thanks for the info, the reason i want the motor to handle the 14psi is that i struggle to throttle the turbos back from that sort of level

i've always had the problem of injectors maxing out, i suppose this is terrible for mixtures and probably the cause of detonation?

the tune up has never been that great which i put back to the choice of workshop to tune it, but i never wanted to spend the right money to tune it properly until i fixed up the injectors and other problems