Sound proofing experiment on the 370Z

Chuck33079 · 09-08-2015, 06:17 PM

Quote:

Originally Posted by 370bluez

This is good info. That product looks similar in nature to Frost King but thicker it would be a good layer on top of Dynamat. Btw does it smell?

Not smell at all. And their deadener is fairly cheap, so you might as well make it a full layer while you're in there.

The main culprit for the road noise is the tires, though. You can't get around that with foam and deadener.

370bluez · 09-08-2015, 06:33 PM

Quote:

Originally Posted by Chuck33079

Not smell at all. And their deadener is fairly cheap, so you might as well make it a full layer while you're in there.

The main culprit for the road noise is the tires, though. You can't get around that with foam and deadener.

Mine are at roughly 80% tread. While tires do make a lot of noise this car has amazingly little noise insulation. The entire trunk only has a few strips of 1/16" sound insulation. Usually there would be some kind of carpet or a wheel liner etc.

My original idea was to pull down the wheel liners and put dynamat there... then I ducked into the wheel wells and was shocked to find nothing there.

I have never had a car without wheel-well liners.

My car isn't very loud over good pavement but it is really bad over coarse pavement. I was hoping to cut that down a bit.

Dirk McGurck · 09-09-2015, 11:36 AM

Do you have any exhaust work?

370bluez · 09-09-2015, 12:36 PM

Quote:

Originally Posted by Dirk McGurck

Do you have any exhaust work?

100% stock.

mishuko · 09-09-2015, 03:04 PM

Quote:

Originally Posted by 370bluez

I did... I looked at at least 10 threads. Most don't have any measurements behind their claims. And from what I could tell most seem disappointed even after covering the entire trunk etc.

The proper way to apply material like dynamat isn't to cover every single space of metal but only a portion preferably in the middle of a panel i went a bit overboard since these cars don't even have wheel well liners?! WTF is up with that. Which explains the whole pebble issue.

Unless you're looking for mass damping through the sheer weight of the material. But that would require 2-3 layers of dynamat which would weigh 50lbs and is completely insane.

i agree with that statement about 2-3 full layers being insane but i did double up on the wheel well since there was no insulation as you have pointed out.

one of the things to remember is this is a pure-bred sports car. it's not a luxury sports coupe or anything close to a 'luxury' branded car so you won't be getting the same conveniences that come with the luxury badge.

i tried just the wheel wells and the spare wheel section, went back and did the entire trunk and noticed an improvement. also going from the stock tires to re-11's made a big improvement in road noise.

the road noise is fine minus hearining the pebble pings and long drives (more than a few hours). I did a few 4 hour drives before and after the install and it definitely helped relieve the road noise stress.

370bluez · 09-09-2015, 03:21 PM

Quote:

Originally Posted by mishuko

i agree with that statement about 2-3 full layers being insane but i did double up on the wheel well since there was no insulation as you have pointed out.

one of the things to remember is this is a pure-bred sports car. it's not a luxury sports coupe or anything close to a 'luxury' branded car so you won't be getting the same conveniences that come with the luxury badge.

i tried just the wheel wells and the spare wheel section, went back and did the entire trunk and noticed an improvement. also going from the stock tires to re-11's made a big improvement in road noise.

the road noise is fine minus hearining the pebble pings and long drives (more than a few hours). I did a few 4 hour drives before and after the install and it definitely helped relieve the road noise stress.

Some truth to this but I have the same options as a Infiniti g37. Nav, leather, Bose with sub, heated seats etc. Saving 10-15 lbs in a non light 3350lb coupe seems asinine considering how much it can ruin the experience. Even with my 4-5lb hackjob the car is far more enjoyable on longer freeway runs.

Sent from my XT1060 using Tapatalk

Dirk McGurck · 09-10-2015, 06:30 AM

The Infiniti G weighs like 400lbs more, though. And that's all sound proofing.

And the Z is a light coupe. Compared to most cars in its class it weighs a couple hundred pounds less.

370bluez · 09-10-2015, 10:54 AM

Quote:

Originally Posted by Dirk McGurck

The Infiniti G weighs like 400lbs more, though. And that's all sound proofing.

And the Z is a light coupe. Compared to most cars in its class it weighs a couple hundred pounds less.

It is over a foot longer and has a back seat... A Porsche boxster S is 350lb lighter. Anyways ...

There aren't many 2 seater sports cars around the z size other than the corvette which is roughly the same weight while packing 100+ hp

Dirk McGurck · 09-10-2015, 12:18 PM

But to be fair, our floorboards aren't made of balsa wood.

mishuko · 09-11-2015, 08:26 AM

Quote:

Originally Posted by Dirk McGurck

But to be fair, our floorboards aren't made of balsa wood.

i swear they are made of some sort of engineered metal to transfer the sound from the tires into your ear balls

370bluez · 09-11-2015, 09:24 PM

Put some dynamat in the wheel wells with FK on top and some frost king on the wheel liners. Really shitty pics... sorry about that. Will report DB findings later.

Chuck33079 · 09-11-2015, 10:07 PM

I've considered using some of the exterior spray on deadening in the rear wheel wells to really cut down the noise. That may be the ticket.

370bluez · 09-14-2015, 01:41 PM

Final update.

Approximately 3-4 DB decrease from stock. The car is now decent in terms of road noise and you can easily hold a conversation with a passenger without feeling like you're in a club.

Total weight add was around 4-5lbs. Totally WORTH it mod in my mind.

No this car is not a VAULT as some like to describe these experiences. But it is certainly more livable and no longer a nuisance.

TexasChuck · 09-14-2015, 02:12 PM

BlueZ, What is the name of that CCF FrostKing? I haven't been able to find it.
Thanks
I like the sound deadening spray idea. If we could just get a even application.

370bluez · 09-14-2015, 02:43 PM

Quote:

Originally Posted by TexasChuck

BlueZ, What is the name of that CCF FrostKing? I haven't been able to find it.
Thanks
I like the sound deadening spray idea. If we could just get a even application.

I would recommend going the same route as me and adding Dynamat around the wheel wheels since it adds an initial layer of mass damping. Even with those two layers in place there is still room for improvement in that area. There is a TON of noise coming from there from the factory.

Frost king Fv516

Shop Frost King 15-ft Roll Insulation at Lowes.com

09-09-2015, 11:36 AM	#18 (permalink)
Dirk McGurck Track Member Join Date: Jun 2014 Location: Delaware Posts: 715 Drives: 09 MB 370Z Touring Rep Power: 21	Do you have any exhaust work? __________________ 2009 370Z Touring with Sport

09-10-2015, 06:30 AM	#22 (permalink)
Dirk McGurck Track Member Join Date: Jun 2014 Location: Delaware Posts: 715 Drives: 09 MB 370Z Touring Rep Power: 21	The Infiniti G weighs like 400lbs more, though. And that's all sound proofing. And the Z is a light coupe. Compared to most cars in its class it weighs a couple hundred pounds less. __________________ 2009 370Z Touring with Sport

09-10-2015, 12:18 PM	#24 (permalink)
Dirk McGurck Track Member Join Date: Jun 2014 Location: Delaware Posts: 715 Drives: 09 MB 370Z Touring Rep Power: 21	But to be fair, our floorboards aren't made of balsa wood. __________________ 2009 370Z Touring with Sport

09-11-2015, 09:24 PM	#26 (permalink)
370bluez Base Member Join Date: Apr 2015 Location: Kali Posts: 54 Drives: 12 370z Rep Power: 10	Put some dynamat in the wheel wells with FK on top and some frost king on the wheel liners. Really shitty pics... sorry about that. Will report DB findings later. Dirk McGurck likes this.

09-11-2015, 10:07 PM	#27 (permalink)
Chuck33079 A True Z Fanatic Join Date: Nov 2011 Location: Houston Posts: 12,265 Drives: 2011 370ztt Rep Power: 29539	I've considered using some of the exterior spray on deadening in the rear wheel wells to really cut down the noise. That may be the ticket. TexasChuck likes this. __________________ 2011 MB Touring-Sport-6sp-Nav/GTM TT/FI TT TDX/JTran/Kosmic/Eibach/Hotchkis/SPC/CSF/RPS/SoThatsWhereAllMyMoneyWent

09-14-2015, 01:41 PM	#28 (permalink)
370bluez Base Member Join Date: Apr 2015 Location: Kali Posts: 54 Drives: 12 370z Rep Power: 10	Final update. Approximately 3-4 DB decrease from stock. The car is now decent in terms of road noise and you can easily hold a conversation with a passenger without feeling like you're in a club. Total weight add was around 4-5lbs. Totally WORTH it mod in my mind. No this car is not a VAULT as some like to describe these experiences. But it is certainly more livable and no longer a nuisance.

09-14-2015, 02:12 PM	#29 (permalink)
TexasChuck Track Member Join Date: Oct 2012 Location: SE Texas Posts: 556 Drives: 2014 Black Cherry Co Rep Power: 14	FrostKing? BlueZ, What is the name of that CCF FrostKing? I haven't been able to find it. Thanks I like the sound deadening spray idea. If we could just get a even application. Last edited by TexasChuck; 09-14-2015 at 02:14 PM. Reason: New Thought?

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