Has anyone tried dynamat in the wheel well/boot floor?

 

Last 3 cars i've owned, i've put dynamat all over the wheel well, across the boot floor and over the rear wheel arches (then put the carpet etc back down over the top) and have noticed massive inprovements in NVH in all of them. The wheel well especially, even in sedans shows a very large improvement in road noise (along with rear wheel arches). If you have any left over, the front doors respond very well to more sound deadening too.

 

I see this and carpet has been mentioned, but no one has said if they've given it a go and what results they got.

I've just been out to check, my combi has the holes only on one side too. I've not had more poking around as it was poring rain today so will get a good look on Thursday

My hatch has them on both, and I can't see or feel any insulation type material through the holes.

Where can i find the other tread you (snala) are reffering to? 

 

This one http://www.briskoda.net/forums/topic/317570-bloody-boot/ extra to that is the car steams up the back window a lot easier than the old one when its cold so another air circulation indicator there maybe too?

 

Looks like the hatches have the air holes in the panels on both sides but maybe still not the breather on both. I might try and get the panel off on the drivers side so I can see what its like behind there and if the insulation is covering the breather, You can just pull the panel away from the side at the mo as its all quite loose but its still attached at the top and bottom and has the hooks for luggage, parcel shelf etc holding it too.

 

Okay thanks for looking  andyvee. Do you have the noise though?

This one http://www.briskoda.net/forums/topic/317570-bloody-boot/ extra to that is the car steams up the back window a lot easier than the old one when its cold so another air circulation indicator there maybe too?

 

Looks like the hatches have the air holes in the panels on both sides but maybe still not the breather on both. I might try and get the panel off on the drivers side so I can see what its like behind there and if the insulation is covering the breather, You can just pull the panel away from the side at the mo as its all quite loose but its still attached at the top and bottom and has the hooks for luggage, parcel shelf etc holding it too.

 

Okay thanks for looking  andyvee. Do you have the noise though?

If you find a way to loosen the brackets for the parcel shelf, please let us know, i can't find any screws.

This one http://www.briskoda.net/forums/topic/317570-bloody-boot/ extra to that is the car steams up the back window a lot easier than the old one when its cold so another air circulation indicator there maybe too?

 

Looks like the hatches have the air holes in the panels on both sides but maybe still not the breather on both. I might try and get the panel off on the drivers side so I can see what its like behind there and if the insulation is covering the breather, You can just pull the panel away from the side at the mo as its all quite loose but its still attached at the top and bottom and has the hooks for luggage, parcel shelf etc holding it too.

 

Okay thanks for looking  andyvee. Do you have the noise though?

Not now, but I have had in the past. The dealer fiddled with the breather to fix the fuel flap opening every time you shut the boot, this caused the noise to start, but it went away after a couple of days. Now the fuel flap keeps popping open again though so back to the dealers yet again...........

I drove my VRS hatchback tonight to a stretch of shell grip road nearby that when I drive over it, the booming noise is horrendous. The hatch was empty, spare wheel and heavy rubber boot mat fitted. As expected really bad booming noise. I then opened the hatchback and closed it again only on the safety catch. Eg not fully closed. Repeated the exercise again and the noise was virtually undetectable. My question now is could this problem be related to the hatchback lid resonating when fully closed, or is it that the cabin air pressure is reduced because it can escape easier through the semi closed hatchback. Or is there any other suggestions ??? It would also be good if someone else could try the same experiment and compare the results. Thanks

Sounds a lot like an air pressure noise.....make sure that if you have it, note it with skoda so they can work on a fix. Likely there is a faulty batch of vents if some have it and other dont....

 

EDIT: is it like when you're on the motorway and open one window only and get that horrible "buffeting" noise/sound/feeling?

Edited 6 June, 201411 yr by GTR27

Sounds a lot like an air pressure noise.....make sure that if you have it, note it with skoda so they can work on a fix. Likely there is a faulty batch of vents if some have it and other dont....

 

EDIT: is it like when you're on the motorway and open one window only and get that horrible "buffeting" noise/sound/feeling?

Yes

I drove my VRS hatchback tonight to a stretch of shell grip road nearby that when I drive over it, the booming noise is horrendous. The hatch was empty, spare wheel and heavy rubber boot mat fitted. As expected really bad booming noise. I then opened the hatchback and closed it again only on the safety catch. Eg not fully closed. Repeated the exercise again and the noise was virtually undetectable. My question now is could this problem be related to the hatchback lid resonating when fully closed, or is it that the cabin air pressure is reduced because it can escape easier through the semi closed hatchback. Or is there any other suggestions ??? It would also be good if someone else could try the same experiment and compare the results. Thanks

Take a look at #252

Take a look at #252

Sorry #257

I drove my VRS hatchback tonight to a stretch of shell grip road nearby that when I drive over it, the booming noise is horrendous. The hatch was empty, spare wheel and heavy rubber boot mat fitted. As expected really bad booming noise. I then opened the hatchback and closed it again only on the safety catch. Eg not fully closed. Repeated the exercise again and the noise was virtually undetectable. My question now is could this problem be related to the hatchback lid resonating when fully closed, or is it that the cabin air pressure is reduced because it can escape easier through the semi closed hatchback. Or is there any other suggestions ??? It would also be good if someone else could try the same experiment and compare the results. Thanks

 

Exactly the same with mine. Left the boot on the catch and noise completely gone. Not the most practical thing to do before each journey though so hopefully a fix coming soon!

If it's simply a pressure problem then surely just opening a window slightly will alleviate the symptom. Otherwise I would be tempted to blame the tailgate itself as not being adjusted correctly.

Edited 6 June, 201411 yr by Leonblue

If it's simply a pressure problem then surely just opening a window slightly will allevn iate the symptom. Otherwise I would be tempted to blame the tailgate itself as not being adjusted correctly.

An open window has no effect.

An open window has no effect.

As I said then, I can't see how it can be due to a build up of cabin air pressure.

Edited 6 June, 201411 yr by Leonblue

At the begging mine did the same...but now after 9500km, it is not doing anymore. I don't even noticed. I think it was little by little.

I tried mine over the same stretch of road today again with the window down and it made no difference whatsoever.  My initial thought then was that it cannot be cabin air pressure. I may be well of track here, but I was thinking about it again tonight and wondered is it possible to have a different air pressure within the boot area from the cabin area ???? If that is possible my next move was to repeat the exercise with a window opened and a rear seat folded down. My thinking here is that the air pressure would be the same within the cabin and the boot area. As I say I may be well of track with this but it is doing my head in. Incidentally the "fault" has been logged with Skoda who say there is nothing wrong with the car. Thanks again.

As I said then, I can't see how it can be due to a build up of cabin air pressure.

It isn't pressure in the cabin it's pressure in the boot area hence leaving the boot slightly ajar seems to sort the problem and opening a window doesn't. Although the boot isn't air tight and isolated from the cabin completely it's isolated enough that air can't freely move between the 2 areas.

Then it must be the tailgate itself as Leonblue wrote earlier, but it make no sense to me what so ewer.
I noticed that on my car i can hear the noise even at very low speed under 20Km/h so i really think it's strange, because theres almost no movement in any parts.  

What happens if you open the sliding parcel shelf on a combi, or store it behind the rear seats on a hatch?

If its air flowing in the front of the car and not getting out the vents in the back like its supposed to then opening the window won't do it as the air is forced in even more that way when the car is moving and still can't get out. Be better to run the the car in recirculate mode to stop the flow of forced air pressurising the cabin but who wants to do that for long. This car steams up fast enough as it is without giving it help anyway.

Looking at the boot being its own air space that gets pressured I tried driving around with the parcel shelf off and with the seats down too and it helps a bit but still does it. It could just be that it isn't amplified in the enclosed space so sounds better.

I'm starting to think its the air pressure trapped inside and when the car is bumped or shaken on rough surfaces the chassis flexes enough and compresses the trapped air inside to make the interior walls, ceiling, rear seats or parcel shelf vibrate.

Edited 7 June, 201411 yr by snala

So what happens if you open the windows and reverse up the road?

What about drilling a hole in the bottom of the spare wheel well...

I think earlier in this post, somebody had found that adjusting the rubber tailgate buffers, i.e the bits that the tailgate closes onto, sorted the problem. I have to admit that IMO the tailgate moving about makes more sense to me than air pressure. Lets face it this car has one of the biggest hatch tailgates in the business, such a large piece of metal / glass is bound to be prone to flexing and other effects.

What about drilling a hole in the bottom of the spare wheel well...

I am sure there are rubber grommets in the rear of the wheel well. Maybe remove one of those?

I am sure there are rubber grommets in the rear of the wheel well. Maybe remove one of those?

Lol, and fill the boot with rain water spray off the roads, then start a new thread "my car keeps steaming up!"