Closed loop vs. open loop mode

[GSTurbo1]

I'm a little confused on the difference between the two. Which is better to run the higher percent of the time?

 

[96TurboGS]

I'm assuming your talking about MS?

Closed loop is best to run during part throttle through 100kpa; Turn off when in decel and in boost. Closed loop changes the speed density calcs to obtain the correct AFR. Open loop is without correction from "a" sensor.

 

[GSTurbo1]

Makes perfect since