I'm not a turbo guy so I can't understand how you can have 7psi in one part of the system and
only 2-3psi in another part ?? But leaving that aside, as I understand it, to get 7psi in the manifold
there has to be resistance to flow. That resistance is the turbo trying to push air into a cylinder
when the inlet valve is open and the outlet valve is closed. If for some reason, the outlet valve is
open at the same time as the inlet valve, then the charge air will pass right thru the cylinder and
the resistance to flow (=turbo pressure) will be less.
So my suggestion would be to check your cam timing and VVT operation to see if for some reason
you have a lot more valve overlap than you had before.
Cheers... jondee86
EDIT: Disregard the above. This answer only addresses a situation where a turbo cannot make boost.
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