As title and does anyone know what Aculator pressure should be on a v3 sti please?

Thanks

 

You have boost control settings on the commander that can be adjusted assuming they have not been locked, alternatively you can run a pipe direct from the actuator to the compressor housing eliminating the boost control solenoid will mean the wastegate opens around 7 psi .

You would still need to have the mapped checked assuming you have made changes to the set up.