Originally Posted by
lafrad
Baro Learn is used to update the ECU barometric pressure *during the current key cycle*. The ECU uses the MAP sensor in the manifold (the thing that reads your boost) to update its Baro as you drive... any time you get a throttle position that is near what it expects WOT to be, it will update its baro reading based on some maths... (air filter pressure drop, etc etc etc).
With a supercharger out there, it has no way to know that the pressure its seeing in from the sensor is the real BARO or if its boost.... It will go and update the baro to a bad value!
It's not *perfectly* ideal, but you are going to have to disable BARO learn, and let the short term adaptives work out the fueling changes based on elevation changes as you drive. the baro update from 82 to 70 (or the other way, from 70 to 80 to even sea level of 100kpa) shouldn't really cause any trouble for you, even if its not perfectly "up to date". those are still relatively small changes in overall air present. Just get the VE table dialed in and run with it... the car will just set its BARO on key "on" like it always does. This has been this way on these hemi's since we started tuning them years ago.