EGR System

joefocker20 · 03-28-2003, 02:48 AM

Has anyone removed this? Would it help or hinder performance? Also, would emissions be a problem?

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Legacy777 · 03-28-2003, 09:42 AM

You would probably pass without it. It's mainly there to help emissions in the morning.

It passes exhaust gasses back into the intake to help the car warm up faster.

They are notorious for getting gunked up though with more miles....

Mulder · 03-29-2003, 12:02 AM

Actually, what EGR does is to lower NOx emissions by reducing combustion temperature. It has nothing to do with warmup and in fact it generally does not operate until the engine is up to temperature.
Engines with EGR do unfortunately tend to get significant carbon buildup in the intake, however one advantage of having it is that because it lowers the combustion temperatures it also reduces the tendency to knock, allowing for more aggressive timing.
You can't just remove or disconnect it- you will get a CEL, and most likely some detonation since the timing maps are designed for the EGR being in place.
Passing emissions without EGR would not be an issue with an idle test since the EGR does not operate at idle. On a dyno test the lack of EGR would cause an increase in NOx emissions which may or may not be a problem depending on the limits in the particular state and the overall condition of the car and emission system still in place.

joefocker20 · 03-29-2003, 04:56 AM

Ok, old cars didnt have it, and If I had my ECU retuned with it ripped out, would it be a plus or negative?

Legacy777 · 03-29-2003, 07:25 PM

hmmmm.....I must be thinking of something else then....

HndaTch627 · 03-30-2003, 01:53 PM

joefocker-your car has no EGR system

mulder-you are 100% correct. Good info sir.

jeremy

03-28-2003, 02:48 AM	#1
joefocker20 Scooby Specialist Member#: 13745 Join Date: Dec 2001 Chapter/Region: RMIC Location: Colorado Springs, CO Vehicle: 2004 STI Silver	EGR System Has anyone removed this? Would it help or hinder performance? Also, would emissions be a problem? * Registered users of the site do not see these ads.

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03-28-2003, 09:42 AM	#2
Legacy777 Scooby Guru Member#: 4800 Join Date: Mar 2001 Chapter/Region: TXIC Location: Houston, Tx Vehicle: 1990 Legacy & 97 OBS AWD 5MT EJ22T AWIC Swap	You would probably pass without it. It's mainly there to help emissions in the morning. It passes exhaust gasses back into the intake to help the car warm up faster. They are notorious for getting gunked up though with more miles....

03-29-2003, 12:02 AM	#3
Mulder Trust no one Moderator Member#: 11170 Join Date: Oct 2001 Chapter/Region: Tri-State Location: NYC Vehicle: 02 WRX 05 GTO/11 Sonata(!)	Actually, what EGR does is to lower NOx emissions by reducing combustion temperature. It has nothing to do with warmup and in fact it generally does not operate until the engine is up to temperature. Engines with EGR do unfortunately tend to get significant carbon buildup in the intake, however one advantage of having it is that because it lowers the combustion temperatures it also reduces the tendency to knock, allowing for more aggressive timing. You can't just remove or disconnect it- you will get a CEL, and most likely some detonation since the timing maps are designed for the EGR being in place. Passing emissions without EGR would not be an issue with an idle test since the EGR does not operate at idle. On a dyno test the lack of EGR would cause an increase in NOx emissions which may or may not be a problem depending on the limits in the particular state and the overall condition of the car and emission system still in place.

03-29-2003, 04:56 AM	#4
joefocker20 Scooby Specialist Member#: 13745 Join Date: Dec 2001 Chapter/Region: RMIC Location: Colorado Springs, CO Vehicle: 2004 STI Silver	Ok, old cars didnt have it, and If I had my ECU retuned with it ripped out, would it be a plus or negative?

03-29-2003, 07:25 PM	#5
Legacy777 Scooby Guru Member#: 4800 Join Date: Mar 2001 Chapter/Region: TXIC Location: Houston, Tx Vehicle: 1990 Legacy & 97 OBS AWD 5MT EJ22T AWIC Swap	hmmmm.....I must be thinking of something else then....

03-30-2003, 01:53 PM	#6
HndaTch627 Scooby Guru Member#: 6551 Join Date: May 2001 Chapter/Region: MWSOC Location: Carol Stream, IL Vehicle: '01 GC8 Dinged STM '09 Concours 14 ABS Black	joefocker-your car has no EGR system mulder-you are 100% correct. Good info sir. jeremy