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SignUp Now!It sounds like you have a q-boost, it's the same one I ran on the 86 gn.I'm not sure what brand the controller is. It has another knob inside the car for fine tuning too.
with a normal wastegate, it start to open before hitting max boost. During the spoolup phase, you'll be venting exhaust pressure before hitting your target boost. With the brass MBC, it holds off pressure going to the wastegate until the last second, then lets it open rapidly.
That being said.... faster spoolup isn't always a faster car. If the rapid spoolup causes you to blow the tires off all the time. Than again, I do love me a good 2nd gear burnout