Hi all. Another big job breaking out with me and the Mrs due to corona virus boredom .

 

We are in the middle of soundproofing the car. We have completed stripped out the boot area in preparation as this seems the area that would mostly benefit.  Just now looking at purchasing sound deadening and then adding closed cell foam. 

 

Can anyone share any tips or tricks? Suitable thickness of foam? How much actual sound deadening material to add? I read so many conflicting ways to do the job effectively without going overboard. I'm mainly trying to eliminate in cabin noise , but some audio benefits would be a bonus. 

 

Cheers all

JP 

I would have thought that the area up behind/above the pedals (both sides), inside of firewall would give most benefit, as most of the noise will be originating in the engine bay unless your exhaust is dodgy?

I think there may be more soundproofing in this area on 9N Polo than there is on 6Y Fabia, so there might even be some OE bits you can get and retrofit if you compare the relevant pages of ETKA.

in the process of doing this on my ibiza 6L 2004 sport. it has already got a sound deadening sheet in both drivers and passengers foot well and thick underlay that may or may not be decent soundproofing. unsure if the fabias will have the same?

 

covering rear wheel arches apperently help, having seats up and full interior will help even more!

 

 

I had a quick look on etka and didn't spot polo/fabia difference; and I'm in that area on both today and not seeing diffs in reality either. So bum steer earlier from me, sorry.

I found that a lot of road/tyre noise comes from the boot/rear wheel-arch and rear seat area. I did all of mine with self-adhesive closed cell foam and it made a considerable difference. Also fitted the under-bonnet sound deadening pad from a vRS which also helped but yours should already have that being a vRS.

Being married for close to 50 years, I find the noise qualities of mine nice at speed, and when slow, it allows Mrs V to act as a second pair of eyes in blind spots , so it's " a bit of noise makes for happier marriage" .😁

On 12/04/2020 at 22:36, TMB said:

I found that a lot of road/tyre noise comes from the boot/rear wheel-arch and rear seat area. I did all of mine with self-adhesive closed cell foam and it made a considerable difference. Also fitted the under-bonnet sound deadening pad from a vRS which also helped but yours should already have that being a vRS.

Sounds good. Out of interest, how thick was the foam you used ? I've ordered six mm closed cell foam 

4 hours ago, Johnnynapalm said:

Sounds good. Out of interest, how thick was the foam you used ? I've ordered six mm closed cell foam 

 

 Same thickness on a 5m x 1m roll. I doubled it up in some places on the car too. 🙂

17 hours ago, TMB said:

 

 Same thickness on a 5m x 1m roll. I doubled it up in some places on the car too. 🙂

Never thought of doubling it up. Good idea. Car completely stripped out today. I found a good level of sound proofing in the front. Deadened, felt and vinyl matting on top. Nothing much in the rear foot Wells or boot though 

Yeah, they don't put much at the back.

On 12/04/2020 at 12:36, corndog said:

in the process of doing this on my ibiza 6L 2004 sport. it has already got a sound deadening sheet in both drivers and passengers foot well and thick underlay that may or may not be decent soundproofing. unsure if the fabias will have the same?

 

covering rear wheel arches apperently help, having seats up and full interior will help even more!

 

 

Looks like it's the same as yours then. The deadening and sound proof looks decent to me as well. I think iure right about the rear as it's got basically nothing except abit of felt under the rear foot Wells 

A bit of lead flashing tape on the inside of the door skins makes a surprising amount of difference in my experience. Also make sure your doors and drop glass seals are good.

 

The existing sound mat under the carpet has probably been soaked on most of these cars, so get it replaced.

 

Also check your wheel bearings.

Edited 15 April, 20206 yr by StevesTruck

2 hours ago, StevesTruck said:

A bit of lead flashing tape on the inside of the door skins makes a surprising amount of difference in my experience. Also make sure your doors and drop glass seals are good.

 

The existing sound mat under the carpet has probably been soaked on most of these cars, so get it replaced.

 

Also check your wheel bearings.

Didn't think if changing the existing underlay. Good point. 

 

What do you think of replacing the existing sound deadening bitumen deadening? I've got butyl based deadening to replace with. 

 

Cheers 

Jp 

1 hour ago, Johnnynapalm said:

Didn't think if changing the existing underlay. Good point. 

 

What do you think of replacing the existing sound deadening bitumen deadening? I've got butyl based deadening to replace with. 

 

Cheers 

Jp 

 

Mine has gotten louder subtly over the years. I think after about 4 years the top mounts started letting more tyre noise through. Rear boot area, especially around the wheelarches is the place to bitch the hell out of with flashing tape layers or dynamat etc. Plus 30mm BAF or similar. Boot floor could do with more flashing plus at least another 30mm of BAF. Other major panel with little there would be the roof.

 

I also got the "upper engine noise isolater". Big foam thingy that sits around the cam-cover on the 1.9 TSI PD. That worked at the time. It's looking a little frayed at the moment though.

On 15/04/2020 at 21:54, StevesTruck said:

A bit of lead flashing tape on the inside of the door skins makes a surprising amount of difference in my experience. Also make sure your doors and drop glass seals are good.

 

The existing sound mat under the carpet has probably been soaked on most of these cars, so get it replaced.

 

Also check your wheel bearings.

The sound mat under the carpet stunk to high heaven ! Thanks for the tip.....being replaced with mass loaded vinyl

On 16/04/2020 at 01:35, vindaloo said:

 

Mine has gotten louder subtly over the years. I think after about 4 years the top mounts started letting more tyre noise through. Rear boot area, especially around the wheelarches is the place to bitch the hell out of with flashing tape layers or dynamat etc. Plus 30mm BAF or similar. Boot floor could do with more flashing plus at least another 30mm of BAF. Other major panel with little there would be the roof.

 

I also got the "upper engine noise isolater". Big foam thingy that sits around the cam-cover on the 1.9 TSI PD. That worked at the time. It's looking a little frayed at the moment though.

I didn't even realise the plastic engine cover was a noise isolator. That's getting re  foamed.  cheers

Edited 20 April, 20206 yr by Johnnynapalm

22 minutes ago, Johnnynapalm said:

I didn't even realise the plastic engine cover was a noise isolator. That's getting re  foamed.  cheers

 

Have a look at this https://www.briskoda.net/forums/topic/479976-does-the-plastic-engine-cover-help-cut-down-noise/  I've posted the stuff I used under my plastic cover and it cut the noise by 6db