Do you know the spring pressure of the new actuator you have fitted? Typically I believe the standard STI has a 0.8bar spring in the standard actuator.

If your new actuator is uprated and stronger than this (which I suspect it is) then it will probably need to be mapped in.

You can get a simple logger plugged into the ODB2 port on your car and run something like Torque Pro or BTSSM on an android device through a KKL cable with USB OTG adaptor to log the ECU boost pressure.

 

are they not fixed based on the internal spring pressure, with only the preload adjustable on them?

just use TorqueApp to measure/log your boost profile before fitting the new turbosmart then fit it and log again and adjust where necessary

 

I agree Gambit, when you fit them you only adjust for the pre-load so they are only just closing when static.

 

 

That sounds like a standard spring then. Should be fine if you are able to set the boost pressure correctly on the actuator then. Connect up a boost gauge or monitor the ODB2 port boost pressure and set the actuator so that you are getting the same peak boost. Should be fine.