Originally posted by warmonger:
Honestly, I need a lower pressure spring in my wastegate and then use an external boost controller.


Now you are thinking with simplicity.

It is much easier to create an rpm or signal driven "vacuum leak" to raise the boost pressure.

Matter of fact Mitsubishi had a solenoid setup in the Conquest. That had a 3 way vacuum solenoid that limited boost in first gear. (i.e. whenever it was energized)
I just happen to have that solenoid in my electronics cabinet. I forget off hand but it was about a 3-5psi cut in boost from the factory 10psi. It was accomplished by offset pressure through the 3 ports.

I removed it when I went to a 2 port opposed vacuum diaphramed wastegate actuator. (internal wastegated turbo)

2000 SVT #674 13.47 @ 102 - All Motor! It was not broke; Yet I fixed it anyway.