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Originally Posted by brewtoo
Very good. Most people don't realize this. However, I was taught that when the speed doubles, the force of the wind quadruples (X4, not X5).
Also, does your car require WOT at 70MPH? If so, wouldn't 70MPH be your top speed?
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I forgot the WOT portion of this question.
The data reported for engines is typically reported at WOT but does not have to be. On an engine dyno the throttle postion is set usually to WOT and the engine external load is varried. Different loads will allow the engine to spin at different RPMs for the given throttle setting. The data for the engine is than maped at each load level where RPM, Torque and fuel cunsumption are measured. From the torque and RPM measurements HP is calculated. From the calculated HP and fuel cunsumption SFC is calculated.
Most cars do not require WOT to go 70 mph, therefore the best SFC map for an installed engine would have to come from a part throttle dyno run. In this part throttle dyno run the RPM where SFC is minimum would most likely be lower than the RPM for best SFC at WOT.
John Roncallo