to need a dyno, you'd need to have an engine building program like in the Bethesda drag racing game. Not the steaming pile they sell for the PS2 but the PC game. In that game you make your own cam profiles, change cam timing, change valve sizes, intakes, exausts, ect. and after every change you get a new power and torque curve graph. This is something i'd like to see incorperated into GT5.
Instead of a dyno in GT4 how about a skid pad? it'd be far more usefull than the dyno, what with the genaric mods allowed in GT.
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