The only thing that changed was the ecu replacing the AFPR arrangement. But you're right, HC is a loose mirror of NOx and CO2 loosely follows the NOx trend when speaking AFR. I suppose there are missing variables from 5 years ago not included above... like ign timing which was most likely changed with the ECU.

Last datalog shows lightest load zones around test rpm to be leaner than stoich. So adding more fuel to my current 07 results would have increased CO2 and NOx, while reducing the HC.

 

Aha! I was looking for that (similar) graph!

Anywho, glad you passed October might not be so fun for me

 

the standards aren't very high here (though higher than no standards ) - remember all my NA driving was only autotuned. I didn't even check a datalog first- just looked at the NB meter which was similar to last time and went for it.

 

This time I actually tried, well sort of. I got my AFR gauge (LC1 analog signal) out of the lean leds and into the stoich for the load zones being tested. Basically just pumped up the fuel a couple of points. This with the new high flow cat, everything else the same. And I got it done early this year by a full week ahead of the deadline.


thanks to Ben for getting me one of his personal spare manual TPSs, though it turned out that the max idle for my car was 1500!

 

Congrats Rob!
Now wish me luck--I hit the rollers this Saturday :(

 

good luck - it has been my experience that we all run our cars lean for fuel economy (in the DD zones) and that's what inevitably leads to fail. The GA emissions definitely seem to be more lenient on older cars that run rich. I should've logged my test.