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No need for apologies. Fact is, you can read and quote compressor maps all you'd like but that's just one side of the equation in regards to turbo efficiency. What ultimately matters is what that turbo and setup can do for your application : in this case a HC DI motor like the FA20.
You could spool a bigger turbo up to 9k rpm to get your peak numbers at a lower boost at say, 8.5PSI - but everything else in between isn't going to be remotely interesting, much less usable. In this case, if you'd note the range between 3500 to 6700 RPM - it maintains well over 200#s of (usable) torque before hitting peak power.
If the turbo wasn't well matched or as efficient, we would have seen that torque line drop off much earlier and faster. Just my 2 cents!
Bob @ Drift-Office, LLC
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