Why remove EGR????
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From: England
Why remove EGR???? Before anyone asks, yes I've searched. Found 250+ results and so far none of them have answered my question. 
1. Why remove EGR, what beneift is there? If any.
2. My understanding is that EGR is there to reduce NOx emmisions by reducing combustion temperatures, wouldn't this be a good thing and a good reason to keep EGR.
1. Why remove EGR, what beneift is there? If any.
2. My understanding is that EGR is there to reduce NOx emmisions by reducing combustion temperatures, wouldn't this be a good thing and a good reason to keep EGR.
I removed mine for modding, off road headers and ls6 intake. It along with the air system save alot or clutter around the intake a the rest or the engine compartment.
The corvette and the 01/02 fbody's dont use the egr so gm must not think it was to nessesary. There is no power gain for removing the egr either. One more thing when I swaped ls1 to ls6 intake there was alot of **** in the intake and in the intake runners of the heads, when I built my new motor the ls6 intake was clean and so were the heads. Hope this helps
The corvette and the 01/02 fbody's dont use the egr so gm must not think it was to nessesary. There is no power gain for removing the egr either. One more thing when I swaped ls1 to ls6 intake there was alot of **** in the intake and in the intake runners of the heads, when I built my new motor the ls6 intake was clean and so were the heads. Hope this helps
What he said.
BTW The egr valves function is to send Exhaust gases back through the
engine in order to burn more pollutants. I dont see how sending in hot exhaust gas back into your engine will reduce its temp.
BTW The egr valves function is to send Exhaust gases back through the
engine in order to burn more pollutants. I dont see how sending in hot exhaust gas back into your engine will reduce its temp.
On The Tree
Joined: Jun 2005
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From: Mullica Hill
dont forget.....the 2001-2002 F-bodies had a revised EGR, which was placed in a different spot. GM didnt just botch it all together like Conan said. Hes right about the other things, but GM did have it on 01-02 f bodies and therefor it does serve a purpose. Dont get rid of it....its there for a reason. Plus you have to have it deleted by a programmer.
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From: England
Originally Posted by 9T9BlueTA
What he said.
BTW The egr valves function is to send Exhaust gases back through the
engine in order to burn more pollutants. I dont see how sending in hot exhaust gas back into your engine will reduce its temp.
BTW The egr valves function is to send Exhaust gases back through the
engine in order to burn more pollutants. I dont see how sending in hot exhaust gas back into your engine will reduce its temp.
But reducing combustions temps I would have thought where a good thing esp with agressive tunes and/or FI. Detonation is an engine destroyer.
300BHP/ton:But reducing combustions temps I would have thought where a good thing esp with agressive tunes and/or FI. Detonation is an engine destroyer.
Hmmm... That just might be the reason why I have never recorded any KR with my car through its various stages and with trying different timing settings all the way to 29.5 degrees as I have kept all my emissions intact including the EGR by using the SLP LS6 intake with the EGR provision. I don't know, but maybe that's it.
Hmmm... That just might be the reason why I have never recorded any KR with my car through its various stages and with trying different timing settings all the way to 29.5 degrees as I have kept all my emissions intact including the EGR by using the SLP LS6 intake with the EGR provision. I don't know, but maybe that's it.
Originally Posted by HAWK#549
dont forget.....the 2001-2002 F-bodies had a revised EGR, which was placed in a different spot. GM didnt just botch it all together like Conan said. Hes right about the other things, but GM did have it on 01-02 f bodies and therefor it does serve a purpose. Dont get rid of it....its there for a reason. Plus you have to have it deleted by a programmer.
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From: Blairsville, GA
Originally Posted by HAWK#549
dont forget.....the 2001-2002 F-bodies had a revised EGR, which was placed in a different spot. GM didnt just botch it all together like Conan said. Hes right about the other things, but GM did have it on 01-02 f bodies and therefor it does serve a purpose. Dont get rid of it....its there for a reason. Plus you have to have it deleted by a programmer.
Now if they could pass emissions without cats... that would ROCK!!!
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Originally Posted by 1999Daytona500PaceCar
Hmmm... That just might be the reason why I have never recorded any KR with my car through its various stages and with trying different timing settings all the way to 29.5 degrees as I have kept all my emissions intact including the EGR by using the SLP LS6 intake with the EGR provision. I don't know, but maybe that's it.
Originally Posted by HAWK#549
dont forget.....the 2001-2002 F-bodies had a revised EGR, which was placed in a different spot. GM didnt just botch it all together like Conan said. Hes right about the other things, but GM did have it on 01-02 f bodies and therefor it does serve a purpose. Dont get rid of it....its there for a reason. Plus you have to have it deleted by a programmer.
The 01/02 still has the air system, but from what I have read there is no egr. 
. 
On The Tree
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From: North Carolina
First off, NOx is formed when combustion temperatures reach 2500°.
600°+ exhaust temperatures are relatively cool by comparison. Also, because the exhaust gas is inert, its non combustible, so it displaces available room for the air/fuel mixture. The less air/fuel mixture that can be burned, the less heat produced. Of course, if we are burning less air/fuel mixture, we make less power, so spark timing is usually advanced a little and EGR is disabled at WOT. Because its disabled at WOT, removing the valve will NOT help with track times.
The EGR valve was NOT designed to "reburn" pollutants.
Another benefit of the EGR valve is that it reduces pumping losses, which helps with fuel economy.
Also, I'd love to see where this "mystery" EGR valve is on 2001 & 2002.
600°+ exhaust temperatures are relatively cool by comparison. Also, because the exhaust gas is inert, its non combustible, so it displaces available room for the air/fuel mixture. The less air/fuel mixture that can be burned, the less heat produced. Of course, if we are burning less air/fuel mixture, we make less power, so spark timing is usually advanced a little and EGR is disabled at WOT. Because its disabled at WOT, removing the valve will NOT help with track times.
The EGR valve was NOT designed to "reburn" pollutants.
Another benefit of the EGR valve is that it reduces pumping losses, which helps with fuel economy.
Also, I'd love to see where this "mystery" EGR valve is on 2001 & 2002.
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From: England
Looks like there's some good info here. However the question still has not been answered.
'Why remove EGR??????'
If it has no/next to no effect on output. So far the best reason for removing it, is it cleans up the engine bay. Well I normally drive with the bonnet shut so it sounds of little benefit.
'Why remove EGR??????'
If it has no/next to no effect on output. So far the best reason for removing it, is it cleans up the engine bay. Well I normally drive with the bonnet shut so it sounds of little benefit.
Originally Posted by 300bhp/ton
Looks like there's some good info here. However the question still has not been answered.
'Why remove EGR??????'
If it has no/next to no effect on output. So far the best reason for removing it, is it cleans up the engine bay. Well I normally drive with the bonnet shut so it sounds of little benefit.
'Why remove EGR??????'
If it has no/next to no effect on output. So far the best reason for removing it, is it cleans up the engine bay. Well I normally drive with the bonnet shut so it sounds of little benefit.
Thread Starter
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From: England
Originally Posted by Redneck Z
I would also like to know where the mystery EGR valve is on the 01-02's.
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From: England
Originally Posted by conan
You basicly answered your question, it cleans up the engine bay, adding a ls6 intake or off road LT's. I personaly think blowing exhaust gas back in to the engine that likes cool fresh air is not helping any thing, some might disagree.
A turbo or blower can make an engine look cluttered but you wouldn't remove it for that reason alone.
Also LT's and even the LS6 manifold are availble with all the EGR provisions.
I also understand the logic your using
hot air = low power
But the physics behind it don't add up.
Maybe someone will come up with a better answer yet. Think I might sit on the fence with this one at the mo.
If you ain't got EGR - don't worry
If you have - leave it be