Cabin noise

RiCharlie

Same story here!! D dry W wet and S snow..

hadokenuh

Thanks!

rebe945

Makes a difference. My Hankooks are so much more quieter than the Yokohamas

Pauly

i think kenchan has a g35 and a Z. you could PM him

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Gun Metallic 2012 370 Z 7AT

Magic Bus

Dwight, your explanation of strip the carpeting and mat out of the trunk and fold down the rear seat was excellent. Thanks for your help.

rebe945

a dynamat like product and some carpet insulation over the sound deading material. Gee I did that and the noise is fine. On asphalt, its as quiet as any car ive driven.

wilsonp

Red Barchetta is definitely set in the future, so I always take it to be a hovercraft / spinner like Blade Runner.

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2014 Cayman S PDK Sport Chrono White/Black
Was 2009 370Z Touring Sport+Nav 7AT Metallic Black/Persimmon
Was 1991 NSX Auto Black/Black

cossie1600

I did a long drive today, car was above 80db+ (indicated on my phone) @ 75mph 6th gear cruise, definitely loud

psibrr

read the whole thread, long as it was. thx for all the prose and pics.
might try the rubber matting ritual ..

haven't had problem with tire noise per se, the 19's are 12 lbs ea. lighter than the 18's on the 350, so expected higher frequency road resonance. i like the feedback, can tell difference between yellow and white paint, which is useful.

seen too many references to 60mph levels. btw, dealers only test to 70, so my issue not addressable by them, which is more triple digit.

my 08 350e mt cruised fine at 135, no bassy drone. but 370/sp is droning w/ horrible booming from 90 up.. starts getting loud @95, and just increases, 130sounds like one is inside a fully loaded 4 prop b-52 bomber. maybe tires are main culprit.

wonder if hatch < the door that's raised with the window in it> could be packed inside with dynamat stuff, along with trunk surfacing?

once, maybe 3 decades back, read in a car mag that the ticking heard in the jag sedan was courtesy of 500 lbs of wool. today we have rubber with air cells etc. so 20 lbs or so for acoustic control isn't much in comparison even if it doesn't get the tick tock.

with xtra 20HP from straight H exhaust one could use up to 190 lbs of acoustic insulation, and keep same weight / power ratio as with stock zero; 500 lbs would require 380hp

RiCharlie

Tell me about this ap that you have that measures sound levels..sounds interesting...

rebe945

I was wondering who that was. Nice

Magic Bus

I dynamatted the doors & trunk this past weekend by myself. Took about 6 hours total and costed $160 for dynamat & tools. Bought the 7 sheet pack from Amazon, that's more than enough.

It does reduce cabin noise by about 10 - 15% (yes, scientific personal ear reading, lol). I was hoping for a little more but overall happy with the time & money invested in this project. Stereo sounds better and gravel/rain hitting tire wells is reduced by more than the numbers listed above.

I agree with many previous posters on this thread, stock tires are the main culprit for the road noise. However, no plans to change them out until they wear down.

Bandit_Kaine

I'm adding damplifier pro to my hatch and second skin spectrum over that, and more spectrum on the outside to whatever areas i can get to, probably just the wheel wells and under where the exhaust is. Then adding a layer of luxury liner pro on top of all of that and some dense foam into all the nooks and crannies that i can get to. and then a layer of foam just right under the top layer of carpet in the hatch.. I'm working on it should be done in about 2-3 weeks when i have time.. i'll post back on how my perception in sound noise is. I hope it makes a good improvement, the little rocks in a can noise back there is driving me crazy.

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rebe945

Nice job. I simply used a product called Frost King from Lowes, added a insulated light blanket wrapped around where the spare was( took it out) and replaced the tires with Hankooks.Absoltely satisfied. Quiet.

Haboob

I had a feeling the main culprit was the tires.

I dread the day I have to change them out though (for the price), but I'm sure I'll be happily surprised.