I have a Suzuki Hayabusa Super Bike which I have modified by installing a Turbo system (10 PSI Max Boost without water injection and without lowering Engine Compression).
And as far as I recall the math says 1 PSI = 14.1 HP
So 900hp-492hP= 408 hp
408 hp / 14.1 hp = 28.9 PSI
That is why I thought maybe it takes more than 10 PSI to get that power.
Anyway thanks for the info I am sure you know more than me