open during idle or full throttle....


Bottem line DO NOT REMOVE EGR...

Not too sure about the Full throttle.. If I'm Correct the EGR opens above 3K you can see the Suction of the engine pull it open, and the engine runs like Crap if you open it by hand.
SubaruImpreza_power is offline   Reply With Quote
Old 01-23-2006, 05:27 PM   #24
SubaruImpreza_power
Scooby Guru
 
Member#: 13910
Join Date: Jan 2002
Chapter/Region: NESIC
Location: Greenwich, CT
Vehicle:
2005 Legacy GT
blue

Default

Quote:
Originally Posted by Lachlan
what's an egr?

Exhaust Gas Recirculation

In a nutshell it takes gases that were not burnt the first time around, they go for another pass.
SubaruImpreza_power is offline   Reply With Quote
Old 01-23-2006, 06:13 PM   #25
Matt Monson
Scooby Guru
 
Member#: 832
Join Date: Jan 2000
Chapter/Region: RMIC
Location: Teh Ghetto Garage, CO
Vehicle:
99 2.5RS, '85 911
'73 914 and 2012 BRZ

Default

Quote:
Originally Posted by JessesTalon
seriously if u don't know what a egr is in the first place, DON'T MESS WITH IT...


lol


it drops temperature by adding inert gas into the combustion chamber...

you get better gas mileage cause you arn't using as much air/fuel because some of the chamber is inert gas which doesn't combust. smaller combustion = better mpg and lower emissions and lower temperature in teh combustion chamber

seriously if you guys DONT know what your talking, then don't talk at all... please
I think you may be missing the point here. On a number of the hybrid engines that some of us have been building, there is no bung for the EGR on the new heads. And thus the relevance of his question.

I have blocked this off on several engines that used non-EGR heads, but continued to use the Ej18 intake manifold and wiring harness. Or for other folks using EGR based EJ20's with different heads, but the original manifold, it would be the same. Just unplug it and block off that section of the manifold...
Matt Monson 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
Creating man made black holes - good idea or not? docwhorocks Off-Topic 84 09-09-2008 01:53 PM
Good Idea or Bad Idea stock BPV's question SatanasoSTI Factory 2.5L Turbo Powertrain (EJ Series Factory 2.5L Turbo) 18 03-29-2006 09:04 PM
good idea or bad idea? fastwrx006 Factory 2.5L Turbo Powertrain (EJ Series Factory 2.5L Turbo) 11 07-15-2005 05:23 PM
3" cat back for WRX...good idea or bad idea? JDMSubaru Factory 2.0L Turbo Powertrain (EJ Series Factory 2.0L Turbo) 49 12-24-2003 04:40 AM
Dealer rust, fabric, paint protrection. extended warantee-Good idea or not? belvista Canada Region Forum 11 12-04-2003 09:16 PM

All times are GMT -4. The time now is 11:56 AM.


Powered by vBulletin® Version 3.7.0
Copyright ©2000 - 2024, Jelsoft Enterprises Ltd.
Powered by Searchlight © 2024 Axivo Inc.
Copyright ©1999 - 2019, North American Subaru Impreza Owners Club, Inc.

As an Amazon Associate I earn from qualifying purchases.

When you click on links to various merchants on this site and make a purchase, this can result in this site earning a commission
Affiliate programs and affiliations include, but are not limited to, the eBay Partner Network.