I was on my way home today with all four windows and sunroof open in my car. I was on the freeway doing 85 mph and I looked in my rear view mirror and noticed my ceiling shaking. I put my hand on it to see if maybe my eyes were playing tricks on me, but they weren't. The ceiling was shaking up and down about a 1/2". I closed the sunroof but the shaking was still occuring. I then rolled up the windows and it went away. The only thing I could relate the problem to was the fact that a large volume of air was coming into the car since the windows and sunroof were open. Should I (or we) be concerned with this. If anything this would surely be embarassing if we had the car full of passengers. Any feedback would be appreciated. Thanks in advance.

 

I have been driving with all windows open plus sunroof open
for many months now, since the sweltering heat of Houston
has not yet begun. But NEVER at 85 mps. There is a
tremendous ammount of air beind "cupped" by the cabin
when all is open. Observe what happens at 45 mph. Bet it
is OK. Just don't drive so fast when the windows are open!
Speedy

2003 TwBlue 5AT Sedan, sunroof,
Graphite Leather, splashguards, HKS exhaust,
14 wire Grounding kit, 350Z duct, Stillen CAI
Underbody rear diffusers, Drilled alum pedals