To EGR or not
Thread Starter
Teching In
Joined: Jan 2005
Posts: 20
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From: Thousand Oaks, CA.
To EGR or not When eliminating emissions related items from PCM programming and harness, are there any things you would want to keep even though they are mainly smog related? For example, I am using manifolds instead of headers. I have the EGR hooked up. If I don't use it, how will that affect engine performance, and fuel economy? Being smog exempt, is there any reason I would want it to function? The same question applies to other things such as cannister purge and post cat o2.
THERORETICLY you get better gas miliage when EGR is on..since you're deluting the air, and it gives it less fuel.... but realisticly, you will never see any diff, even over 1000s of miles. just because it looks nicer, id take it off and use block off plates.
canister purge, you may want to keep.... if you have the rest of the fuel system... its nice to have a totally sealed fuel system. no fuel smell. no lost money on evaporated fuel. but if the system isnt sealed, then its worthless anyway.
the sole reason the post cat O2s are there, are to ensure the cats are working properly. if you're planning on running cats, you can leave them there to know that they're working... but if you're not running cats (somthing that would give more MPG diff then the EGR ever will) then you can delete them, as they're useless and would jsut throw a cat code anyway.
canister purge, you may want to keep.... if you have the rest of the fuel system... its nice to have a totally sealed fuel system. no fuel smell. no lost money on evaporated fuel. but if the system isnt sealed, then its worthless anyway.
the sole reason the post cat O2s are there, are to ensure the cats are working properly. if you're planning on running cats, you can leave them there to know that they're working... but if you're not running cats (somthing that would give more MPG diff then the EGR ever will) then you can delete them, as they're useless and would jsut throw a cat code anyway.
I would remove the egr and cats if you are exempt. In addition to better looks with no egr the engine will be cleaner, over time the egr will soot up the manifold ect. Also, you'll need access to tuning software to dislable the egr/cat codes, vats ect.
Thread Starter
Teching In
Joined: Jan 2005
Posts: 20
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From: Thousand Oaks, CA.
The only thing I am wondering about eliminating EGR, is that, doesn't the EGR cool the combustion chamber? I know, for example, that an inop EGR leads to increased NOX emissions due to hotter burn. I am also wondering if the hotter temp will make you run premium fuel to avoid knock. I am in So. Cal, so the gas issue is kind of touchy. They make us squeal like pigs here every summer.
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Joined: Feb 2004
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Originally Posted by lmarino
The only thing I am wondering about eliminating EGR, is that, doesn't the EGR cool the combustion chamber? I know, for example, that an inop EGR leads to increased NOX emissions due to hotter burn. I am also wondering if the hotter temp will make you run premium fuel to avoid knock. I am in So. Cal, so the gas issue is kind of touchy. They make us squeal like pigs here every summer.
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