cheers for the link but i found that on google earlier, and it supports what I said.
keeping throttle position constant while increasing RPM should cause a fall in MP because the pistons are trying to suck more air through the engine (i believe the linked article has the opposite example, fixed throttle, lower RPM, MP goes up).
Are there any situations where this wouldn't be the case? surely car engines can't differ from aircraft engines in that respect (since they both work the same, although the RPM/torque range my vary). So far everything supports what i thought, but not the data i saw.
If no one else has any ideas then i'll just ignore the data and accept what i thought, but more ideas are welcome