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Hi All,
I have had the experience of sitting in the rear seat of a New Beetle, as it accellerated. Above 45 mph, a turburlence-like noise was heard from ear level just on the other side of the C pillar. I think the flow seration begins there.
This is very much unlike the flow pattern shown on the first page of this thread. The actual turbulence begins about 2/3's the height of the car at the C Pillar and around the back.
The first thing to try is to put Turbulators vertically on the C Pillars, and then horizontally across the rear window area.
How far forward to move them is going to need to be experimentally determined.
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