blackleaf
Posts: 46
Joined: Mon Feb 07, 2011 6:24 pm
Delivery Date: 29 May 2011
Leaf Number: 1389
Location: Kirkland Washington

Rear windows down - interior noise and air pressure pulsing

Sat Jun 04, 2011 3:23 pm

Anyone else have a car where if you have the front windows closed and the back windows open on both sides, it really sets up a harmonic pressure pulse at around 50 - 60 mph that shakes the whole interior? I'm wondering if this is a result of the fancy headlights that are supposed to set up an airflow path around the vehicle to minimize noise, but may do so by creating a pair of vortices (little tornadoes) off of the head lights.

It's quite impressive, you can't just let it go it shakes an empty passenger seat back and forth an inch or so!
Black Leaf
delivered May 29, 2011
Kirkland Washington

DarkStar
Posts: 2066
Joined: Sat Jul 17, 2010 10:06 am
Delivery Date: 25 Mar 2011
Leaf Number: 568
Location: Hillsboro, Oregon, USA
Contact: Website

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

Sat Jun 04, 2011 3:42 pm

The effect is called buffeting and occurs on most modern vehicles, especially ones that are designed to be aerodynamic.
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Lopton
Posts: 206
Joined: Mon Aug 30, 2010 7:21 pm
Delivery Date: 04 Dec 2015
Leaf Number: 300864
Location: San Fernando Valley, CA

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

Sat Jun 04, 2011 4:18 pm

My Honda Insight and Leaf both do it very noticeably. I have learned to minimize it by adjusting all 4 sets of windows down by about the same amount. Once you get them right it goes away completely.

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blorg
Posts: 275
Joined: Thu Aug 12, 2010 9:48 pm
Delivery Date: 26 Jun 2015
Location: Seattle Metro Area

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

Sat Jun 04, 2011 10:23 pm

I noticed this today. It's amazingly powerful! My Murano does this to a lesser extent but only when both front windows are down and the rears are closed. The leaf it's the other way around. But if you open the front windows just a bit, it seems to stop buffeting.

Scared the living crap out of me as I pulled onto the freeway. It really seemed to shake the whole car. Far more powerful that I've noticed on any other vehicle.
~ Blorg
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2017 Nissan LEAF SV

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turbo2ltr
Posts: 1376
Joined: Fri Jul 30, 2010 11:13 pm
Delivery Date: 04 Feb 2011
Leaf Number: 185
Location: Phoenix, AZ

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

Sat Jun 04, 2011 10:40 pm

My grand cherokee does it bad as well. So weird since if you just crack one front window, it completely goes away..
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Christopher
Posts: 118
Joined: Thu May 05, 2011 4:51 pm
Delivery Date: 04 May 2011
Leaf Number: 1407
Location: Santa Cruz, CA
Contact: Website

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

Mon Jun 06, 2011 10:06 am

Oh yes, this is hugely common and I would saying nothing to do with aerodynamics. Every car I've owned that had back windows did this, including my 2000 4Runner. You have a car that doesn't do this?!? I suppose if you had a broken tail window all the air would just flow through... ;-)

The "trick" is just to use a combination of left and right window opening where you don't get the buffeting. Typically opening one window more than the other or partially opening one of the front windows will prevent the buffeting. Not really much of a trick, eh?

thankyouOB
Posts: 3583
Joined: Mon Feb 21, 2011 11:14 am
Delivery Date: 30 Apr 2011
Leaf Number: 1442
Location: Coastal LA

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

Mon Jun 06, 2011 10:22 am

If you open the sunroof venting backwards, it goes away, too.
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daleph
Posts: 22
Joined: Mon May 16, 2011 1:32 pm
Delivery Date: 27 Apr 2011
Leaf Number: 5642

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

Mon Jun 06, 2011 10:35 am

My 2006 Audi A8 does it terribly too...

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z0ner
Posts: 497
Joined: Wed Jul 07, 2010 10:16 am
Delivery Date: 18 Apr 2011
Leaf Number: 0909
Location: Orange County, CA

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

Mon Jun 06, 2011 11:07 am

I was just about to post the same question. If I lower one rear window it's bad - if I lower both, then the pulsing and pressure is quickly overwhelming. Cracking the fronts made it go away but I'm surprised I haven't seen it posted here until now. I've exprienced this before in a few cars, but not even close to the eardrum blowing levels in the LEAF.

smkettner
Posts: 7391
Joined: Mon Aug 09, 2010 10:13 pm
Delivery Date: 26 Feb 2014
Location: Orange County, CA

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

Mon Jun 06, 2011 11:12 am

The rear windows roll down... I would have never known :roll:
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