I am running a eBay external wg with a t3/t4 turbo and my wg is supposed to have an 8psi spring and it shoots to 20psi I’m not sure on what size the wg is also my mbc seems to work I adjust it and blow into it and it works but does not control my boost at all . I have tried both ports and got no results . I even tried to run off spring pressure and still it over boosted
btw I have boost cut on at 10psi

 

How do you suppose your set-up is reaching 20 psi, when boost cut is set to 10 psi?
What gauges are you relying on?
What does your MAP say atmospheric pressure is (kPa) with key on, engine not running?

What engine?
What car?
What ECU?
Was it once operating correctly?
Can you post pics of your set-up?

DNM

EDIT: Post a Meet and Greet and tell us about your car, your plans for it; post some pics, etc.