Quote:
Originally Posted by bgsquad
mmmm, maybe you're right, but i'm not that conviced. the shade is not air tight, and air can be sucked from around the mechanism...
as for vent holes in other cars, this is to keep the ventillation without having the sun getting inside... but why BMW did not do that? obviousely they were thinking of something more than venting without sun or releasing pressure (if what you suggest is right) that's why i thought that they were thinking about forgetting it in vent position when rain starts to pour. if this third reason is not right, they would have done the holes like other cars....
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even though it's not air tight, it doesn't mean there's no forces involved. based off your logic, the only way a house vacuum would work is if the opening is completely plugged. were also talking about a very thin layer of fabric for the shade. it won't take much force to break it.
BMW does have the holes when you have the sunroof vented - it opens up between the front and rear sections of the shade. I always found the Audi/VW shades annoying, because you always get some light through them, even if the sunroof is completely closed.
the venting for rain should not be an issue. when driving in rain, water travelling backwards through the vent should not be a big concern (unless you drive in reverse). the X5 has the rain catches under the vent openings.