Unable to control the boost

[David15151]

Basically, I have a new turbine housing on my 16g and it seems that everything I try to do there is no way to control boost. I have a Joe P MBC and ive hooked it up every which way and set it up and down. Everything worked fine before. Basically I do a pull and the boost just keeps climbing until i let of the gas (usually by the time it hits 18psi). I have even tried taking the controller totally off to try to let the wastegate open itself.. no luck. Is the flapper not opening at all? I know its closed cause im hitting 15psi by 3500. Any ideas what it could be and how to fix it?

 

[DSM90AWD]

Is the wastegate the orig one from your 16G? If not it's possible you have a 17psi Garrett actuator which would explain why you cannot set boost < 17-18psi.

If is the stock Mitsu actuator (or want to test an unknown actuator), attach a bicycle pump (the french valve type) to the vac fitting on the actuator. See how much PSI it takes for it to start to move and to fully open.

 

[David15151]

it is the original wastegate. good idea about the bike pump ill have to try that out. maybe i can find one at walmart heh