Ken,
The HC level is a refl
Ken,
The HC level is a reflection of the engine's ability for complete combustion...so, the HC level is very important. The lower the HC number, the higher the combustion efficiency is.
So...without cats, you should be able to achieve 180ppm HC, with 1-1.3% CO. Theses are the numbers that I have been able to obtain on numerous non-smog Ferraris, with not too much difficulty.
If I am understanding you correctly, the only way you can achieve low HC is with a CO of 3.5%. If this is true, there are still some problems with the CIS system that need to be addressed.
The CIS system does not know the difference between a 90 degree hot start and a 50 degree hot start...as the hot control pressure are the same.
Sorry, but I am not familiar with the (additional) cold start air valve.
Regards,
David
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