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Old 05-25-2010, 04:51 PM   #1 (permalink)
lunarhighway
Master EcoModder
 
Join Date: Feb 2008
Location: belgium
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vectra a - '95 Opel Vectra GLS
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do ventilation intakes add to drag?

i'm talking about the vents in front of the windshield.

my reason for asking as that i recently noticed on my car the intakes are in an odd location. the car's hood kicks up a bit near the windsield and thus forms a bit of a recess where the wipers sit = good. however the actual intakes are locates at the outer edges near the a pillars, and the plastic covers actually show these intakes being ducted to the center where the ventilation fan motor is.

this seems a bit odd as i would assume that the high pressure bubble is strongest at the center/base of the windshield and not near the sides at the A-pillars where the air accelerates to move around the car. Also the fact that the intakes and ducts are the same piece of plastic, just changing the locations of the holes would do the job (and drilling or cutting holes would still do).

why this bothers me is that i have to run the fan most of the time to get some air in the car while my previous car had the intakes where i think they should be, and ventilation was much better.

any thoughts on this?

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