jwallace3
Posts: 156
Joined: Thu Apr 28, 2011 9:35 am
Delivery Date: 01 Aug 2011
Leaf Number: 6014
Location: Tennessee

Re: Rear windows down - interior noise and air pressure puls

Mon Jun 06, 2011 11:20 am

My 2004 Dodge Ram does this terribly if the rear windows are rolled down and front are closed. Feels like its going to blow your eardrums it's so bad, however, my Wife's 2007 Lexus RX-350 barely buffets at all for the front or rear windows.
Reserved: 9/22/10
ESVE (EV Project) Approved: 3/24/11
RAQ: 3/28/11
Ordered: 3/29/11
Blink Install: 7/20/11
Delivery: 8/4 -> 8/5 -> 8/11 -> 8/4 ->8/5 -> 8/3
Took delivery 8/6/11 Super Black SL-e
VIN: 6014

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OrientExpress
Posts: 1529
Joined: Sun Aug 08, 2010 12:22 pm
Delivery Date: 10 May 2011
Leaf Number: 2331
Location: San Jose, Ca

Re: Rear windows down - interior noise and air pressure puls

Mon Jun 06, 2011 12:44 pm

The phenomena that you are experiencing is called a Helmholtz resonance.

It is exactly the same effect that is the basis for wind instruments like flutes, or an empty bottle. Every car has this issue when air passes over an open window. The way to avoid the sound is to change the natural resonance of the cabin by opening or closing the windows of the car.
2018 LEAF SL
Gun Metalic
Delivery April 10 2018

Prior LEAF:
2014 LEAF SV
Ocean Blue
Delivery May 23 2014
50,000+ miles - all 12 bars - Same range as new - No warranty issues ever!

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davewill
Posts: 5081
Joined: Thu Mar 17, 2011 6:04 pm
Location: San Diego, CA, US

Re: Rear windows down - interior noise and air pressure puls

Mon Jun 06, 2011 12:49 pm

OrientExpress wrote:The phenomena that you are experiencing is called a Helmholtz resonance.

It is exactly the same effect that is the basis for wind instruments like flutes, or an empty bottle. Every car has this issue when air passes over an open window. The way to avoid the sound is to change the natural resonance of the cabin by opening or closing the windows of the car.
I just got a weird picture of a "roof flute" where I drill a bunch of holes in the roof and install valves to remote control from the steering wheel, and then play Bach's 3rd Brandenburg...
2014 Rav4 EV, Blizzard Pearl White
2011 LEAF SL w/QC, Blue Ocean, returned at end of lease

derkraut
Posts: 1518
Joined: Fri Jul 16, 2010 7:39 pm
Delivery Date: 14 Jun 2011
Leaf Number: 004248
Location: San Diego vicinity

Re: Rear windows down - interior noise and air pressure puls

Mon Jun 06, 2011 2:28 pm

davewill wrote:
OrientExpress wrote:The phenomena that you are experiencing is called a Helmholtz resonance.

It is exactly the same effect that is the basis for wind instruments like flutes, or an empty bottle. Every car has this issue when air passes over an open window. The way to avoid the sound is to change the natural resonance of the cabin by opening or closing the windows of the car.
I just got a weird picture of a "roof flute" where I drill a bunch of holes in the roof and install valves to remote control from the steering wheel, and then play Bach's 3rd Brandenburg...
Now, isn't it AMAZING what you can learn here on this forum? I am overwhelmed, and fighting back tears! :lol: :lol: :lol: :lol: :lol: :lol:
Derkraut
Color: Cayenne SLE, ETEC trim
reserved: 5/15/2010
Leaf del. 6/14/2011
New Traction battery installed on 7/28/2017:

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