Is the test at idle or on a dyno?
This is a test on a dyno. It runs through the gears twice and on the second pass sits at 60mph for a minute or so in 5th. They gave me a diagnostic printout showing NOx relative to speed through the test. The spikes are occurring at the final third of each gear change. They don't show an RPM but I could hear them driving and I would guess it was between 2.5 and 3.5k. During the 5th gear run at the end there is a fair amount of NOx as well, over the limit. So it would seem to be RPM related, not just during acceleration.