stock wastegate boost is 10 psi. using profec b to up boost to 15 psi. the problem is that boost swings up to 10 psi and then struggle to 15 psi. now the other odd problem is that after I shut off the profec b to run stock wastegate boost (10psi), the same thing happens again. it swings to 10 psi and struggle to 15 psi ! and the boost controller is off!! is my wastegate gone bad??

 

if you have a 10psi spring in your wastegate then it shouldnt creep up to 15psi, unless your wastegate is broken.