Thanks gtsboy,
So what I have got to answer is why its changing to the knock maps, and it seems by your answer the only thing that will do it is the knock sensors. I was hoping that it may have been the TP load limit not coping with the extra boost.
If the sensors do flip it over to the knock maps, shouldn't this register as a #34 fault code? I've checked after a run and I just get the same 55 all clear?
It was only when I changed the knock timing to 5 deg and recorded a run in tuner mode that it became obvious it was swapping maps, yet in stream mode nistune would never light up the knock maps to indicate which map it was reading, it would only ever have the main maps shaded green. I'll have to get on to Matt about that.
Cheers Mike.