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ibexman

Member Since: 13 Dec 2008
Location: kent
Posts: 2876

Td5 and Dynamat

Has anyone actually performed any before and after noise level tests with Dynamat On decibel meter

15th Dec 2013 4:42pm

Likeomg

Member Since: 29 Jun 2012
Location: Lake District / Newcastle
Posts: 2626

2010 Defender 90 Puma 2.4 HT Stornoway Grey

i have a decibel meter and a dynamated 2.4, i could try it against some other cars maybe? never thought to get a reading of mine before i did it

15th Dec 2013 5:15pm

TR51

Member Since: 17 Apr 2012
Location: Dorset UK
Posts: 333

2014 Defender 110 Puma 2.2 SW Corris Grey

I used silentcoat on mine (same principal as dynamat and almost identical construction). The description of where I applied it etc are on my TR51 thread ( http://www.defender2.net/forum/topic12967-15.html ).

Results:
Engine on, stationary Reduction : 8db
30mph in 3rd Reduction : 14db
50mph in 5th Reduction : 9db
70mph in 5th Reduction : 5db

I didn't do the engine bay, roof or wheel arches so if these rant exposed better results may be forthcoming

Hope it helps.

15th Dec 2013 6:28pm

mk1collector

Member Since: 17 Sep 2009
Location: West Yorkshire
Posts: 6769

Dynamat alone will not make it a lot quieter. Dynamat is to stop vibrations, so drumming noises like from the big flat roof should be deadened. If you want noise reduction I suggest dynamat then a decent thickness of closed cell foam over the top and it makes a big difference, but the whole interior needs doing (and I mean everywhere) to make the biggest difference.

15th Dec 2013 6:41pm

Sphere

Member Since: 26 Apr 2013
Location: Midlands
Posts: 725

2015 Defender 110 Puma 2.2 USW Keswick Green

When I did the front dynamated then added the wright off road kit dropped nearly 10db if I remember correctly was very crude iPhone app mind.

15th Dec 2013 6:58pm

Killer90
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Member Since: 09 Oct 2011
Location: Hertfordshire
Posts: 6478

2016 Defender 110 Puma 2.2 XS DCPU Fuji White

I am going to next year all organised ready to do a proper test

Got a TD5 in at the minute chris for full soundproofing

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15th Dec 2013 8:23pm

ibexman

Member Since: 13 Dec 2008
Location: kent
Posts: 2876

Sounds good will wait to see results

15th Dec 2013 8:38pm

pj2106

Member Since: 20 Dec 2012
Location: Huntingdon AKA The Shire
Posts: 1500

2008 Defender 110 Puma 2.4 USW Stornoway Grey

we did a test on a td5 at work before and after and the results was quite good 11db reduction

that was using Skinz soundproofing from Four 2008 110 2.4 XS Utility (Hagrid)
2002 90 TD5 Hardtop (Sully) Sold
1998 300TDi D1 (Billy) Sold

15th Dec 2013 9:36pm

Ken B

Member Since: 17 Dec 2013
Location: Essex
Posts: 106

Killer90 wrote:
I am going to next year all organised ready to do a proper test Got a TD5 in at the minute chris for full soundproofing

roughly what does it cost to do a full TD5 90 ? Defender 90 TD5 County -
You need only two tools in life: WD-40 and duct tape.
If it doesnt move and it should: WD-40.
If it moves and shouldnt: duct tape it.

18th Dec 2013 4:50pm

johnszs

Member Since: 16 Aug 2010
Location: Hereford
Posts: 459

2004 Defender 90 Td5 XS CSW Alveston Red

pj2106 wrote:
we did a test on a td5 at work before and after and the results was quite good 11db reduction

that was using Skinz soundproofing from Four

That's impressive, I hope mine will be close to that then when I get around to taking out the interior and starting again. I will do a before and after test for people.

Has anyone used the dynamat tape to seal the joints up? 2004 TD5 Defender 90 xs station wagon

18th Dec 2013 8:03pm

Macpaul

Member Since: 26 Mar 2013
Location: SW Surrey
Posts: 439

2013 Defender 110 Puma 2.2 USW Loire Blue

mk1collector wrote:
Dynamat alone will not make it a lot quieter. Dynamat is to stop vibrations, so drumming noises like from the big flat roof should be deadened. If you want noise reduction I suggest dynamat then a decent thickness of closed cell foam over the top and it makes a big difference, but the whole interior needs doing (and I mean everywhere) to make the biggest difference.

Not sure I agree. I've Noisekillered some of it and Dynamatted other bits over a period of time and driving before and after fitting Dynamat definitely made a difference to the level of noise. 2003 Td5 110 Hardtop
Now a 2013 110 USW too.

18th Dec 2013 8:36pm

Diablo

Member Since: 26 Oct 2011
Location: Basingstoke
Posts: 335

1984 Defender 90 200 Tdi SW Keswick Green

That will be due to the reduction in drumming noise, as well as a slight barrier to other noise.

But it isn't a noise barrier in itself. Other than the fact it is something else to travel through.

You need an anti-drumming layer (eg dynamat, silentcoat), followed by a thin layer of closed cell foam, followed by mass loaded vinyl - this is very dense and is a proper sound barrier

Last edited by Diablo on 19th Dec 2013 2:01pm. Edited 1 time in total

18th Dec 2013 10:10pm

Macpaul

Member Since: 26 Mar 2013
Location: SW Surrey
Posts: 439

Well I don't know the technicalities.

Just Dynamat less noise makes. 2003 Td5 110 Hardtop
Now a 2013 110 USW too.

18th Dec 2013 11:11pm

Sphere

Member Since: 26 Apr 2013
Location: Midlands
Posts: 725

18th Dec 2013 11:12pm

mk1collector

Member Since: 17 Sep 2009
Location: West Yorkshire
Posts: 6769

Macpaul wrote:
mk1collector wrote:
Dynamat alone will not make it a lot quieter. Dynamat is to stop vibrations, so drumming noises like from the big flat roof should be deadened. If you want noise reduction I suggest dynamat then a decent thickness of closed cell foam over the top and it makes a big difference, but the whole interior needs doing (and I mean everywhere) to make the biggest difference.

Not sure I agree. I've Noisekillered some of it and Dynamatted other bits over a period of time and driving before and after fitting Dynamat definitely made a difference to the level of noise.

As Diablo says you need a layered approach to stop different kinds and frequencys of noise for the best effect. Basically dynamat stops the car making its own noise (vibrations/drumming) with a slight reduction from other noise due to extra mass but is not in itself a noise barrier, so external noise will still be heard. Without going over the top and not being able to refit trim etc, a coat of dynamat (or similar) and say 6 to 10 mm thick closed cell foam (so it doesn't absorb water) is the best and most cost effective way to make a big difference in noise and as a bonus cuts down on condensation during winter months

19th Dec 2013 11:01am

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