OK, I did some calculations using an assumption of VE = .8 and intake air temp = 190*F

I come up with a PR of 1.47 for 7 PSI and 1.68 for 10 PSI

Calculated CFM as 274 @ 3600 RPMs (HP peak) and 121 @ 1600 RPMs (torque peak)

Assuming it will build 8 - 10 PSI at 1600, as well as at 3600 RPMs, I came up with air flows of
22.6 lbs/min @ 3600 RPMs and 9.2 lbs/min @ 1600 RPMs for 10 PSI
and
20.6 lbs/min @ 3600 RPMs and 9.1 lbs/min @ 1600 RPMs for 8 PSI

Plotting those four PR vs. lbs/min points on the map for the T3 60 trim (I'm pretty sure that is what the turbo this guy is selling is since it is the stock unit off a 2.3 liter turbo mustang) looks like the attached.

That's my first stab at it, and to my uneducated eye, it doesn't look too bad. The points are all in the 65-70 efficiency range, and the area between them takes up a big chunk of the 74% peak efficiency range of the map. Where am I going wrong here?

Attached Thumbnails

 

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1984 300 Coupe TurboDiesel
Silver blue paint over navy blue interior
2nd owner & 2nd engine in an otherwise
99% original unmolested car
~210k miles on the clock

1986 Ford F250 4x4 Supercab
Charcoal & blue two tone paint over burgundy interior
Banks turbo, DRW, ZF-5 & SMF conversion
152k on the clock - actual mileage unknown