!EGR and Measured NOx

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Jul 19, 2008 | 08:43 AM

dwhiteZ28

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From: Colorado Springs, CO

!EGR and Measured NOx

I'm considering upgrading to the LS6 intake before my LT install and was wondering if anyone has passed state emissions tests for NOx without the EGR installed. Could a proper tune take care of the SES light as well as pass for measured NOx?

Thanks..

Last edited by dwhiteZ28; Jul 19, 2008 at 09:19 AM.

Jul 19, 2008 | 11:05 AM

Frost

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most NOx reduction comes from your cats, though not all of it.

Jul 19, 2008 | 12:25 PM

06 SS

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stay away from aftermarket cat-con, stick with stock and you should be good to go.

Jul 19, 2008 | 03:12 PM

jimmyblue

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NOx comes from lean and high pressure in the cylinder (so you
have nothing better to do than burn nitrogen).

You probably want to zero out the EGR advance and make the
main spark table look like a non-EGR car. Excess advance adds
to peak cylinder pressure / heat in the hole.

Jul 20, 2008 | 02:37 PM

sreve

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wasn't it the cam swap in the '01 & '02 with increased over lap that made the egr unnessasary?

Jul 20, 2008 | 04:00 PM

TAQuickness

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The 01-02 cam was part of it, the tune is the other part.

Jul 20, 2008 | 04:10 PM

sreve

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Quote:

Originally Posted by dwhiteZ28

so colorado still does a sniffer test? do they do a visual on the emission components?
i think you see where i am going with this.

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Jul 31, 2008 | 07:02 AM

dwhiteZ28

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From: Colorado Springs, CO

Quote:

Originally Posted by sreve

so colorado still does a sniffer test? do they do a visual on the emission components?
i think you see where i am going with this.

The county I live in (El Paso) has suspended emissions testing..for now. But previously they did a visual and sniffer test. But all of my vehicles were well below the threshold for NOx and HC which makes me wonder if the Camaro would be passable without EGR. The visual was for CATS with a quick look under the hood. The emissions sticker would be a tip-off that EGR should be there.