Even more interesting about the AZ Dept. of Environmental Quality site is that you can print the trace of the actual graphs from the dyno/roller test. Just my layman's eye on the CO graph tells me something is jumping the mixture around. While the speed runs roughly the same during the first half of the test, then ramps up to a higher speed for the last half, the CO readings are up/down all the way across. The same goes for the NOX graph, huge spikes, huge valleys.

I'll scan these and post them, it's mildly interesting and I've not seen it done on here before. The graphs are not overlaid, but it still gives you an idea of how they relate.

John B.