When you log SAE.MAP you have both .psi and .kPa available... (i.e. both units are available for that pid... i.e. both units for 1 pid).
Here's a calc_pids.txt I found on the forum...
This is technically more correct since BARO may not always be 14.5psi (100kPa).
Take note: you can use SAE.MAP or GM.MAP, and SAE.BARO or GM.BARO.
cool....this has been very educational. Where does the baro reading come from? I would first think the map but if the engine is running and the map is reading vacuum or boost it wouldn't be able to read atmospheric correct? I'm going to try these back to back this week and see what the difference in readings are. I've just been using 14.5038 because that's 1 bar.
At key-on engine-off, the PCM reads the MAP sensor and saves the value as BARO...
Then when the engine is running, for N/A engine, the PCM takes note of the MAP sensor value at WOT and adjusts the value of BARO accordingly (after performing sanity checks)... for boosted engine, PCM can't do this.