Dave, go into the limits menu. When you get to the auto tune screen hit change value and scroll till you see Idle and ramp set. Select manual to save the change. You can confirm by hitting the info key and you will see the current barometric pressure. The pressure sensor is so sensitive that you can have the plane on a table and put it on the floor and you will see the pressure reading change. The limits menu will give you a PF number when auto tune is enabled. The is the percentage of max performance available based on the current air temp and barometric pressure. I don't baby my any of my 140 RX motors, there based on the design of the P-160 so there already de-rated.

Regards,
Don