How many turns of the wastegate?

[silverzx]

I thought mbc work to limit the boost? You set it high then the mbc controls it lower

Case 1
If actuator is set to 30 PSI then it will only open at 30 PSI.
If boost controller is set to 20 PSI then it will open and let air to the actuator at 20 PSI.
However because the actuator is set to 30 PSI it won't open and will just keep boosting until 30 PSI is hit.
Therefore your boost controller is doing nothing.

Case 2
Actuator is set to 14 PSI.
Boost controller is set to 22 PSI.
Driving down the road boost goes up to 22 PSI, boost controller opens and lets the air to the actuator which will then open as its hitting over its 14 PSI pre-set.