In calibrator, is the default MAP table strictly a backup table in the event the MAP sensor fails or is this table also responsible for shaping some torque management?
It's supposed to give the ECM some "get you home" standard in case of map failure, but you never know with the engineers...
You should be able to verify what the effect is by doing a quick recording session with the MAP sensor unplugged (maybe using the C3 software?), comparing the readings to the table, or editing the default table and watching what happens to the MAP reading next session.