A huge thanks to DrComputer on the Tesla Motors Club forum for posting his solution to this issue. My car also has exhibited a strange low pressure buffeting even when all the windows were open and the sunroof was open. I'm going to try this fix tonight and see if it solves the issue.
Originally Posted by UMD86
The analyst from Cars.com experienced the same thing I did when I test drove the Performance Model. Below is his article. Has anyone ever experienced the same thing? Does anyone know why this happens?
I noticed it in my other cars when I lower the rear windows only. It feels like your ears are clapping. I have to lower the other windows to prevent it. With the Model Perf. "S" it happens when ALL of the windows are up.
The ride quality is also firmer than I expected from a sizable five-seater; however, the Signature Performance I drove has 21-inch wheels; the lineup starts with 19-inchers. There was also a troublesome low-frequency resonance — a vibration felt more than heard — that was most pronounced on grooved-concrete interstate but which was also detectable at other times. It felt a bit like the pressure buffeting that sometimes happens when you drive with a moonroof open too far, but not accompanied by the higher frequency wind turbulence. I and a passenger — and another editor driving separately — found it terribly irritating.
This is concern for me. I will have to test drive both models before I finalize my order. I hope it's nothing major - I like the interior headroom of the perf. model.
(POST FROM DrComputer on the TMC Forum - This was one of the first problems I reported to Tesla. On my drive home from the factory I too noticed the horrible "pressure buffeting" when all of the windows and sunroof were closed. I tried several experiments to see if I lowered the windows slightly or opened the sunroof if it would go away. It didn't. After discussing it with the LA service center and them with corporate they determined this is a known issue and is actually caused by rear hatch. If you open the rear hatch you will find two thumb screw type rubber dampers on each side of the hatch by the edge (not the solid plates they press against on the car itself). If the screws are not far enough out the hatch acts as a large speaker bouncing up and down as you drive over uneven roads creating this uncomfortable pressure feeling. Adjust them out far enough so the hatch closes tightly but not too far where the automatic closer will not shut because there is too much pressure. This adjustment, in combination with the rear parcel shelf to absorb vibration, greatly reduces the pressure buffeting problem