Sound proofing

Evening Guys,
I've got a defender 90 with a 200 tdi from a disco in it, its had an absolute fortune spent on it when it was rebuilt but lacks in the sound proof area, when I fire it up in a morning it rattles quite a bit and resonates. If I increase the engine revs ever so slightly it stops the worst of the vibration, could it be that the tick over needs adjusting??? Also I was going to add some of the adhesive sound proofing to everywhere I could get it. I went to the landy show at the weekend and when it was all loaded up with camping gear etc and the extra weight it was a lot better. has any body else had this problem or has anyone got any thoughts/ideas on improving it????
thanks in advance EwdMucker

i planned to use some waterproof foam round transmission tunnel in my conversion

Where do you get that from mate.

seen it at shows, but didn't have room for it 8x4 sheet was £12-18 depending on thickness.

or ebay

unless anyone has better idea

fanatic said:

seen it at shows, but didn't have room for it 8x4 sheet was £12-18 depending on thickness.

or ebay

unless anyone has better idea

Click to expand...

EVA Stable Mats - Quality Horse Mats from HorseMats Plus

I have a 200tdi from a disco also, I had the rattling problem at idle too and had that adjusted which solved the problem. I have absolutely soundproofed the **** out of my 90 . First was the foot wells and under the seats and round the gearbox tunnel underneath the cover. Did that with some sound proofing foam (closed cell) about 5 mil thick. Made a good difference. Next I soundproofed the bonnet (a little disappointed with those results). I then purchased to big lots of auto sound proof layered carpet. Made some headlining for the back of the 90 with it, covered the wheel arches, seat box and over the foam in the foot wells. I did not put carpet on the floor due to water from wading or leaks (which I seem to have stopped!) Put some foam in the back door. Covered front floor in dynamat equivalent which is waterproof. Put some heat reflective foam on upper bulkhead in the engine bay. Have rubber mats in floor with hard mats on top. Any more and would annoy feet/peddles . After all that there is virtually no road / gearbox noise whatsoever. Only the great rumble of the engine. the only way I can think of reducing that is to take the dash off and layer the bulkhead with foam but that's a bit of a task. All that's left to do is soundproof the front doors but waiting to reskin them first. Hope this helps Its worth the effort and didn't cost much at all really.

Thanks very much D90mitch I'm going to go to town on mine over the next few weeks. Get some stuff off eBay and get cracking before I go deaf or rattle my teeth out.

cheap camping mats work well aparently (on the look out for em at car boots atm to do mine at the mo)

Thanks for all the tips in this thread, gents. I'm going to do some soundproofing in mine too, so all this is very useful indeed.

IN my opinion the best thing was doing under the seats, gearbox tunnel and footwells. with 2 layers of stuff. Just a shame the 90 is so quiet apart from the engine damn you dashboard!

Tesco's sell foil covered closed cell camping matts for a couple of quid. Ive used those, you can double up in places as they're quite thin or put high density rubber underneith in the key areas. They dont rot too quickly either.

Key to sound proofing is to use two different density materials to cut out high and low frequencies.

am I the only one that enjoys all the noise?

Well I am about to do a straight through so I do like noise of some sort

I am starting to do some sound deadening i got some sides from Ebay that Almost fit:



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I have made a large sheet of heavy matting for my seat box its Leatherette/pvc material backed with 6mm heavy underlay rubber mat then 2 layers of closed cell foam (camping mat I will remove my seats and lay this down and cut slits all I can say is its really really heavy and waterproof as its been outside for a year already.

I might put some pics up if i get time and if it stops raining

Did you do anything behind the carpet trim panel there Jai?

I've recently finished off the rear sides on mine and used a roll or two of Wickes roof flashing to add some weight and deadening to the ally panel itself, then put carpet over the top and finished off with a set of SW rear trims:



I had just carpet trims in like yourself before which I made a few years ago which did a good job, though the addition of the flashing I think has taken a bit of drumming away. Though with these things its all pretty subjective.

See here for details of flashing: Trimming Out a Defender 90 Hard Top - Land Rover Technical Blog

Retroanaconda said:

Did you do anything behind the carpet trim panel there Jai?

I've recently finished off the rear sides on mine and used a roll or two of Wickes roof flashing to add some weight and deadening to the ally panel itself, then put carpet over the top and finished off with a set of SW rear trims:

I had just carpet trims in like yourself before which I made a few years ago which did a good job, though the addition of the flashing I think has taken a bit of drumming away. Though with these things its all pretty subjective.

See here for details of flashing: Trimming Out a Defender 90 Hard Top - Land Rover Technical Blog

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Nothing substantial I used some 3M underseal all over the inside of the Hard top side as I got a serious ammount of underseal for not alot of money. I will use camping mat to glue to that but depends if I can get some more thick rubber HD underlay if so I will use that first then camping mat if not I may visit wickes and get some thick sound deadening material its about 30 a roll but one roll will do both sides easily. Tomorrow I'm hoping to pull out the front seats and carry on. I have already put in riv nuts for the seats so should be easy ish.

does doing all this make a massive difference? im looking to do all mine when i put it back to a hardtop?

I found applying this to the Aluminium

...and then

this on top

...before

finishing it off with this