There had better be more than just boost!!More like 2.4 bar (gauge), there's more than just boost.
However, I am not sure to what you are referring.
1) Compressor discharge temps?
Then, no you are wrong, it IS just boost and compressor efficiency (along with compressor inlet temp from which you start, of course)
I agree with you about the 2.4 BAR number, as that is what I have also been told and shall re run the numbers on that basis. (I'll post those separately)
2) Tuning, overall?
Well, yes, there is obviously more than simply boost; however when you cut out all the considerable tuning work necessary to "avoid", "get around" or "negate" all the fail safes the OE's have instigated in an attempt to prevent us from doing any of this, it all comes down to Ignition advance and Air/fuel ratio. (Not discussing drivetrain, of course, just the engine)
3) Eventual Power Output
Now, this is the interesting one and I hope the one to which you were referring in your cryptic response, as this is the subject which brought me onto the forum in the first place.
I want to know, where is the missing 200 BHP?