Just read the origianal post!!! You can't put the ecu from a S2 into a S1

Did you put it a S2 ecu into a S1?? Bit confusing up there

If so I think one of the reasons it won't work is that it won't have the knock sensor!!! It is operating in a safety mode kind of thing and won't be using the amal valve which electronically controls the boost hence you are only getting 8psi from the actuator!!

Take it to a tuner