Soundproofing

[geoff_s14]

I want to fit some soundproofing....I SAID I WANT TO FIT SOME SOUNDPROOFING!!....What products have people used in the past, and which are the mnost crucial areas to cover, espec. in the s14.

[Nathan_200sx]

I used some sound deadening felt brought from the local kevmobile store. You can also get some panel spray for any large areas of metal, like inside doors etc. I just fitted it under my carpet in the boot and under the parcel shelf which made a big difference. made driving with the mongoose on a bit quiter.

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Nathan
Red S13 Mongoose, K&N T3 280ish BHP http://mysmilies.com/smilies/cwm30.gif
Empty bank account

[This message has been edited by Nathan_200sx (edited 12-06-2001).]

[JB]

I did some soundproofing in mine after the first time I drove it in the rain and it sounded like a monsoon.

I used sound deadening material bought from my local motorist shop.

The areas to go for are in and around the boot, rear seat back, parcel shelf and rear wheel arches.

The boot is really simple, just pull up the carpet and fit it underneath (don't forget to do the spare wheel hole as well).

The material on the back of the rear seat just comes off to allow you to put some soundproofing behind it.

To do the rear wheel arches you have to take out the back seat, unbolt all that lovely black plastic and fit it behind it. It helps if you have a service manual.

The end result is quite good, especially in the wet and the amount of weight added to the car is neither here nor there. However, it'll never be as quiet as a limo.

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JB
'00 Emerald S14 auto
http://cwm.ragesofsanity.com/otn/mfinger/thefinger_red.gif to XR2s, 3s, lowered Saxo VTRs,
crapped out Cavaliers and ALL BMWs

[geoff_s14]

Nathan,

Did you actually glue it to the panels, or just lay it under the existing carpet/parcel shelf. I ask cause some of the products I've seen advertised only work if they are actually fixed firmly to the panels to ensure efficient transfer of vibrational energy.

[geoff_s14]

JB,

Did you do the whole of the rear inner panels, or just over the actual wheelarch itself. I've been behind those rear trim panels myself in the past (fixing leaky rear quarter windows), but seem to remember access being quite difficult, especially on the nearside due to boxes of electronics (ABS system?).

[JB]

Geoff

Mainly over the rear arches but I managed to glue a bit elsewhere where possible.

You've gotta glue the stuff or you don't get a good result (and it looks a mess).

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JB
'00 Emerald S14 auto
http://cwm.ragesofsanity.com/otn/mfinger/thefinger_red.gif to XR2s, 3s, lowered Saxo VTRs,
crapped out Cavaliers and ALL BMWs

[Nathan_200sx]

The only place I glued it was under the parcel shelf. all the rest was just laid underneath the the carpet like the origonal stuff. I've just rememberd something else we used to use on vans, it's about 30cm square and one side is sticky/very very sticky and about 3mm thick, this was very good stuff. but I cannot remember the name of it.
To get the best results you realy should have whatever you use attached firmley. what Im doing is just muffeling the sound thats coming through, by sticking your material to the surface you make it denser and more efficient at absorbing the energy. the more material used and the more denser it is will reduce the SPL of the sound waves comming into the car thus making a quieter drive. another freaky way of "stopping sound" I've read about although not practical in a car is to have some dense board and drill holes in it, the size and spacing of the holes depends on the frequency that your tryng to block, apparently it works like the shield in a microwave whereby the size and spacing of the holes inhibit the wave's progress through the material. totaly useless info I know but might come up in a pub quiz or something http://300zx.co.uk/200sx/ubb/biggrin.gif

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Nathan
Red S13 Mongoose, K&N T3 280ish BHP http://mysmilies.com/smilies/cwm30.gif
Empty bank account

[geoff_s14]

Nathan,

Another good related pub quiz answer to a question which hasn't been asked yet is the work Lotus did a few years back investigating the use of antinoise - where they used microphones to sample certain fixed frequency sound waves, eg from tyre noise etc, then synthesised the same frequencies but 180 degrees out of phase in order to cancel the source wave.

[Nathan_200sx]

Didnt realise Lotus had done that, I had heard of the process though. I was thinking about building one myself to cancel out nagging. I suppose they never carried it through though, the last I heard on the research the only way they could get it to work was with constant frequncy and db. getting variable out of phase frequencies to the ear the same time as the source sample was proving dificult, just resulting in twice as much noise realy. Shame realy it would be realy cool a parties, the looks on peoples face would be a picture.

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Nathan
Red S13 Mongoose, K&N T3 280ish BHP http://mysmilies.com/smilies/cwm30.gif
Empty bank account

[geoff_s14]

Nathan,

Yeah you're right, it only works on constant frequencies and repeating patterns of waveforms, so would be perfect for antinagging applications around the home. I was thinking about developing a number of context-based domestic units myself. There could be anti 'get off your arse and help me with the washing up' waveforms for the kitchen, anti 'these shirts don't iron themselves' for the laundry room, and anti 'you care more about that car than you do about me' for the garage....

[Nathan_200sx]

LOL Im not on my own then http://300zx.co.uk/200sx/ubb/wink.gif fellow sufferer.

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Nathan
Red S13 Mongoose, K&N T3 280ish BHP http://mysmilies.com/smilies/cwm30.gif
Empty bank account

[geoff_s14]

Nathan,

You, me, and 50% of the Rest Of The World. Maybe we should set up a victim support group on the web.

[JB]

This is a victim support group isn't it? http://cwm.ragesofsanity.com/otn/wink/smily012.gif

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JB
'00 Emerald S14 auto
http://cwm.ragesofsanity.com/otn/mfinger/thefinger_red.gif to XR2s, 3s, lowered Saxo VTRs,
crapped out Cavaliers and ALL BMWs

[Chimp]

When things get a bit dodgy, i have been known to put my motorbike helmet on in the house. Thus rendering all "you spend too much time with your car/bike/mates" talk ineffective.

[geoff_s14]

Chimp,

I do that too. If like me you've got a black visor, it has the added advantage of preventing you from seeing your verbal assailant.

[DJFish]

Geoff,
I fitted soundproofing to my Almera and it's dead easy and very effective.

I used 'Brown Bread' (£15 each) which is a roll of sticky asphalt type stuff with a foil layer, most car radio places stock it.

In the Almera, the noise seemed to be coming from the wafer thin doors and footwell, so I took off the door panels, cleaned the inside of the door skin with some de-greaser, then put the stuff on.
It's really easy to apply, just cut it into small (20cm squares) for ease of handling and press it against the inside of the panel, as long as it's clean it'll stick really easily. I bought a can of spray grease from Halfords and squirted round the corners and welds once I'd finished to stop rust and also gave the window mechanism a good coating as well.
I just lifted the carpets in the footwell and stuck small squares all over the place and as far up under the dash as I could, in the end I used one tube for each door and one for each footwell.

At motorway speeds most of the road noise and vibrations are gone and I can actually hear wind noise rather than just the engine, it seems like it's mostly high frequency sound that gets affected.

A good tip if you are going to do it is to get one of those little wallpaper rollers to make sure you get good adhesion, and double up on the soundproofing in the middle of really big (door) panels.

Good luck
Dave

[Daniel san]

I think you boys need to get some "Dynamat" from any car audio dealer.



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Dan
www.puresx.co.uk
Do not take offence to anything I might say, I am completely mad. So jus chill de feck oooot, ok!

[DJFish]

I believe Dynamat is the same sort of stuff as Brown Bread but a wee bit more pricey, I did hear that it's a bit harder to apply and might need heating with a hair dryer to bond properly.

Worth doing whatever you use.

Cheers
Dave

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http://cwm.ragesofsanity.com/otn/animals/fish.gif

Black Almera GTi/Blue S14

[geoff_s14]

RE dynamat:

I've just read a review article on the web which compares all the popular sound proofing products, and it seems brown bread is the better than any of the dynamat products, for both price and noise insulation, so I guess I'll be going for some of this.

Cheers to everyone for your responses.

[MarkJord]

I took JB's advice and removed the rear seat and rear side panels. I glued some stuff in which I got from the local accessory shop.
It made some difference but I probably need to add some to the boot and back seat.

Be careful removing the back panels - it's aesy to break the clips and not so easy to obtain new ones!

[Nathan_200sx]

What about this way http://300zx.co.uk/200sx/ubb/biggrin.gif http://300zx.co.uk/200sx/ubb/biggrin.gif http://300zx.co.uk/200sx/ubb/biggrin.gif http://300zx.co.uk/200sx/ubb/biggrin.gif

http://www.screwfix.com/PICTURES/5780.jpg

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Nathan
Red S13 Mongoose, K&N T3 280ish BHP http://mysmilies.com/smilies/cwm30.gif
Empty bank account

[Chimp]

GRAK GRAK http://300zx.co.uk/200sx/ubb/biggrin.gif

i was looking for the same pic!!!

[Nathan_200sx]

Great (or crazed) minds think alike http://300zx.co.uk/200sx/ubb/biggrin.gif


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Nathan
Red S13 Mongoose, K&N T3 280ish BHP http://mysmilies.com/smilies/cwm30.gif
Empty bank account

[Bean]

After upgrading the stereo and speakers I fitted some Dynomat to the rear parcel shelf and front doors on my car.

Basically it's rubbish, makes only a slight difference and isn't cheap. You can different grades for better sound damping but it's not cheap.

My car still resonates like a b*****d!!!

I might look into getting some of this brown bread stuff?

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Red 1995/S14
K&N

[Chimp]

ten points to whoever goes out and sticks a hovis or a warbutons to their interior.