You are correct in that the MicroTech ECU has a hard and soft rev limiting feature….I will get back into the manual and see what I can learn.   

My understanding of rev limits is that a hard limit will shut you down completely, at least until the condition is cleared, and you'd certainly notice that :-)  Soft limits are supposed to reduce power as needed to keep you where the limit is set.  I've read that some of these are pretty smooth, and you won't necessarily even know it's happening.  One technique is to remove ignition pulses in an intelligent manner.  For example, perhaps it will remove every 4th ignition pulse if you start to approach the limit, then if you continue to advance the throttle, maybe it has to take out every 3rd, then maybe every other pulse. This might even explain your engine behavior on the first flight.  Some systems can do this with fuel as well, but I think it's more common to do ignition.  Again, I'm not familiar with the MicroTech, so this is just a guess based on reading about other ECUs.

Good luck,

Rusty

Thanks, Rusty…I’m heading out there now to play with it some more and just maybe stumble upon something useful. Paul Conner