EGR and Corvettes?
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Registered User
Joined: Feb 2002
Posts: 3
From: Calgary, AB ,Canada
EGR and Corvettes?
Just wondering about something. I am considering burning my own chips with all the great info out there.
In the meantime, I am replacing my intake with an Edelbrock in my F-body. I am planning on removing the EGR using a plate.
Now I've read all the articles on the function of it and why you should keep it enabled, lowered combustion chamber temps, less detonation, blah, blah, blah!
So I am wondering if out of all the knowledgeable people out there...tell me why to this day TPI/LT1 & LS1 Corvettes never have used an EGR valve?!
I've read that they have always had a slightly different cam with enough overlap to compensate for the lack of EGR.
So...tell me, if I am changing to a much more aggressive than stock cam, with way more overlap than stock, why keep the EGR?
If a stock 'Vette doesn't need it why should Camaros and Firebirds?
In the meantime, I am replacing my intake with an Edelbrock in my F-body. I am planning on removing the EGR using a plate.
Now I've read all the articles on the function of it and why you should keep it enabled, lowered combustion chamber temps, less detonation, blah, blah, blah!
So I am wondering if out of all the knowledgeable people out there...tell me why to this day TPI/LT1 & LS1 Corvettes never have used an EGR valve?!
I've read that they have always had a slightly different cam with enough overlap to compensate for the lack of EGR.
So...tell me, if I am changing to a much more aggressive than stock cam, with way more overlap than stock, why keep the EGR?
If a stock 'Vette doesn't need it why should Camaros and Firebirds?
Registered User
Joined: Dec 1969
Posts: 1,147
From: Phila., PA
All TPI Vette motors have them. They're just plumbed into the intake via an external pipe instead of through via the exhaust crossover.
LT-1 Vette motor also has an EGR, I beleive, and it's plumbed in externally to the rear of the intake just like on an F-body motor.
LS-1 I don't know.
There's nothing special about Vette motors and EGR. Or any motor and EGR. It's PURELY an emissions control device designed to reduce NOx emissions.
The ECM adjusts other parameters at the same time it activates the EGR valve (injector pulsewidth and spark advance). THat's already in the stock programing. So if you deactivate the EGR via a chip re-burn it should run just fine with no further tweaks requried of the fuel/spark maps.
LT-1 Vette motor also has an EGR, I beleive, and it's plumbed in externally to the rear of the intake just like on an F-body motor.
LS-1 I don't know.
There's nothing special about Vette motors and EGR. Or any motor and EGR. It's PURELY an emissions control device designed to reduce NOx emissions.
The ECM adjusts other parameters at the same time it activates the EGR valve (injector pulsewidth and spark advance). THat's already in the stock programing. So if you deactivate the EGR via a chip re-burn it should run just fine with no further tweaks requried of the fuel/spark maps.
Thread Starter
Registered User
Joined: Feb 2002
Posts: 3
From: Calgary, AB ,Canada
Geez, that was dumb. My memory must be fading with age.
According to AC Delco.com, it is only the LS1 'Vettes that don't have EGR.
Not sure why I thought they all did
I suppose that still leads me to wonder how they can get away with no EGR by having a cam with slightly more overlap than the f-body ones. Why not do this to more engines? I read this in a GM High Tech issue, I think.
Again, my memory fades me....
According to AC Delco.com, it is only the LS1 'Vettes that don't have EGR.
Not sure why I thought they all did
I suppose that still leads me to wonder how they can get away with no EGR by having a cam with slightly more overlap than the f-body ones. Why not do this to more engines? I read this in a GM High Tech issue, I think.
Again, my memory fades me....
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