Magnacharged Z06 smoking on the dyno

Looks almost like it was dumping in gas to try to correct for running lean? Then it finally gave out? I'm not sure...just random puffs of black smoke out the back makes me wonder if it was trying to compensate for running lean
 
It just looked like one of those "see how much power you have" portable dynos...thought maybe the ecu itself was doing it, but again I'm not sure how that works.
 
I've seen that happen before when hitting the rev limiter when running rich.

But the white smoke looked like coolant making an exit.
 
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