Turbo and tuning set ups

[silverzx]

Wats a safe psi I can put into engine without problems

PSI doesn't mean anything.

A tiny GT15 pushing 40PSI isn't equal to a TD04L pushing 40PSI.

As a rule of thumb the bigger the turbo, the less PSI you need to run for similar power then smaller turbos.

So not exactly correct but a T2 running 26 PSI might be equal in terms of power to a T25 running 16 PSI. Obviously the power delivery is going to vary turbo to turbo and pump to pump (amongst other things).