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Originally Posted by MikeK
Nate (or anyone who knows),
I have a question about the dyno ... does it take into account the different gear ratios being used? For example, if there were 2 WRX's that produce identical power, but one had a close ratio gearbox, would the dyno take this into account and produce identical numbers for each? Or would the car with the close ratio gearbox appear to be more powerful?
Actually now that I think about it, the WRX and the STi have different ratio gearboxes. If you were testing in 3rd gear in a WRX (a ratio of 1.366) and 4th gear in an STi (a ratio of 1.346) does this mean that the STis appear more powerful than they are compared to the WRX?
Thanks!
Mike.
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IIRC, because the dyno is load based, it's not a matter of how fast you're turning the dyno's drums, it's actually a matter of how hard you're turning the drums. I think the dyno brakes the drums and measures the amount of braking force required to keep the drum at a particular RPM. Meanwhile the dyno is watching the car's
engine RPM so it knows where the motor's at in its powerband, effectively removing gear ratios from the equation.