Emissions ? NOX - Chevy Impala SS Forum
 
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post #1 of 8 (permalink) Old 11-07-2001, 01:04 PM
maxwellc
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I'm not sure if this is the right place to post this but here goes. I'm due up to renew my registration in March and i'll have to go through emissions first. They just recently added NOX to our emissions test. Can anyone tell me what it is, what are the common causes for high readings, and how to rectify it? I normally wouldn't be worried but i've been hearing from people with cars less than ten years old, which, in my opinion should have absolutely no probs passing emessions, not being able to pass the NOX portion. I'm worried because my car is slightly modified and I don't want to have to undo everything just to pass emissions. Any help is appreciated. TIA

Sean
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post #2 of 8 (permalink) Old 11-07-2001, 07:34 PM
DIMPALA
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NOX is caused by overheated combustion chambers,as long as your egr is working ok you will be fine,most people I think fail HC's .
post #3 of 8 (permalink) Old 11-08-2001, 08:00 AM
casava13
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Here is a link to a web page that I stumbled across recently:

http://www.castle-comply.com/Pages/articles/RSGDAN.html

It has a short write-up on NOx.
 
post #4 of 8 (permalink) Old 11-08-2001, 02:48 PM
maxwellc
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Thanks Dom, thanks Paul;

It seems like I might be okay. Just in looking at the article Paul sent, the mods I've done seem to go to some of the fixes for high NOx. The $.25 mod increases fuel pressure. If i'm not mistaken my old turbo Shadow ran rich so that the extra fuel would help to cool the turbo...possibly, it does the same for the combustion chamber? (let's hope) I run a slightly lower thermostat, engine runs slightly cooler? (let's hope) Opening up stock intake ducting and aftermarket intake manifold for cooler air charge and emissions testing in the dead of Wisconsin winter probably doesn't hurt either. Thanx again guys.

Sean
post #5 of 8 (permalink) Old 11-09-2001, 02:44 PM
green95ss
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(Cross-posted)

Just in case anyone was wondering how well the LT4 Hot cam held up under a dyno-emissions tests (like we have in NJ) here are my results:
GAS STANDARD RESULTS
NOX 786 306
HC 107 21
CO% 0.59 0.00
CO2% 7.1
O2% 10.2

So there you have it. I passed with flying colors and can run a 13.9 on street tires with a 4400 pound car that gets 16 MPG overall.
post #6 of 8 (permalink) Old 11-10-2001, 12:32 AM
limp impg
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mightycaprice,i live in kansasville just down the road from you. but if you are worried about it. you can go in early and have it tested for $10.00.if it hasn't gone up. i took my woman's ss (super slo) because swapped engines.and worried about emissions crap or you can register it up north if you know somebody.closes to us is walworth county. lake geneva,elkcorn,etc. [img]2.gif[/img]
post #7 of 8 (permalink) Old 11-13-2001, 11:23 AM
maxwellc
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limp; Thanks for the info, I kind of figured you could do that but was too lazy to find out. Nice to know there are some more b-body guys around here. Your not a Jones are you?
post #8 of 8 (permalink) Old 11-15-2001, 02:19 AM
limp impg
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mightycaprice, nope not a jones,just a grossman.jones might be the guy who owns an ss down the street. [img]0.gif[/img]
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