engine dyno simulater

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well i have tried it by just changing my heads to ed performer rpm and a aderson n 41 cam i should be at 362 hp at 5800 rpm and 366 torque at 4400 but need to know how much drivetrain loss i need to subtract because hp & tq are at the motor not wheel..
 
I've got a program, i believe it's called Desktop Dyno....i've tried it a few times but it always seems really optimistic to me. Plus once you factor in things like porting and air quality it really starts getting vague.