If it won't rev past 4 its in limp mode.
The actuator is working fine.
0.5 bar is actuator open which you see under ecu control.
1.1bar is actuator closed when you disconnect the vacum/boost hose.
The actuator is just a mechanical device that opens and closes based on the pressure seen on its diaphragm.
Your foot/the turbo control how much pressure is seen by the actuator. The bcs then bleeds air away from the actuator under ecu control to allow you to achieve higher then actator cracking pressure boost levels.
The majority of modern turbo cars apply this principle so that if a fault is detected the ecu can limit the boost levels.
You found the wrong restrictor in the bcs pipes which limited boost. The right one gave you the right boost. Dropping to 0.5 is a sign the ecu has detected a fault. If it were MAP sensor related the ecu would of logged code 45 iirc. As there is no CEL this is a good indication its MAF as I have never known this fault condition to give a CEL.
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