How to read compressor maps, and size up a turbo.

AHHH i figured it out but it keeps going off the chart when i do 50% max. Can some one help me out? PLEASE. Ok a guy with a t3/t04e turbo 57 trim made 438rwhp at 24psi. So would I put (24+14.7)/14.7? Thats wha ti put and it came out to 2.6. So 2.6 is part of the first point. Second (2.0x7400x95x2.6)/5660=646. 646x.07=45. half of 45 would be off the chart. I DONT GET IT.