Sound deadening

goatboy wrote: Would it be worth will taking off the covers over the arches and just filling them with rags or loft insulation or something cheap to see if it makes any difference?

Good idea, I might see whats lying around the parents place to shove in there to see if thats the main culprit.

I'm not gonna try and cut the sound out completely, but it almost sounds like theres a hole in the back the metal must be that thin, so I kinda want to reduce that, anything is an improvement.

The lead flashing seems like it has the same effect as the CLD tiles, but cheaper. I might get a bit of it, or something similar, but its outright noise I want to try and get rid of rather than panels resonating.

Vaxxi, looks like you have spent alot on your install, as much as I would love to be able to afford all that, I cant. How much has it cost if you dont mind me asking? Must feel like a $50000 car with how solid everything sounds!

VAXXi wrote: Bituminous material for the arches and side panels:

That's what I want to do as this is where I think most of the noise would be coming from! Just on a cheaper scale and with some MLV (Mass loaded vinyl) or similar, hence the carpet underlay and paint on body deadener. But now talking about it I might skip the paint and go either the lead flashing or the Jaycar deadener

Actually, no - that's why I mentioned the StP Youtube tutorials, I learned a bit from them.

The bitumen material is there to keep the thin sheet metal from vibrating, as it's quite heavy (about 1-1,5 kg per A4 sized sheet) - makes your music sound better. If you want to insulate noise from the engine/transmission/outsite, you want the rubbery sponge stuff, as thick as possible of course. Looking at stp-distribution.com/products.html will give you an idea about the materials you want to look.

I did not spent so much as you'd think; all materials for the above were under 150-200 EUR if I remember correctly. Even now it doesn't sound at all like a 50k$ car (as the Jim is quite close to an agricultural machine ), but it's a big improvement - especially on long trips.

Looking back, if you want just sound insulation: do the boot floor (as it's just a thin sheet of metal separating the inside from the transmission and road) and the front floor (again, transmission and road) with thick carpeting similar to what you can see above and see after that. In my opinion, stick away from liquid materials; they usually stink, cannot be applied properly when it's cold/wet and don't really see how you can take them off if desired (with the sticky stuff, you can use a heat gun and patience at least).

i dunno where in aus you are but go to Clark Rubber, they sell the perfect stuff you need for sound deadening they have a few sizes and types one that is just the spongy rubber soundeadener, and another that is the same but with heat shield (aluminium foil) i put 15mm in mine with the foil about $35 a meter or about 30 for same size without, you need about 2.5M for entire car, its not that easally compressed but you can go the 10mm and it will be better then the larger one that i got as it pushes your carpet up and misshapes it a bit but i dont notice it,

I have pictures of how i did it as well but i cant post them till tomorow.

i also used bitumen sound deadener on the wheel arches,

bitumen stops thesound actually transfering through the panel (Vibrations) the spongy stuff absorbes the sound waves. as there is alot of space the pressure waves gets lost in it so to speak.

i would advis against glueing the sponge down as it could possible hold water and rust your floor.

I also used a Rubber spray on sound deadenner and rust protectant, mostly for rust protection but it also has deadening properties,

if your on the cheap i sugest you get a paint on one, supercheap sells 4L for about $40-50and that would get you at least 2 coats, helping with sound heat and rust.

ill get you my pics of my jimny wheni can get to them.

mines alittle over the top but i cant hear any road noise besies through the windows.(pretty hard to stop that).

Here is the pictures of what i did, i sprayed the floor with a rubberised coating (from SuperCheap), dryes hard. Its a 3M product i think it was called Car Guard





but if your doing it cheap id sugest this Body Deadener


I used a 15mm rubber sponge with foil (from Clark Rubber) doesnt exactly matter what way around it goes but if you get the foil one go foil down as it makes the carpet slipery

Clark Rubber




then i did the doors and rear quaters in bitumen sound deadener sheets, yes i use the most expensive pretty much of dynamat, but i had 2 boxes that have been lieing around for a year or 2.

These'll do for me.




:laugh:

Seriously though, some good tips here!