I'm just throwing out my opinion, but doesn't the program simulate an engine dyno? How could this really be compared to a chassis dyno? I think this is why some people that have had there car dyno'd might see numbers real close or some real far off. Not every car has the same HP/TQ loss through the drivetrain. I've notice with the program when using an EFI intake option you really have to play with the CFM numbers. Motion Software really needs to put different intake options on the EFI (i.e. Street, Track or Race runner length). The Carb. option is pretty close with Duel, Single, Tunnel Ram.
Murdock
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