Cabin noise

LakeShow · 10-01-2011, 07:17 PM

Quote:

Originally Posted by Red__Zed

I wouldn't trust anybody over there

You can't trust the370z.com because some people over there have traded the Z in for Mustangs. Lol jk.

Guard Dad · 10-05-2011, 02:37 PM

Update:

I've now had a chance to put a few freeway miles on the Z since adding Raamat to the cockpit floor and I'm happy to report that a noticeable improvement has been achieved. The low frequency resonance coming from the foot well has been reduced sufficiently as to be a non issue. The car is in no way a luxury cruiser but it is now possible to listen to the sound system at normal levels and conversation can be conducted in a normal manner.

The take away is as follows:

If the Z's noise environment is a problem for you (and for many of you it is not) I believe that I have identified a straight forward three step procedure for addressing you concerns.

1. Apply Dynamat Extreme or Raamat to the hatch, wheel wells and door panels for a big reduction in road noise. I'd do this one again in a heartbeat.

2. Apply Luxury Liner Pro to the hatch and wheel wells for a further reduction in road noise. This stuff is heavy and not cheap, I liked the subtle improvement, but I'm not sure I'd do it again.

3. Apply Dynamat/Raamat to the B pillars (to about shoulder level) and to as much of the bare metal under the carpet as is possible, for a reduction in resonance from the front of the car. This makes a nice improvement but is only worth doing if you are at least doing step 1. Without step 1 the cabin is too noisy to notice the improvement from this mod. This requires removal of a lot of the interior and is probably only worth doing if you are gutting the interior for an audio upgrade or similar mod. The actual amount of Dynamat/Raamat is about 24 square feet which equals about 12 pounds.

It has been pointed out by others that Dynamat/Raamat is a resonance reducer and not an especially effective sound deadener and that a mass-loaded-vinyl (Luxury Liner Pro is a MLV) is necessary to achieve meaningful improvements. My experience would suggest that Dynamat/Raamat is very effective in the Z. It is thin so it doesn't complicate reinstallation of the interior trim pieces. It is easy to install and bonds well to the structure of the car. It weighs about 1/2 pound per square foot. MLV's are about 1+ pound per square foot and are intended to be installed over Dynamat/Raamat and as a system system weigh 1.5+ pounds per square foot. MLV's are 1/4"-3/8" thick and can complicate reinstallation of interior trim pieces. MLV's have to be glued to the car and sometimes getting a good bond on a irregular surface can be a problem. MLV's cost at least 2-3 times as much as Dynamat/Raamat. In my opinion the big payoff is in the hatch and if I was doing a do-over I would consider a double layer of Dynamat/Raamat in selected areas of the hatch and skipping the MLV.

If anyone has questions please post them here or PM me.

UNKNOWN_370 · 10-05-2011, 02:57 PM

Quote:

Originally Posted by Guard Dad

Update:

I've now had a chance to put a few freeway miles on the Z since adding Raamat to the cockpit floor and I'm happy to report that a noticeable improvement has been achieved. The low frequency resonance coming from the foot well has been reduced sufficiently as to be a non issue. The car is in no way a luxury cruiser but it is now possible to listen to the sound system at normal levels and conversation can be conducted in a normal manner.

The take away is as follows:

If the Z's noise environment is a problem for you (and for many of you it is not) I believe that I have identified a straight forward three step procedure for addressing you concerns.

1. Apply Dynamat Extreme or Raamat to the hatch, wheel wells and door panels for a big reduction in road noise. I'd do this one again in a heart beat.

2. Apply Luxury Liner Pro to the hatch and wheel wells for a further reduction in road noise. This stuff is heavy and not cheap, I liked the improvement, but I'm not sure I'd do it again.

3. Apply Dynamat/Raamat to the B pillars (to about shoulder level) and to as much of the bare metal under the carpet as possible, for a reduction in resonance from the front of the car. This makes a nice improvement but is only worth doing if you are at least doing step 1. Without step 1 the cabin is too noisy to notice the from this mod. This requires removal of a lot of the interior and is probably only worth doing if you are gutting the interior for an audio upgrade or similar mod. The actual amount of Dynamat?Raamat is about 24 square feet which equals about 12 pounds.

See this is why in spite of my personal tastes. I respect all mods. One thing that bugs me is some of the sound that eminates from the wheel well. I may consider adding that lux liner to the wells only. It may reduce some of the tire vibrations and noise. For me the rest id leave alone, but that's me.

Thanks for the idea.

quick question though... do you think lux liner will reduce the pebble knocking as well? Everytime a pebble hits under there I think I broke something and slow down. Then realize... damn it was just a pebble in the wheel well. Lol

Guard Dad · 10-05-2011, 03:18 PM

Quote:

Originally Posted by UNKNOWN_370

See this is why in spite of my personal tastes. I respect all mods. One thing that bugs me is some of the sound that eminates from the wheel well. I may consider adding that lux liner to the wells only. It may reduce some of the tire vibrations and noise. For me the rest id leave alone, but that's me.

Thanks for the idea.

quick question though... do you think lux liner will reduce the pebble knocking as well? Everytime a pebble hits under there I think I broke something and slow down. Then realize... damn it was just a pebble in the wheel well. Lol

While you were posting I amended my post, check it out.

MLV's are great stuff and I've got leftovers if you are interested, but Dynamat/Raamat is outstanding for reducing sand and pebble noise and would be my runaway first choice in any sound reduction program. It's difficult to apply and bond a MLV to the complex shape of a wheel well. Dynamat/Raamat installs and bonds on wheel wells easily and this more than makes up for what it may lack in absolute sound suppression capability compared to a MLV.

brucelidat · 10-05-2011, 04:12 PM

Is Dynamat just some material you cut down to whatever size you need? How easy/difficult is it to install the Dynamat? How long do you think the install took? Will the Dynamat add much weight? If someone oculd post a DIY, that would be great! (If there is one already, sorry)

Thanks!

Guard Dad · 10-05-2011, 05:10 PM

This is a long th

Quote:

Originally Posted by brucelidat

Is Dynamat just some material you cut down to whatever size you need? How easy/difficult is it to install the Dynamat? How long do you think the install took? Will the Dynamat add much weight? If someone oculd post a DIY, that would be great! (If there is one already, sorry)

Thanks!

Dynamat and/or Raamat (D/R for short. Similar products from different companies, Raamat costs a little less, Dynamat is better known, they seem to be about equal in performance) is a DIY version (about 0.050"-0.060" of an inch thick) of the asphalt/rubber sound mat the factory installs on cars to suppress/reduce unwanted sound. D/R is self adhesive and foil backed. It is pliable and fairly easy to work with. It trims with household scissors or a utility knife. Do a search on this site or youtube for "Dynamat installation" for actual installation tips. Also you can review this entire thread for more details.

This is a long thread, check it out from the beginning. In prior posts I've discussed weight, coverage and cost in some detail.

kenchan · 10-05-2011, 02:50 PM

^^ nice post, guarddad!

harry370z · 10-29-2011, 04:58 AM

Does anyone know the thickness of Dynaliner I can get away with using?
I still want all trimmings to fit afterwords.

It comes in 1/8" 1/4" and 1/2"

How thick was the luxury liner pro you used?

ImportConvert · 10-29-2011, 08:26 AM

I have read on here that as the years went on, people noticed that the NVH got less and less in the 370Z's and Nissan added material. Fact or rumor?

kenchan · 01-31-2012, 01:30 PM

for pebble hitting noise i think i'd try the noise eliminator sprays you mentioned, bonzo.

they're usually sold at most autoparts stores.

Bonzo · 01-31-2012, 02:55 PM

Quote:

Originally Posted by kenchan

for pebble hitting noise i think i'd try the noise eliminator sprays you mentioned, bonzo.

they're usually sold at most autoparts stores.

Thanks kenchan. I'm thinking it's got to help at least some. Like if there was a separate plastic liner up there like on many cars, this wouldn't be a problem. A good thick rubber coating should act like a "bouncer" I would think. You can also buy it by the gallon and brush it on, which would go on thicker and faster. I'll have to pull the wheel anyway so I'm not sure which would be best.

Now I just need to think of whether I want to spend my weekend doing dynamat or not. I REALLY want to finish these Z projects up this weekend.

Thanks again.

BigT · 01-31-2012, 03:08 PM

I've had my car for almost 3 weeks now and the only noise complaint I have is tire noise. They are much louder over concrete vs pavement, loud on any surface in the rain, and despite the cold weather, they shoot up every loose rock, pebble, sand etc. However, its not terrible. For my own personal tastes, swapping to a different tire (when the time comes), will be the most I do to help noise.

RiCharlie · 02-01-2012, 07:23 AM

Quote:

Originally Posted by BigT

I've had my car for almost 3 weeks now and the only noise complaint I have is tire noise. They are much louder over concrete vs pavement, loud on any surface in the rain, and despite the cold weather, they shoot up every loose rock, pebble, sand etc. However, its not terrible. For my own personal tastes, swapping to a different tire (when the time comes), will be the most I do to help noise.

FYI I was just reading an review of the 2012 by Edmunds and it mentioned the loud cabin noise due to tires..

Strange how things are..that pebble noise doesnt bother me ..its just what happens when you go over sand..and that is not very often..but that constant droning of the wheels on the road, especially with the sports package, is intolerable ...to me anyway..and its louder if the road is wet... depends a lot on the surface of the roads,..,on some there is no noise at all..others its .horrible.. At first i was sick thinking i had made a terrible mistake..

.. i had my car dynamatted..hatch and doors ..( there is no sound dampening material at all in either area) If you can do it yourself you save a lot of money...i spent $1200 when people tell me the materials are about $200..

but its ok now and i really love this car! but i want more..so in two months I am getting new tires...as the ones i have came with the car and I am told that they only go to about 20-25K and i hit 20 last week..

I think i will go with the Continental Extreme contact DWS...from what i read its a good performer and also good on water and snow and are much quieter..

Bonzo · 02-01-2012, 09:16 AM

Quote:

Originally Posted by RiCharlie

FYI I was just reading an review of the 2012 by Edmunds and it mentioned the loud cabin noise due to tires..

Strange how things are..that pebble noise doesn't bother me ..its just what happens when you go over sand..and that is not very often..but that constant droning of the wheels on the road, especially with the sports package, is intolerable ...to me anyway..and its louder if the road is wet... depends a lot on the surface of the roads,..,on some there is no noise at all..others its .horrible.. At first i was sick thinking i had made a terrible mistake..

.. i had my car dynamatted..hatch and doors ..( there is no sound dampening material at all in either area) If you can do it yourself you save a lot of money...i spent $1200 when people tell me the materials are about $200..

but its ok now and i really love this car! but i want more..so in two months I am getting new tires...as the ones i have came with the car and I am told that they only go to about 20-25K and i hit 20 last week..

I think i will go with the Continental Extreme contact DWS...from what i read its a good performer and also good on water and snow and are much quieter..

Yeah, people are certainly different with their takes on this. Wow. Tire noise has never bothered me. Actually, to me it's something sports cars "should" have. I had one friend who loved it so much he never ever turned on his radio.

Anyway, not that you probably paid attention (since the incessant pebble banging doesn't bother you), but did the dynamat help at all with the sand/pebble/dirt noise?

Last night I decided to do a small little simple test. Using my hand I just started reaching under the car and knocking on it. What I found is the noise I am talking about is mostly coming from the rear wheel wells. When I rapped on those from the wheel side, the inside arches let out this loud tin like "plink." When pebbles hit it it sounds like a fully automatic BB-gun machine gun firing into the trunk. Not good.

So now I'm still thinking I should dynamat the wheel arches on the inside of the car now (while I have it all open), and then also paint the wheel wells on the outside of the car with rubberized coating to give it a more spongy/springy texture. I'm just still wondering if the dynamat might be a waste of time and money for the pebble noise.

Too bad Nissan couldn't charge us an extra $100 per car and have had plastic designed and produced for the wells. That would have eliminated most of the pebble noise I think, and also helped to isolate the road noise issue other have.

Thanks for anyone who can contribute to the dynamat helping or not with the pebble issue.

RiCharlie · 02-02-2012, 08:24 AM

Quote:

Originally Posted by Bonzo

Anyway, not that you probably paid attention (since the incessant pebble banging doesn't bother you), but did the dynamat help at all with the sand/pebble/dirt noise?

Well just to be clear..for me...there is no incessant pebble noise...its very rare..but i can certainly understand that if i had to listen to it constantly, that would be another story...because the few times I have encountered it ..it is loud..,.
.
You might just as well do what ever you can now that the car is open..=you might just as well try..and hopefully it will cut down on the racket..let us know..

..maybe you could install a large brush on the front of your car and sweep the pebbles to the side as you drive...

10-05-2011, 02:37 PM	#2 (permalink)
Guard Dad Enthusiast Member Join Date: Aug 2010 Location: South Orange County, CA Posts: 422 Drives: 2010 370Z Silver A7 Rep Power: 16	Update: I've now had a chance to put a few freeway miles on the Z since adding Raamat to the cockpit floor and I'm happy to report that a noticeable improvement has been achieved. The low frequency resonance coming from the foot well has been reduced sufficiently as to be a non issue. The car is in no way a luxury cruiser but it is now possible to listen to the sound system at normal levels and conversation can be conducted in a normal manner. The take away is as follows: If the Z's noise environment is a problem for you (and for many of you it is not) I believe that I have identified a straight forward three step procedure for addressing you concerns. 1. Apply Dynamat Extreme or Raamat to the hatch, wheel wells and door panels for a big reduction in road noise. I'd do this one again in a heartbeat. 2. Apply Luxury Liner Pro to the hatch and wheel wells for a further reduction in road noise. This stuff is heavy and not cheap, I liked the subtle improvement, but I'm not sure I'd do it again. 3. Apply Dynamat/Raamat to the B pillars (to about shoulder level) and to as much of the bare metal under the carpet as is possible, for a reduction in resonance from the front of the car. This makes a nice improvement but is only worth doing if you are at least doing step 1. Without step 1 the cabin is too noisy to notice the improvement from this mod. This requires removal of a lot of the interior and is probably only worth doing if you are gutting the interior for an audio upgrade or similar mod. The actual amount of Dynamat/Raamat is about 24 square feet which equals about 12 pounds. It has been pointed out by others that Dynamat/Raamat is a resonance reducer and not an especially effective sound deadener and that a mass-loaded-vinyl (Luxury Liner Pro is a MLV) is necessary to achieve meaningful improvements. My experience would suggest that Dynamat/Raamat is very effective in the Z. It is thin so it doesn't complicate reinstallation of the interior trim pieces. It is easy to install and bonds well to the structure of the car. It weighs about 1/2 pound per square foot. MLV's are about 1+ pound per square foot and are intended to be installed over Dynamat/Raamat and as a system system weigh 1.5+ pounds per square foot. MLV's are 1/4"-3/8" thick and can complicate reinstallation of interior trim pieces. MLV's have to be glued to the car and sometimes getting a good bond on a irregular surface can be a problem. MLV's cost at least 2-3 times as much as Dynamat/Raamat. In my opinion the big payoff is in the hatch and if I was doing a do-over I would consider a double layer of Dynamat/Raamat in selected areas of the hatch and skipping the MLV. If anyone has questions please post them here or PM me. Last edited by Guard Dad; 10-05-2011 at 03:07 PM.

10-05-2011, 04:12 PM	#5 (permalink)
brucelidat A True Z Fanatic Join Date: Jun 2011 Location: temple city, ca Posts: 2,432 Drives: 2011 370z 7AT GM Sp Rep Power: 32	Is Dynamat just some material you cut down to whatever size you need? How easy/difficult is it to install the Dynamat? How long do you think the install took? Will the Dynamat add much weight? If someone oculd post a DIY, that would be great! (If there is one already, sorry) Thanks! __________________ Works Emotion CR Ultimate - FI CBE w/ 18" resonators - Ecutek - eibach sways - Quaife - FI LTH w/race cats - kw v3 - spl - Topgunz SC - 488whp 398trq

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10-05-2011, 02:50 PM	#7 (permalink)
kenchan A True Z Fanatic Join Date: Aug 2009 Location: N/A Posts: 76,801 Drives: N/A Rep Power: 141522	^^ nice post, guarddad!

10-29-2011, 04:58 AM	#8 (permalink)
harry370z Base Member Join Date: Sep 2011 Location: Sydney Australia Posts: 67 Drives: Nissan 370z 2010 Rep Power: 15	Does anyone know the thickness of Dynaliner I can get away with using? I still want all trimmings to fit afterwords. It comes in 1/8" 1/4" and 1/2" How thick was the luxury liner pro you used?

10-29-2011, 08:26 AM	#9 (permalink)
ImportConvert A True Z Fanatic Join Date: Jun 2010 Location: SWMO Posts: 4,454 Drives: 2019 CX5 GT Reserve Rep Power: 7628	I have read on here that as the years went on, people noticed that the NVH got less and less in the 370Z's and Nissan added material. Fact or rumor?

01-31-2012, 01:30 PM	#10 (permalink)
kenchan A True Z Fanatic Join Date: Aug 2009 Location: N/A Posts: 76,801 Drives: N/A Rep Power: 141522	for pebble hitting noise i think i'd try the noise eliminator sprays you mentioned, bonzo. they're usually sold at most autoparts stores.

01-31-2012, 03:08 PM	#12 (permalink)
BigT Enthusiast Member Join Date: Jan 2012 Location: NJ Posts: 469 Drives: 98 2g DSM Rep Power: 15	I've had my car for almost 3 weeks now and the only noise complaint I have is tire noise. They are much louder over concrete vs pavement, loud on any surface in the rain, and despite the cold weather, they shoot up every loose rock, pebble, sand etc. However, its not terrible. For my own personal tastes, swapping to a different tire (when the time comes), will be the most I do to help noise.