difference between headers with egr and without
Thread Starter
Racer
Joined: Nov 2008
Posts: 252
Likes: 0
From: Morehead KY
difference between headers with egr and without
Is it better to get headers with egr or not? I dont really have no idea on what it is? Not very experienced with this, never have installed headers on any vehicle before, have an 89 vette, which is pretty much stock, but soon will have a zz4 in it and wanted to know if i need headers with or without egr?
Race Director
Joined: Nov 2003
Posts: 12,221
Likes: 446
From: Overland Park Kansas
2020 Corvette of the Year Finalist (appearance mods)
C4 of Year Winner (appearance mods) 2019
Are you set on re-installing the stock intake?
Do you have emission's testing in your area? Do you care (strongly) about it?
Do you have emission's testing in your area? Do you care (strongly) about it?
Team Owner
Joined: Dec 1999
Posts: 34,873
Likes: 487
From: Lacey WA RVN 68-69
NCM Sinkhole Donor
If you get headers without an EGR hookup, you are going to have to "
fool" the ECM into thinking the EGR valve/switch is working. Without the switch in place, you will get a EGR code and the SES light will stay on. If you remove the EGR valve from the intake manifold, you will have to get a block-off plate.
The Hedman Elite #68487 has hookups for both AIR and EGR. If you have to have an emissions inspection, get those.
In any event, a ZZ4 crate motor may not pass any required emissions testing if there is no AIR or EGR installed, headers or not.
You should definitely check your state's emission laws before going too far with mods and find out later on that the car can't be licensed if it won't pass any testing (sniffer or visual).
fool" the ECM into thinking the EGR valve/switch is working. Without the switch in place, you will get a EGR code and the SES light will stay on. If you remove the EGR valve from the intake manifold, you will have to get a block-off plate.
The Hedman Elite #68487 has hookups for both AIR and EGR. If you have to have an emissions inspection, get those.
In any event, a ZZ4 crate motor may not pass any required emissions testing if there is no AIR or EGR installed, headers or not.
You should definitely check your state's emission laws before going too far with mods and find out later on that the car can't be licensed if it won't pass any testing (sniffer or visual).
Race Director
Joined: Apr 2003
Posts: 17,700
Likes: 1,667
From: moraga ca
Correct me if I'm wrong. I thought the egr valve and system is built into the intake manifold. Exhaust gasses are allowed to pass throught the egr valve and dilute the intake mixture going to the combustion chamber. This is all done within the the intake. I think you are referring to the air pump which injects air into the exhaust manifolds or headers under certain circumstances. They are both different and separate systems.
Team Owner
Joined: Feb 2006
Posts: 24,460
Likes: 7
From: sw Ohio
Correct me if I'm wrong. I thought the egr valve and system is built into the intake manifold. Exhaust gasses are allowed to pass throught the egr valve and dilute the intake mixture going to the combustion chamber. This is all done within the the intake. I think you are referring to the air pump which injects air into the exhaust manifolds or headers under certain circumstances. They are both different and separate systems.
