Quote:
Originally Posted by aerohead
1) altering the road load at any given throttle setting can cause the engine to perform at a less efficient manner.
2) Unless the engine is loaded ( through gear-matching), it will operate at this diminished efficiency.
3) You could lower drag by 30% and you'd never know it.
4) It's the thermodynamic efficiency of the engine which is called into question.
Just sayin'
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I don't think you understand very well what is being described by throttle stop testing. We're talking changes in engine rpm of 40 or 50 rpm - basically inconsequential in terms of torque change. (And it's torque we're working with in this case, not power.)
But hey, don't take my word for it. Go and do some testing yourself, eg windows up / windows down and see if the measured drag changes matches what you'd expect in the two different configurations. Practical testing, not just theorising.