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Q: |
As far as the aero factor goes, is there any correlation to the coefficient of drag for a vehicle? For example, my car is a 0.36, whereas a BMW 3-series is a 0.28. |
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A: |
The coefficient of drag is part of
the rolling losses equation for sure, but other factors also
play a part. The method we use starts with a
polynomial equation for rolling losses for a vehicle. The
factor entered into the software is plugged into this equation
to arrive at all rolling losses values from 0-MPH through
the maximum MPH of the dyno. The factor is the hp losses
at 50-mph, one point on the MPH losses curve. The
rest of the losses curve is extrapolated via the polynomical
equation. The methods employed by our system were
established by the Society of Automotive Engineers (SAE)
and the EPA.
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