991 Window Buffeting Solution
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Joined: Jul 2007
Posts: 2,869
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From: Ormond Beach, FL
991 Window Buffeting Solution
I am hearing stories of cars with sunroofs that go boom inside the cabin; either way, I am shocked that more people haven't experienced turbulent buffeting with both windows down in non-sunroof cars on the highway. I'm working on a solution hopefully in the $100-$200 range in carbon fiber or painted that will bolt on and solve this. Our car is a non-sunroof car for obvious reasons. I'm shocked at how severe the issue is at typical highway speeds. Now, if I could convince someone in Germany that the 997/987/991 hanging clothes hook on seat back or window is just plain unacceptable, we might get somewhere. And i thought Duallys were bad! We have no intended solution for that though! Sorry! 
Can we see a show if hands if you have experienced the cabin turbulence? PM for more info.
Thanks.
Can we see a show if hands if you have experienced the cabin turbulence? PM for more info.
Thanks.
Burning Brakes
Joined: Jun 2012
Posts: 752
Likes: 192
From: Melbourne, Florida
Mine is dual purpose street/track car with no sunroof and yes buffeting is an issue at the track. On the street I just close the windows. So a snap on solution for track days would be welcome. I don't need carbon fiber for track days. I was thinking about something simple built from an engineered plastic; small, light and cheap to make. My pre track day breakfast should weigh more than this solution. CF would be expensive and overkill.
Instructor
Joined: Jan 2011
Posts: 228
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Mine is dual purpose street/track car with no sunroof and yes buffeting is an issue at the track. On the street I just close the windows. So a snap on solution for track days would be welcome. I don't need carbon fiber for track days. I was thinking about something simple built from an engineered plastic; small, light and cheap to make. My pre track day breakfast should weigh more than this solution. CF would be expensive and overkill.
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Wordsmith
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Mine is dual purpose street/track car with no sunroof and yes buffeting is an issue at the track. On the street I just close the windows. So a snap on solution for track days would be welcome. I don't need carbon fiber for track days. I was thinking about something simple built from an engineered plastic; small, light and cheap to make. My pre track day breakfast should weigh more than this solution. CF would be expensive and overkill.
Everyone should be wearing some sort of earplug. The cabin of even the quietest road car at 120 mph with the windows down is deafening. Literally.
I guess the real solution is to put an end to this nonsense of defeating the safety of a modern car by compelling drivers to have the windows open.
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Poseur
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From: Santa Barbara, CA
Side windows down and sunroof closed I found that buffeting was really pretty bad in the 997 coupes. Doubt that has changed in the 991. Sadly, in 1978 when Porsche did away with the opening of the two rear side windows it eliminated a nice way to get air flow without buffeting.
Wordsmith
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Side windows down and sunroof closed I found that buffeting was really pretty bad in the 997 coupes. Doubt that has changed in the 991. Sadly, in 1978 when Porsche did away with the opening of the two rear side windows it eliminated a nice way to get air flow without buffeting.
I wonder if adding canards to the front bumper would disturb the air enough. Maybe combined with the spoilers on the back of the front wheel arches?
Surely somewhere along their millions of miles of testing, someone had to report "insufferably noisy buffeting at speed with windows down" but then, what was done?
Three Wheelin'
Joined: Feb 2012
Posts: 1,458
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From: SF Bay Area
"Chevy comes up with Volt mirror modification to stop wind thumping"
http://green.autoblog.com/2013/12/22...p-wind-thumpi/
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Last edited by fbroen; Mar 10, 2014 at 10:36 AM. Reason: link corrected
Racer
Joined: Apr 2009
Posts: 317
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Side windows down and sunroof closed I found that buffeting was really pretty bad in the 997 coupes. Doubt that has changed in the 991. Sadly, in 1978 when Porsche did away with the opening of the two rear side windows it eliminated a nice way to get air flow without buffeting.
I hope that John and the BGB guys can come up with something.
