RE: [DML] Emissions Tuning

["Darkstar" <darkstarmedia@xxxxxxxxxxx>]

 If I remember correctly CO is partially burnt fuel, HC is unburnt fuel.  I
think what you are seeing is a bad cat. the possibility of a rich condition
is unlikely due to the high NOx.  you are close in every number so simply
running the car at 3500 RPM for about a minute to heat the cat may work. if
you have a non contact pyrometer you can measure cat function. the area at
the upstream part of the cat should be about 100 degrees cooler then the
output side due to the chemical reaction. It's been a while since I have
done smog tech stuff so I am a bit rusty. Anyone, feel free to correct me if
I am wrong.

Darkstar

-----Original Message-----
From: dmcnews@xxxxxxxxxxxxxxx [mailto:dmcnews@xxxxxxxxxxxxxxx]On Behalf
Of Michael Townsley
Sent: Tuesday, May 03, 2005 5:50 PM
To: dmcnews@xxxxxxxxxxxxxxx
Subject: [DML] Emissions Tuning

> my car has failed the new state auto emissions testing protocol in CT.
> 
> The results were as follows:
> 
>               HC(PPM)                CO (%)         NOx (PPM)
> 
> 
> 
> Allowed       172                    0.55               1207
> 
> 
> 
> Emissions     205                    1.52               1548
> 
> Contributing factors could be that I have twin turbos with out cats > and I have an exhaust manifold leak. I recall some previous
> discussion on the DML about adjusting the car to pass emissions
> testing without a cat (and if fact my car did pass 3 years ago).
> Can anyone tell me what tuning proceedure I should use to get the
> lowest possible emissions. Thank you.
> 
> Sincerely,
> 
> Mike Townsley




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