Octavia Wagon sound deadening

[brad]

Stick some on the quarter panels - well worth it.

[KOOLIE]

Hi Mate.
The problem with road noise is common on all mk5-6 Golfchassis with multi link rear suspension. It's mainly down to a lot of design toe in geometry to give neutral handling but causes tyre scrub. The late golf 6 and TT have alloy wishbones and hubs which really helps and i'm currently converting my 2006 combi to these and adapting system for less toe. I know this is an old thread but i'll post info on asap if you still have your car. The Golfs are not much better regards road noise.

[timbo2loose]

I know this is an old thread, but I did this on the weekend Dynamat Extreme the boot, wheel well and arches. Is quite a bit quieter, rear doors are next.

[k_rider]

timbo2loose, I'm keen to do this with my wagon.

Any tips and tricks, especially with removing trim? How many sheets of Dynamat did you use to line the back end (I see that Dynamat Extreme is sold in 18" x 32" sheets)? Any recommendations on where to buy the stuff?

Let us know how you get on with doing your doors!

[timbo2loose]

I tried to buy Dynamat from my local Autobarn as they were meant to be a stockist but they could not even be bothered ordering it in for me, so Ebay from the US is your friend mine can with a free roller. Trim comes off fairly easily, the screw that is hidden by the rear seat can be accessed by giving the bolster a tug forward at about half way up. A cordless drill with a set of torx bits are your friend. I used 7 sheets for dynamat.

Ebay Dynamat Extreme: Here

[Transporter]

I tried to buy Dynamat from my local Autobarn as they were meant to be a stockist but they could not even be bothered ordering it in for me, so Ebay from the US is your friend

Yeah, expect to get even less products on offer from the shops when they realize which goods doesn't sell anymore because of the ebay. At the same time people will have to learn to be patient,.... while waiting .... and waiting, sometimes 2-3 weeks or longer.

[brad]

Yeah, expect to get even less products on offer from the shops when they realize which goods doesn't sell anymore because of the ebay. At the same time people will have to learn to be patient,.... while waiting .... and waiting, sometimes 2-3 weeks or longer.

You can't even attempt to sell something if you don't stock it or don't have reasonably quick access to stock (or aren't willing to order something in).

A place like Autobarn would have a central warehouse to keep stock of slow moving items. Something like Dynamat is great to keep on inventory as it isn't vehicle specific.

I've noticed quite a few Aussie sellers stepping up to the plate & reducing their margins. It's nice to be able to buy something locally & not feel bent over.

OTOH, I wanted a couple of splodger tools the other day. $1each posted from HK or $7 posted from AU. Same item, same quality. Warranty? Don't need it. 2 weeks posted from HK, 3 days from BNE.

[k_rider]

Thanks timbo2loose! I found that Ryda here in Sydney carry (or at least, list it on their website!) a lot of Dynamat products. Including the roller, Ryda is about $10 more for the 9 sheet bulk pack, plus another $20 on top of that for delivery (or I could pick it up of course, which would cost me at least $20 plus an hour or two of my time). There's an Autobarn close to me, I'll give them a shot first, they may just be more responsive than your local branch!

Time to roll up the sleeves, grit my teeth and give it a go...

[brad]

If you search ebay as "sound mat" there are plenty of AU based sellers of dynamat & similar products.

[Martin]

This thread gave me inspiration, bought some Dynamat Extreme off eBay, spent all afternoon installing it

First drive around the block is VERY promising, the front (engine) sounds more noisy
I interpret that as a lack of obvious noise from the rear - rather unlike the Octavia wagon - happy!



I think I'll do under the rear seats and side swabs covering the wheel arch - very little insulation there

Would like to put some Dynamat up front but that's a little more challenging

[brad]

For those of you not inclined to DIY, a mate recently had his BMW M3 inner & outer door skins done in Sound Deadener by Marty at FHRX Studios at Caringbah. It seemed pretty reasonable for $540 including some minor sound tweaks to the door speakers.

[bluey]

I'm using two Wurth products. See page 635
Company Catalogue June 2013

The foil backed bitumen is similar to what car makers use to take the drum out of metal panels. Used to use the Jaycar foil backed bitumen until I discovered the Wurth product. The foil backed bitumen is an example of "constrained layer damping", which is meant to be far more effective than just the mass of the bitumen layer on the panel. The Wurth foil-backed bitumen has an additional layer of fabric bonded to the back of the foil, which could be to absorb reflections of provide non-slip surface or both.

I'm guessing that the foam product would be suitable for under the carpet. Yeti has really squishy front carpets, so presuming there is something similar under the carpet. Going to see if I can make the Polo as quiet as the Yeti..... when I have a bit more spare time to gut the interior.

[Martin]

For those of you not inclined to DIY, a mate recently had his BMW M3 inner & outer door skins done in Sound Deadener by Marty at FHRX Studios at Caringbah. It seemed pretty reasonable for $540 including some minor sound tweaks to the door speakers.

Given the amount of time I've spent doing this (two long/full afternoons - have not done the doors) that's really good value for money

This has cut down about 75% of the road noise from the rear cargo bay and also knocked out most of the rear exhaust noise
The result is so good I'm pretty sure I will have to do the front wheel arches in the footwell

Today I've done under the rear seats and over the forward side of the rear wheel arch now (under the rear seat side panels)
Not sure if this will give has much benefit as doing the boot but I'll find out during the daily grind this week

[MountainBikeMike]

I've used the Solavis Supersheild, which is the exact same stuff as Dynamat, for my Crewman in the past. Works well. About to do my Octy with it, and iots heaps cheaper than Dynamat. Good thing about it is if you want to reduce the amount you buy and hence reduce the cost (OR save a heap for your next FEW cars), is that you can place it around your cars panels in little patches. What this acheives is reducing the vibration in each panel and the area around it. I just did the front doors in about 6-7 little patches.

There are many videos on Youtube showing how it works. Basically the asphalt glues itself to the panel and soaks up any microvibrations. They hold a 6-7inch square piece of alloy in the air on fishing line, and hit it like a music triangle instrument, with and without a 2inch patch. The difference is light and day. Without it you can hear the vibration for 2-4 seconds, with it, nudda. Maybe half a second if that. More of a thud..

So the main point is that this stuff makes good contact (hence using a roller), not just laying stuff over. And of course if you do big panels as others above have it works a lot better than what I have done, better at blocking sound flying through but the panel vibration reduction effect starts getting more limited.

Hope that experience is helpful

[BottomScratcher]

......What this acheives is reducing the vibration in each panel and the area around it. I just did the front doors in about 6-7 little patches.

There are many videos on Youtube showing how it works. Basically the asphalt glues itself to the panel and soaks up any microvibrations. They hold a 6-7inch square piece of alloy in the air on fishing line, and hit it like a music triangle instrument, with and without a 2inch patch. The difference is light and day. Without it you can hear the vibration for 2-4 seconds, with it, nudda. Maybe half a second if that. More of a thud.......

I was talking to another member about this the other day, and said I had seen a link somewhere. It was in this thread, but it's a dud link now. Have a look here. When one thinks about the physics of why the strings of musical instruments do what they do, and how the sound is amplified through air spaces in accoustic instruments the removal of resonance from large metal panels to make cars quieter makes sense.