Cabin noise

UNKNOWN_370 · 10-02-2011, 11:32 AM

Quote:

Originally Posted by Mt Tam I am

Changing the tires to Michelin Pilot Sports has changed my life. The little lady no longer mentions road noise and drone. The number one complainer outside "the forum".

Even better is the handling. The Potenza's were fine. These are better. I doubt I will ge

t the 7200 miles out of the Michelin's like I did the Bridgestone's. They are so soft.

That's what I intend to do. I'm seriously looking into pilot supersports. But the reviews since january of 09 have stated this car has a ridiculous amount of cabin noise, whether reviews were positive or negative,cabin noise has been conclusive in every review so, why buy?
Red Zed, on 1 test drive I knew the Z was loud. I cranked up the bose/nav all the way and still heard NVH. I hit 105mph on my test drive because I wasn't walking away not knowing all those little things. I can understand buying this car in 09 and the NVH issues not being so real to buyers. But 2010??? No excuse for not knowing this. So I see where luna Z is coming from.
I still stand by the fact that I respect any mod and modding for comfort is fine. . Its just complaining about a known fact is pretty dumb. I owned a G37s and I gotta say, the difference in general performance is negligable. You barely feel a difference until you start hitting corners at high speed and steering feel has some more heft on the Z. Get wider tires and they feel heavier.
The G is quieter, has way more features, has 2 extra seats and leather is standard. Looks ridiculous with a 1.5 or 2inch drop and spaced. Even accel times aren't much worse, 4.9 on the auto vs 5.2 on the manual. Just a tick slower than the Z's 4.6 and 4.9 with lateral grip matching a base Z with .94g. They get even closer on the quarter mile and the exhaust sounds better.

Me personally, I wanted a smaller pkg. Dfw highway driving is like being in a war on wheels, so having the maneuverability of a small car was better for me. But contrary to most of the exaggerations on here between the Z being sooo much better. I think they are pretty even for people just looking for a fun to drive car that you intend just to speed every now and again and drive a little aggressive. Which is what most of you guys do anyway.
In a G,NVH is very good and has 100lbs of insulation the Z doesn't have. Lol. I recommend a G before a BMW. At least you get a real lsd and sport brakes, something bmw doesn't provide for there so called sport coupes. Add an oil cooler and you're good to go.

LunaZ · 10-02-2011, 12:21 PM

Quote:

Originally Posted by UNKNOWN_370

I can understand buying this car in 09 and the NVH issues not being so real to buyers. But 2010??? No excuse for not knowing this. So I see where luna Z is coming from.
I still stand by the fact that I respect any mod and modding for comfort is fine. . Its just complaining about a known fact is pretty dumb.

This.
If it bothers you, then mod/fix it and your problem is solved.
If you've been caught off guard by the cabin noise, you didn't do your homework before buying. If a quiet cabin is high on your list of priorities, the 370Z is probably the wrong car for you because sound deadening is not one of its strong points. Even with a full treatment of Dynamat and other sound deadening materials, it will still be louder than something that was designed with a more luxurious intent.

Again, it's all relative and a matter of personal taste. While the dB meter might say it's loud inside my car, it's not nearly as annoying to my ears as my working environments which include a salon filled with a bunch of gossiping women trying to talk over blow dryers and convention centers with a bunch of haircare manufacturers trying to drown out each others stage presentations.
Maybe I just like how much noise my car makes because I feel like it replaces the testosterone I lose on a daily basis at work

UNKNOWN_370 · 10-02-2011, 01:40 PM

Quote:

Originally Posted by LunaZ

This.
If it bothers you, then mod/fix it and your problem is solved.
If you've been caught off guard by the cabin noise, you didn't do your homework before buying. If a quiet cabin is high on your list of priorities, the 370Z is probably the wrong car for you because sound deadening is not one of its strong points. Even with a full treatment of Dynamat and other sound deadening materials, it will still be louder than something that was designed with a more luxurious intent.

Again, it's all relative and a matter of personal taste. While the dB meter might say it's loud inside my car, it's not nearly as annoying to my ears as my working environments which include a salon filled with a bunch of gossiping women trying to talk over blow dryers and convention centers with a bunch of haircare manufacturers trying to drown out each others stage presentations.
Maybe I just like how much noise my car makes because I feel like it replaces the testosterone I lose on a daily basis at work

The last part of this thread is one of the funniest things I've read on the forum!

There's a huge upside to working in a salon though... I know the hot women ratio must be descent.

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.

kenchan · 10-05-2011, 02:50 PM

^^ nice post, guarddad!

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.

harry370z · 10-25-2011, 07:50 PM

Quote:

Originally Posted by Guard Dad

Hi everyone. Some months ago I mentioned that as part of of an audio upgrade I was going to add more sound deadener in the cockpit area, well I'm back to report the results.

As some of you know I've been aggressive in reducing the road noise in the Z. In the hatch I've applied generous amounts of Dynamat Extreme and covered most of it with Luxury Liner Pro. I've also applied Dynamat Extreme to the doors.

My most recent addition was to apply Rammat (essentially Dynamat Exterme from another supplier) on the bare metal of the cockpit floor. To do this I removed the seats and pulled the carpet back as far as possible. I was not able to apply Rammat to the top of the console and more than about 6-8" above the floor in the foot wells.

My observations are as follows:

Dynamat Exterme in the hatch and doors, approximately 38 square feet total: Huge improvement, modest cost, modest additional weight, modest degree of difficulty. Well worth the trouble.

Luxury Liner Pro in the hatch, approximately 20 square feet: Limited additional improvement over the Dynamat Extreme alone, this stuff is heavy. Probably not worth it unless the noise is a real issue for you.

Rammat on the cockpit floor, this requires removal of the seats, approximately 20 square feet: Rammat seems like a quality product but the improvement is this case was barely noticeable (the factory has already installed significant sound deadener on the cockpit floor) and is limited to a slight reduction of an annoying resonance from the foot wells that really wasn't noticeable until the application of the Dynamat Exterme and Luxury Liner Pro in the hatch. Probably not worth the trouble unless you are gutting the interior for some other reason.

The take away: Apply Dynamat Exterme or Rammat to the doors and hatch for a big noise reduction and only do more if you really feel the need.

By hatch do you mean boot?

Guard Dad · 10-25-2011, 10:16 PM

Quote:

Originally Posted by harry370z

By hatch do you mean boot?

In the U.S. the cargo area in a Z coupe is commonly referred to as the hatch and in the roadster it's usually called the trunk so take your pick as to which one would apply in your case. I have accumulated a fair amount of experience with the coupe but haven't done any work on a roadster although much of what I've learned should apply to the roadster as well. I'd be happy to share what I've learned if that would be of any value to you, just let me know.

RiCharlie · 10-27-2011, 10:17 AM

Quote:

Originally Posted by harry370z

By hatch do you mean boot?

Yes but only if by the boot you mean the hatch..

harry370z · 10-27-2011, 05:11 PM

Quote:

Originally Posted by RiCharlie

Yes but only if by the boot you mean the hatch..

ha ha , bloody americans! always getting things mixed up

Ive organised to have my doors done with dynamat extreme and the "hatch" area done with dynamat extreme then with Dynaliner on top.

Selected Dynaliner over Dynapad because it seemed pretty similar and it has a adhesive backing already on it.

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?

10-05-2011, 02:37 PM	#229 (permalink)
Guard Dad Enthusiast Member Join Date: Aug 2010 Location: South Orange County, CA Posts: 422 Drives: 2010 370Z Silver A7 Rep Power: 15	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	#233 (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: 31	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	#230 (permalink)
kenchan A True Z Fanatic Join Date: Aug 2009 Location: N/A Posts: 76,801 Drives: N/A Rep Power: 141521	^^ nice post, guarddad!

10-29-2011, 04:58 AM	#239 (permalink)
harry370z Base Member Join Date: Sep 2011 Location: Sydney Australia Posts: 67 Drives: Nissan 370z 2010 Rep Power: 14	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	#240 (permalink)
ImportConvert A True Z Fanatic Join Date: Jun 2010 Location: SWMO Posts: 4,454 Drives: 2019 CX5 GT Reserve Rep Power: 7627	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?