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Old 11-02-2003, 03:10 AM   #1
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Default EGR Block off idea

Today at our meet, we saw a 500 HP (crank) GP. It had a M112 blower, custom intercooler, etc. But the guys who are piecing it together, showed us the best way (they think) to block off an EGR. They block it off on the exhaust inlet side, and so there'* no vacuum, they open up the pipe, so it gets cold air sucked in. They added a small filter, kinda like a oil cap breather. Think this would help guys? Jeffrey10x4, wren?
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Old 11-02-2003, 03:17 AM   #2
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Thats the same setup as ZZP sells.

I ended up removing the EGR setup blocked off at exhaust manifolds with a ZZP blockoff plate and opened the hole up on another blockoff plate and bolted it to the lower intake manifold. You also need to remove the codes from the PCM doing it this way.

So in short- removing the entire setup is the best way-but if you have smog testing it is pretty much irreversable. The way your describing is the best way if you smog testing around you.

Hope that helps-Jeremiah
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Old 11-02-2003, 11:42 AM   #3
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Yes that is the ZZP EGR blockoff setup, and it works very well. I would recommend it to anyone considering it.
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Old 11-02-2003, 12:10 PM   #4
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Now I keep hearing about the '92 bonne'* that keep burning exhaust valves do to haveing no EGR system. How does that relate to doing something such as this?
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Old 11-02-2003, 12:31 PM   #5
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This is my problem with it as well. I know the gas you're recirculating is oxygen defficient, and therefore doesn't burn, it justh helps fill in the combustion chamber. But will adding cold, combustible air cause it to burn?
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Old 11-02-2003, 11:40 PM   #6
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Yeah me and Jason were discussing this a lot in his dorm last night because for the longest time people have preached on how important the EGR is in protecting exhaust valves. Well the guys with the 500hp GTP told us that we should detatch the EGR tube from the exhaust manifold and block that hole in the manifold followed by putting a small oil cap filter in the EGR tube. This way the intake will be sucking clean air instead of hot exhaust gases. Ok, now my understanding is that the EGR sends unburnt gases to the intake at WOT for them to be burned as well as fill in the "extra" space in the cylinder to decrease temperature. So if you block off the manifold and allow clean/cooler air into the intake, don't you greatly increase the temps of the engine overall?

We need this explained to us please! I thought EGR = safe happy smiling engine.
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Old 11-03-2003, 01:18 AM   #7
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Quote:
We need this explained to us please! I thought EGR = safe happy smiling engine.
I thought so too.
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Old 11-03-2003, 01:28 AM   #8
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Not a bad idea, but you may need a custom burn on the PCM to make up for the lack of EGR, or you'll be setting codes and SES.
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Old 11-03-2003, 01:32 AM   #9
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Well if we use the block off, but cut it open (so it doesn't create a vacuum) air still flows in, etc. Does the PCM detect the EGR temp? or only if the valve isn't working. Cause if it'* activated it will still pull air, and the EGR valve wouldn't really know the difference.

EDIT: How did Jeffrey10x4 do his?
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Old 11-03-2003, 02:15 PM   #10
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I dont understand how NOT pulling crappy exhaust back in through the intake can burn a valve.
I haven't had any problems with my COMPLETE EGR delete. And yes you must delete all codes from the PCM for the EGR system for a complete removal. To just run the blockoff plate-you dont need to touch the PCM
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