What do these emmissions results mean?

[91CavGT]

II know that through an emmissions sniffer test you can tell how a vehicle is running. I know HC readings tell you how effectively the fuel is being burned (err, how rich or lean the mixture is). NOx readings are an indication of ignition timing if I remember right. What about the other readings?



These are the results from my 1991 Cavalier station wagon. It has a built 3.1L V6 that's been bored 0.030" over, it's got a custom Crower camshaft, everything has been ported, polished, and port matched, it's got 320 cc RC Engineering injectors, a Haltech E6GMX standalone computer, and a Garrett 46 trim T3/T4 turbocharger. The motor currently has about 15,000 miles on the rebuild.


25 mph test

maximum allowed results

HC ppm 120 78
CO% 0.67 0.09
CO2% 13.9
O2% 0.8
NOx ppm 848 441
Dilution% >6 14.0


15 mph test

maximum allowed results

HC ppm 124 124 <-- running a bit rich and BARELY passed
CO% 0.69 0.13
CO2% 13.4
O2% 1.5
NOx ppm 937 554
Dilution% >6 13.5



So can someone explain these in a bit more detail?