9 replies to this topic

[Rosssco]

Possibly considered a bizarre question for some, but does anyone have an idea on the area required to do the inside of the car with Dynamat? Possibly looking to cover the floor, behind the seats and behind the rear speaker panel, and possibly also the insides of the tub (although I like the bare chassis look). Its not cheap stuff (especially the better 'xtreme' stuff I'd use), and don't think I need an equivalent full car kit that you can get off eBay.. Ross

[fezzasus]

Keep in mind it's really heavy stuff, i'd suggest limiting the areas you apply it to and consider using something lighter in other areas. For example: Dynamat behind the seats to block out engine noise. Carpet on floor - lighter and will reduce high pitched sounds such as debris hitting the underside of the car. Foam down front wheel arches for same reason as carpet.

[Rosssco]

Keep in mind it's really heavy stuff, i'd suggest limiting the areas you apply it to and consider using something lighter in other areas. For example:

Dynamat behind the seats to block out engine noise.
Carpet on floor - lighter and will reduce high pitched sounds such as debris hitting the underside of the car.
Foam down front wheel arches for same reason as carpet.

Cheers Fezza. Hadn't thought of foam in the wheel arches.

I've still to find out the weight, but I've read that the 'xtreme' version is a good bit lighter than the traditional bitumen-based stuff, and not too bothered (and I probably wouldn't notice) if it adds 5-8kg total weight, as alot of it will be at floor level anyway.

Hadn't thought of foam in the wheel arches. Might try similar (if there's room) on the inside of the doors and under the dash.. (I've officially gone soft)

I'm trying to make the car a bit more 'livable' in general, and also a bit of winterisation, hence sound-deadening, one of you heater units, Lotus ABS unit etc.

[CocoPops]

Also, bear in mind man points. For every 100g of dynamat that you add, you lose 10 man points. So I'm not sure you're man enough to own your VX in that case Hand in the keys at the door.

[Rosssco]

Also, bear in mind man points.

For every 100g of dynamat that you add, you lose 10 man points.
So I'm not sure you're man enough to own your VX in that case

Hand in the keys at the door.

I know, I'm actually a woman, with large breasts... I just pretend to be male on the forum so people don't treat me differently..

[FLD]

Also, bear in mind man points.

For every 100g of dynamat that you add, you lose 10 man points.
So I'm not sure you're man enough to own your VX in that case

Hand in the keys at the door.

I know, I'm actually a woman, with large breasts...

I'm spent X(

[techieboy]

Remember, the sound deadening stuff that was stuck to the floors of the S1 Elise caused the aluminium to rot. Might be better to have something removable (like this) under the seats and mats.

[Firthy]

Good point - Techie but unfortunately I can answer that one as my car has dynamat on the floor behind the speakers etc... (previous owner) It doesn't cause any rotting... obviously if its put down when the floor is dry I have tried to peel mine up (impossible) and the floor is absolutely clean as a whistle underneath.... Does it make a blind bit of difference to the sound deadening...... absolutely sweet FA if you ask me!!

Edited by Firthy, 30 August 2012 - 10:08 PM.

[Arno]

Dynamat and other such 'heavy' materials are really meant to stop noise transmission because of panel vibrations/resonations. It cuts 'droning' from panelwork. You actually only usually need a few strips placed at strategic places to change the resonant frequency of a panel for it to reduce those noises by quite a margin.. It has little or no direct effect at attenuating/cutting air-transferred noise like direct noise from the engine bay and I always have to laugh at people who completely cover the inside of a car in the stuff as it would probably have had exactly the same effect if only 10% was used To cut down on 'free air' noise you have to resort to various types of foam panels which will filter certain frequencies that pass through them. Depending on the density and construction (open or closed cell) the foam types will have a different acoustic profile. Adding carpets cuts reflected noise in the cabin, just like a padded liner for a hardtop does and further helps to remove annoying frequencies. There are various noise reducing foam mats (often with a nice top layer with or without self adhesive layers) for use in cars on the market. Usually it's sold for 'under bonnet' or 'engine bay' use so it's reasonably heat resistant and can handle moisture and oil/dirt. Bye, Arno.

[fezzasus]

Remember, the sound deadening stuff that was stuck to the floors of the S1 Elise caused the aluminium to rot. Might be better to have something removable (like this) under the seats and mats.

Adding to ths, one common way people deal with the rotting is paint with POR15 (in silver) it looks pretty much the same as the aluminium tub but will protect the surface much more - if you are going to use dynomat, I'd paint the surface first.