Hard to say without knowing what the control box is doing. With no box effecting fuel cut, from memory boost wise you are looking at 4.1v of 5v= 0.82 x 1.2 kgf/cmsqd = 0.984kgf/cmsqd = 13.99psi would say at little less timing than the later manual ecu.
This is the older style ecu that with stock boost does both auto and manual.
Looking more closely at the box photo I wish I had one of these it says SPEC:W , No: P255AW
In other words - Power 255 at the wheels.
( Which on a 4Efte would point towards ct26 airflow manual car with raised rev limit)