No worries buzzed,
Cool project. As for the Rotary statement, you know what I mean. Everyone knows it has four "
strokes", but it puts out
3 power strokes per shaft revolution vs 1/2 for a typical 4-stroke. So, point being was how it flows gasses (similar to a 2-stroke,
which puts out 1 power stroke per crank rev).
Speaking of flowing gasses, Garrett uses lbs/min and Mitsubishi uses cfm. Carburetors use cfm, injectors lbs/min. Wheels in inches and tires in milimeters. They can all be converted for easy use in formulas. However, speaking in terms of boost alone means nothing as a Garrett GT T3-60 trim will flow ~490cfm at 14.7psi and a Mitsubishi TD06-18G will flow ~590cfm at 14.7psi. Big difference.
BTW - I too use lbs/hr (turbo flow) in the math equation because that's how the injectors are rated. But conceptually, I can grasp cfm better when it comes to air. Bottom line: you gotta burn the fuel to make the power, and to burn fuel you need oxygen. "Boost" is useful after the turbo is chosen and characteristics known.
I'm definitely with you when it comes to magazine and crank HP. I was kinda doing the same thing (regarding driveline losses). You stated your target at 350 rwhp, so I added ~25 to get crank HP. Then worked backwards to come to the ~38lb/min of air flow you mentioned. That put me in the same spot on the flow map you mentioned as well (PR of 2.7, upper right hand side extent of the peak efficiency island). The turbo you chose is clearly holding VE at that point. I don't know if I'd want to be so close to the choke line. Though with just 2L spinning her up, and the right turbine trim and housing, you shouldn't get there till your upper engine RPM anyway. So, in all likelyhood a good choice.
My concern is the high boost with this engine, not to mention the combustion pressures.
Since you're running the SC, couldn't you afford to wait longer for the turbo to spool-up, and use a bigger one which will arrive at 80%VE and push your 38lbs/min at just 1-BAR (PR 2) comfortably, and w/plenty of "head room"?
Granted, not all these maps are 100% accurate. This GT28R 60mm, 60 trim .60 A/R is
too much turbo, but you see what I'm getting at?