Quote:
Originally Posted by Sven7
My '65 Ford truck has these foot vents too. They are unbelievable compared to a modern car! I noticed that with no door speakers, my Civic also gets drafts in a similar area during high winds. I seriously thought about adding real vents down there, with an outlet at the rear of the car in the spare tire well or hatch. I imagine with a couple small NACA inlets in the very front of the doors and short ducts through the door cards, one could have really well (passively) ventilated car.
This would be more for comfort than efficiency because the Civic's ventilation sucks. Remember that every time your car moves air, whether around the outside or through the inside (with the fan off), it's creating drag. Maybe the foot vent method could be adapted, modernized and tweaked for efficiency, because it is a really great way to stay cool.
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With modern cars,EPA certification dynamometer loading presumes a drag coefficient with windows rolled up.Many automakers claim less mpg with windows down-ventilation vs windows-up air conditioning.
Honda's design may presume that you'll just use the air conditioner.
In the development of the GM Precept,cabin ventilation,as part of the total "features drag" hardly showed on the wind tunnel load cells.I personally don't believe it's something worth fussing over unless you're out to set a land speed record.