easy boost tip

have an 84 turbo-z. i'm looking a way to increase boost.If anyone knows this car and has any tips for me i would love some advice. i have some spare parts, including a tubo. i read somewhere the boost is mechanicly controlled at 7.5 psi. I would like to start simply like finding how to mod the waste gate up ot like 15 psi if i can.-thanks

You do not want to have the turbo boost reach 15 normally. Your engine will not be able to handle the pounds of thrust and you will blow your engine out.