How do I baseline the wastegate?

[SpeednV6]

I've been playing around with the boost. I've noticed when I run with the open dump, I get 20psi regardless of wether or not I adjust 2-3 full turns on the rod. I tested my baseline by disconnecting the wastegate harness and stepping on the gas. I got 9 psi. I shortened the rod again 2 full turns, and this time I got 12 psi. I of course recieved trouble codes and pluged back the harness. When I stepped on the gas, this time, I really felt torque on the bottom end. I did get 20 psi again.

My q: Is this the proper way to check baseline wastegate?
Is 12psi acceptable or is there room for more psi?
What is the proper psi for base?

Thx

 

[Intercooler]

Hope you have a scan tool! When you say base I am lost. You set boost according to what you can run with the octane you have safely. If it is street you may be able to run 17 PSI with pump gas where at the track 20+ is possible with race fuel. Start low and work your way up.