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Old 03-28-2003, 02:48 AM   #1
joefocker20
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Member#: 13745
Join Date: Dec 2001
Chapter/Region: RMIC
Location: Colorado Springs, CO
Vehicle:
2004 STI
Silver

Default EGR System

Has anyone removed this? Would it help or hinder performance? Also, would emissions be a problem?
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Old 03-28-2003, 09:42 AM   #2
Legacy777
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1990 Legacy & 97 OBS
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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....
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Old 03-29-2003, 12:02 AM   #3
Mulder
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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.
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Old 03-29-2003, 04:56 AM   #4
joefocker20
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Silver

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Ok, old cars didnt have it, and If I had my ECU retuned with it ripped out, would it be a plus or negative?
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Old 03-29-2003, 07:25 PM   #5
Legacy777
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hmmmm.....I must be thinking of something else then....
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Old 03-30-2003, 01:53 PM   #6
HndaTch627
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joefocker-your car has no EGR system



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

jeremy
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