Quote: Originally Posted by
dewfuel 
so i always need to substract 14 psi from the pid? like : if avg map to use is 34 , 34-14=20 ?
NO, you need to substract YOUR Baro psi,,what ever it is. It can change from day to day, so be sure to log it.
Alternatively, to lowest TIP pressure is equal to the Baro pressure.