I wish it was as easy as a simple switch once you hit X PSI, but its not. Its a linear actuation via a diaphram. Basically as you approach higher boost levels, it opens the wastegate to allow exhaust gasses to bypass the turbine of the turbo.
The problem is when its not adjusted properly it can open earlier than its supposed to robbing the turbo of exhaust gasses at a much earlier stage in the process. Mine is so bad that with it connected, i have to really stomp on it to get it to about 18psi. Normal driving never passes 10 psi before 3k rpms. Disconnected, i hit that 18 psi almost mid throttle.
Mine is disconnected.
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