Okay I know there is no documented proof for this..... so all I can do is go by what I feel and see on this. There was that other thread about how rumors get started and it said that the 92's had a problem meeting emssions in power mode. It said the car had an extra 37 hp when it kicked in. I really did not think much about this until reading that thread. This is what I think and it isn't just me as my son has said the same thing.
"Sometimes that car seems to be a lot faster."
So these are my thoughts on when the 37hp
kicks in.
60 to 80 degree ambient, transmission warmed up but not hot, engine warmed up but not hot (cooling fans not on) and stomping on the accelerator in the 30 to 45 mph range.
But once again, no proof and its still only a rumor until then.