update

put a known working wastgate on,and dissconnected the pressure pipe to it.(so should get full boost regardless of amal etc..)

Still no joy,hits 20psi,then just drops of to 0,no pops,no bangs,its just like you take you foot of the floor,(but its still there)then just drives normal again.
Changed map sensor,act sensor,nothing,and now its pissing down,

Any more ideas