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One of the axis of the timing maps is load. Load whether measured by manifold pressure or calculated from the mass of air measured and rpm equates to the same thing. Mass air measurements are more accurate actually. There do seem to be some mechanical limitations to running higher boost. Whether just because of 150,000 miles of wear or because the ring set up isn't optimal for forced induction or a combination of both there is obviously a problem with blow by.
We can probably improve the tuning at higher loads as well. My personal feeling is that these 150,000 mile factory engines obviously aren't happy with a lot of boost so we aught to go ahead and build the engines appropriately for what we want...which we are doing...and to do our higher load tuning on these engines. It seems kind of pointless to try and run high boost on worn out motors. It will be easier for me to tune the high loads when I don't have exhaust flow problems and fluttering rings confounding my measurements anyway.
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