woodyleaf
Posts: 2
Joined: Wed Jul 20, 2011 5:00 pm
Delivery Date: 25 May 2011
Leaf Number: 9040

Uncomfortable Road Noise

Wed Jul 20, 2011 5:24 pm

The road noise in my Leaf is very noticeable when I drive on pavement that has been chewed up by studded snowtires and I am driving at speeds over 30 mph. Since I commute on such at road for 9 miles each way at speeds between 45 and 60 mph, my ears ring terribly every time I get out of the car following this commute. This is due to a hearing loss problem I have. I have solved this in my Volvo by adding Dynamat and Dynapad insulation to the car. Before trying this expensive fix in the Leaf, I would like to know if anyone else has such a problem and if he or she has found something that reduces road noise in the Leaf. I have already swapped out the tires to the most quiet I can find with little benefit. Thanks.
Woodyleaf

Herm
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Re: Uncomfortable Road Noise

Wed Jul 20, 2011 8:39 pm

You could try lowering the pressure in the tires, it may increase the wear on the tires and decrease your range.

How about some custom molded silicon ear plugs or active sound canceling headsets?, such as target shooters use.

http://www.walmart.com/ip/Radians-Custo ... s/13023898

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garygid
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Leaf Number: 000855
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Re: Uncomfortable Road Noise

Wed Jul 20, 2011 8:52 pm

Such headphones are probably illegal (on both ears) in CA.
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evnow
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Re: Uncomfortable Road Noise

Wed Jul 20, 2011 9:38 pm

woodyleaf wrote:I have already swapped out the tires to the most quiet I can find with little benefit. Thanks.
Woodyleaf

Does playing music - and thus shaing the sound you hear in a different way - help ?

This is what I do to forget about the motor whine or the road noise.
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TomT
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Leaf Number: 000360
Location: California, now Georgia
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Re: Uncomfortable Road Noise

Tue Jul 26, 2011 7:55 am

I must have a different leaf than you guys. Mine is fine and quieter than either of my ICE cars (BMW and Acura)... I will admit that it DOES seem unusually loud on some road surfaces, however... I don't know whether this is tire related and/or due to a lack of suspension isolation, however...

raghuram wrote:Hi the information you have given is correct....road noise is really unbearable but we can't stop it....
Last edited by TomT on Fri Oct 14, 2011 2:54 pm, edited 2 times in total.
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johnr
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Leaf Number: 2151
Location: Exeter, CA

Re: Uncomfortable Road Noise

Tue Jul 26, 2011 8:31 am

Unfortunately road noise is something that seems to be unavoidable. I will say my own personal experience is that the Leaf has much less road noise than my previous car. But if you're transitioning from a high-end luxury car then your experience might be different. One solution is to play some music while driving down the road. Just stick in your favorite CD or pug in your iPod.
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woodyleaf
Posts: 2
Joined: Wed Jul 20, 2011 5:00 pm
Delivery Date: 25 May 2011
Leaf Number: 9040

Re: Uncomfortable Road Noise

Tue Jul 26, 2011 8:50 pm

This is to follow up on my post. I went ahead and put in Dynamat and Dynapad around the wheel wells and in all 4 doors. This reduced the noise somewhat. However, the truly bothersome pounding noise still will occur on really chewed up pavement (asphalt or concrete, usually torn up from studded snow tires and in need of resurfacing). Unfortunately, this is the condition of the road for my daily commute. At low speeds this is not so much of a problem. On decent pavement, the leaf is as smooth as glass. I have discovered that if I open the windows just a bit, the deep rumbling sound is less and it is not so painful on my ears.
All in all, the modification with Dynamat /Dynapad resulted in only a modest benefit, did not solve the problem, and probably was not worth the cost. (The same modification with Dynamat / Dynapad did shut down the noise from the same rough road surface in my Volvo S60 and that car is much quieter than the leaf even with the combustion engine.)
I think the acoustics in the leaf make it function more like a sounding board - such as in a guitar or drum - for the lower frequencies. This may be something the Nissan engineers may want to address at some point if marketing wants to make the quietness of the leaf a really strong competitive advantage. The car is otherwise whisper quiet. Higher frequencies are not a problem, there is only a breathy whistle when the pavement is smooth, and the motor produces a quiet high pitch hum at the most. People such as myself with hearing problems (and experts project that baby boomers will have a lot of hearing problems as they age) will find the low frequency noise in the leaf a serious dis-satisfier.
Woodyleaf

Yodrak
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Leaf Number: 402954
Location: St Louis, MO

Re: Uncomfortable Road Noise

Thu Jul 28, 2011 9:21 am

I think you're right. The Leaf might inadvertantly be 'tuned' to resonate to the noise frequencies caused by the road conditions that you encounter, perhaps due in part to the mass of the batteries and the structure of the car's floor to support that mass. Cracking the windows can affect the resonant frequencies.

Maybe some suspension adjustments could help, to minimize the transmission of the offending vibrations from the tire-road interface to the body of the car?

woodyleaf wrote:I think the acoustics in the leaf make it function more like a sounding board - such as in a guitar or drum - for the lower frequencies.
Khun Yodrak
2013 SL

DesertDenizen
Posts: 399
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Leaf Number: 314507
Location: Tucson

Re: Uncomfortable Road Noise

Fri Oct 14, 2011 2:44 pm

When I drive over roads with cracks in the pavement, around 30 mph with the window down, I hear both tire noise smacking the crack and a metallic clack as I drive over each crack. Maybe I should keep my window closed.
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ttweed
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Leaf Number: 1317
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Re: Uncomfortable Road Noise

Fri Oct 14, 2011 5:31 pm

Without the roar of an internal combustion engine to drown things out (admittedly my ICE cars are quite loud), I am definitely more aware of road noise in the Leaf, but only because it is more apparent due to the relative silence of the drivetrain. Overall it is a much quieter car than any other I drive, at least in my perception. I am a baby boomer with a hearing disability as well--exostosis (surfer's ear), so maybe I just can't hear what you're experiencing, and don't drive roads that are chewed up by snow tires.

TT
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