Hello can someone give me some ideas of what can be wrong, im running external wastegate with 11psi spring the problem im having is it will only boost 9psi an not opening the screamer pipe an no matter what i do i cant make enough boost to open wastegate. i have put 3 dif springs in 9psi 14psi and 18psi an everytime it will run 3/4psi under the rated spring pressure ant idea as its starting to do my bloody head in. Oh im running without boost controller just piping it straight from turbo to bottom of wastegate