Welcome to 911UK
The only place for Porsche, 911uk is the definitive enthusiast and resource site for the Porsche 911.
Registration is fast, simple and absolutely free, so join up today for full access to the site and benefit from latest member offers.

Porsche Classifieds
Porsche Buyers Guides
Sell Your Porsche on 911uk
Create a Free Classified Advert
Search Ads
Classified Adverts FAQ
Trade Classified Information
Buyer & Seller Fraud Protection
Consumer Rights Act
Pre Purchase Inspection (PPI)
Porsche Car Sourcing
Porsche Cars Wanted
Official Porsche Centre Reviews
Model
Stock
Porsche 911
991 : 2011- 14
997 : 2004- 79
996 : 1997-2005 48
993 : 1993-1998 5
964 : 1989-1993 6
Carrera 3.2 : 1983-1989 0
Carrera SC : 1977-1983 1
930 Turbo : 1975-1989 0
Early 911 : 1964-1977 0
Porsche Other Models
Classic : 1950-1965 0
Boxster : 1997- 14
Cayman : 2005- 19
Cayenne : 2003- 8
Macan : 2014- 4
Panamera : 2009- 1
912-914-924-928-944-968 3
959 - CarreraGT - RaceCar 1
Car Parts For Sale & Wanted
Other Items For Sale & Wanted
Wheels Tyres For Sale & Wanted
Number Plates For Sale Wanted

Porsche Services
Porsche Body Shop Repair
Paint Protection & Wrapping
Porsche Classic Insurance
Porsche Classic Parts
Porsche Classic Restoration
Porsche Design Collection
Porsche Engine Gearbox Rebuild
Porsche Heritage & History
Porsche News
Porsche Picture Gallery
Win a New Porsche 911

Porsche Parts
Body Parts, Body Styling
Brakes, Clearance
Electrical, Exhausts
Engine Cooling, Engine Electrical
Engine Rebuild, Heating Cooling
Interior Incar, Lighting
Rubber Seals, Service Parts
Steering, Suspension
Transmission, Workshop Tools
Early 911, 911 - 930, 928 - 968
964 - 993, 996 - 997, Boxster
Cayman, Cayenne, Panamera

Porsche Model Range
911 [991] 2011-Current
Porsche 911 [991]
911 [997] 2004-Current
Porsche 911 [997]
911 [GT] GT1-GT2-GT3
Porsche 911 [GT]
911 [996] 1997-2005
Porsche 911 [996]
911 [993] 1993-1998
Porsche 911 [993]
911 [RS] RS-RSR
Porsche 911 [RS]
911 [964] 1989-1993
Porsche 911 [964]
911 3.2 1983-1989
Porsche 911 3.2 Carrera
911 SC 1977-1983
Porsche 911 SC
911 [Early] 1964-1977
Porsche 911 [Early]
Boxster & Cayman
Porsche Boxster & Cayman
Cayenne & Panamera
Porsche Cayenne & Panamera

911uk Site Partners

Post new topic   Reply to topic
Author Message
Luke997
Newbie


Joined: 20 Sep 2017
Posts: 9



PostPosted: Wed Feb 07, 2018 3:34 pm    Post subject: Soundproofing success on the 997.1 Reply with quote

Hi all, I managed to get a good result in tackling the excessive road noise on my 997.1, but had a few learning points to pass on if someone should google Porsche 997 sound proofing. You could make a difference to a 997 just by doing under the driver and passenger footwell and the outer rear arches through the speaker openings, which wouldn't take too long, but I went full monty and did as much as I could, adding about 5kg of soundproofing dynamat extreme. There wasn't much reduction in engine noise, if you have a sports exhaust you'll still hear it just fine.

Ultimately, I managed to get my cabin interior noise on the motorway down from approx 91db to about 87 using the decibel X app on my phone, which doesn't sound like a lot, but due to the exponential of how Db is measured, I've cut my interior cabin noise by half (noise doubles every 3 db) I still have new tyres to put on which will ultimately help a lot too. Ultimately, auwful sections of poor road will still transmit a lot of noise through any soundproofing, but I'm now much happier as it's now easier to hear the nicer aspects of the ehaust as it isn't all drowned out by tyre roar.

I ordered this pack of dynamat which was more than enough. If you want even better results than me, also consider some Dynaliner too. https://www.amazon.co.uk/Dynamat-10455-Xtreme-Bulk-Pack/dp/B00020CB2S

You will also benefit from a interior trim removal tool and a narrow rubber roller to press the film down.

This book is also very useful. 101 Projects for Your Porsche 911 996 and 997 1998-2008 (Motorbooks Workshop) https://www.amazon.co.uk/dp/0760344035/ref=cm_sw_r_cp_tai_PtXEAbG4HKKZT

I did the doors and driver passenger footwell first, followed by the rear arches. I decided that the doors were an important step as I measured the db in different locations within the car and it was also fairly high near the large speakers within the doorcards.

Doors-
Some of the clips in the door cards are very difficult and will almost certainly break off. It would be useful ordering five clips in advance. My end result was similar to what was achieved in this link, but Also made sure I left the side impact airbag eruption point in the door card clear of dynamat. http://www.audiofile-incar.co.uk/audio-upgrades/porsche-997

It is also important to remove the large speaker to give you access to the metallic skin of the door on the naked inside 'wet side' of the door, and you can apply a generous amount of dynamat where it will be most effective.

After the doors it is the drivers and passenger footwell, dynamating whatever I could underneath the carpet. The metal of the floor was very tinny here and my highest decibel measurement on the motorway was from the footwell and near the rear speakers on the rear arches. The footwells were relatively straight forward to do and didn't really need the front seats removing, I just peeled back the carpet and applied what I could. The only difficulty was unplugging the accelerator pedal which took about ten minutes of perseverance to press the pale coloured clip into the connector enough to release the plug. Once you've pressed the clip enough, it clicks and stays pressed into the connector. Some of the carpet is retained via contact adhesive so having some to hand for putting the carpet back is a good idea. Also be careful not to block your water drainage holes with dynamat.

Next came the removal of the rear trim and carpet. I left the drivers and passenger seat in to do this but it made the job very aukward. I would advise taking them out. Once the rear seats were removed and the trim was all peeled back I dynamatted whatever I could get to, paying particular attention to the rear arches. Contact adhesive again here was useful. Of note is that there is a significant amount of naked metal wheel arch just the other side of the rear speakers - if you move a bit of trim out the way you can dynamat a substantial amount of extra wheel arch through the rear speaker access hole. This is an important area which a lot of people will miss. I then used dynamat to cover over the hole in the chassis behind the speaker to seal it all off.

I eventually got all the trim back, the total job for the whole car took about 15 hours. After reconnecting the battery, both my windows wouldn't work, and failed slightly retracted, this was due to not quite connecting one of the purple electrical connnections in the drivers door. You also get a PSM failure caption illuminate on the dashboard after reconnecting the battery, which will clear fairly shortly after you start driving down the road.

If you are tight on time and don't have many tools / competence then you can definitely apply dynamat under the footwell carpet, and also onto a significant amount of the rear arches merely by removing the rear speakers.

Sorry for the massive amount of info but I hope it helps someone else if they are considering doing the job properly. I can still hear my exhaust just fine but now have a lot less road noise from the tyres.

Last edited by Luke997 on Wed Feb 07, 2018 9:03 pm; edited 3 times in total
 



IMG_5785.JPG
 Description:
I hope the other car in the garage shows I'm not a wuss who can't handle road noise 😂
 Filesize:  124.2 KB
 Viewed:  1347 Time(s)

IMG_5785.JPG



IMG_5773.JPG
 Description:
Door card photo 2
 Filesize:  121.97 KB
 Viewed:  1347 Time(s)

IMG_5773.JPG



IMG_0502.JPG
 Description:
Door card photo
 Filesize:  1.43 MB
 Viewed:  1353 Time(s)

IMG_0502.JPG


  
View user's profile Send private message
   
redbaron1973
Trainee


Joined: 10 Sep 2017
Posts: 60
Location: Lancashire


PostPosted: Wed Feb 07, 2018 3:41 pm    Post subject: Reply with quote

thanks - am planning tackling my rear arches...
 
  
View user's profile Send private message
   
boardingnath997
Trainee


Joined: 28 Sep 2016
Posts: 56



PostPosted: Wed Feb 07, 2018 3:48 pm    Post subject: Reply with quote

Great work. This is something I am looking at doing although not as a DIY job. Does anyone have any good recommendations for someone in South/West London or Surrey?
 
  
View user's profile Send private message
   
KP964
Watkins Glen


Joined: 20 Feb 2012
Posts: 2169
Location: Northumberland


PostPosted: Wed Feb 07, 2018 3:50 pm    Post subject: Reply with quote

You will have to drive around with the windows closed Dont know
_________________
Stone Grey Metallic 964 C4
Guards Red 964 C4 sold
 
  
View user's profile Send private message
   
911UK
Porsche Community
Porsche Community


Joined: 15 May 2002
Posts: 9548
Location: 911UK

1997 Porsche 993 Carrera 2

PostPosted: Wed Feb 07, 2018 3:52 pm    Post subject: Reply with quote

Nicely done Luke997

do you have any pic of the work whilst it was in progress
_________________
Get a Porsche Car Insurance Quote


FOLLOW 911UK ON FACEBOOK
 
  
View user's profile Send private message Send e-mail Visit poster's website
   
Mezgerite
Silverstone


Joined: 02 Nov 2016
Posts: 102



PostPosted: Wed Feb 07, 2018 6:00 pm    Post subject: Reply with quote

I don't think the doors will achieve much, it's the rear arches that are the killer. It would help to apply something on the outside of them too.

M
 
  
View user's profile Send private message
   
Maxie
General
General


Joined: 11 Mar 2007
Posts: 8399
Location: London


PostPosted: Wed Feb 07, 2018 6:10 pm    Post subject: Reply with quote

Well played Luke997! This was a constant bugbear in my previous car (also a 997); the road noise almost killed off anything that was coming from the Bose sound system when travelling at motorway speeds. Quite possibly the biggest gripe I had in my car. If you have pictures, these would be welcome on the forum.

~ Maxie Thumb
_________________
Currently Porscheless
2013 Jaguar XJL 3.0 V6 Supercharged
 
  
View user's profile Send private message Send e-mail
   
Jay.
Nürburgring


Joined: 20 Oct 2015
Posts: 449
Location: Brize Norton


PostPosted: Wed Feb 07, 2018 6:44 pm    Post subject: Reply with quote

Dynamat is incredible stuff, but there are plenty of off-brand options if you're not keen to spend that much.

I'd personally stick to using Dynamat on these cars, but I used some cheaper alternative for my Mx5 track car
_________________
2004 996 Turbo

Seal Grey
Motec 19" Alloys
AMG Flappy Paddles

1972 Datsun 240z

RB25DET
Devil Z


Follow me on Instagram! @rb.240z
 
  
View user's profile Send private message
   
Alfaian
Imola


Joined: 12 Mar 2014
Posts: 779
Location: S.wales


PostPosted: Wed Feb 07, 2018 6:47 pm    Post subject: Reply with quote

Sound deadening? In a 911 ? what

I must be in the minority who actually like the road noise Smile

All that dynamat must weigh a fair bit too.
_________________
Arctic silver C2S
 
  
View user's profile Send private message
   
Phil 997
Donnington
Donnington


Joined: 05 Dec 2015
Posts: 12828
Location: Bournemouth,Dorset

2009 Porsche 997 Carrera 4S

PostPosted: Wed Feb 07, 2018 7:16 pm    Post subject: Reply with quote

Thats a good Post , I know it was discussed doing the rear arches in another recent thread think it was a Boba thread. I was led to understand the soundproofing in the gen2 is much better but it would be interesting to know what could be improved and were on a gen2 if anyones done it.
personally I found fitting a cargraphic sports exhaust has got rid of almost all my road noise Grin Grin but joking aside if the footwells were not well deadened on a gen2 I would be up for doing that. Thumb
_________________
911 Owners,Some Invest In The Future,
Others Enjoy The Moment Today.
 
  
View user's profile Send private message
   
SGH
Monza


Joined: 06 Jan 2018
Posts: 177
Location: East Sussex


PostPosted: Wed Feb 07, 2018 7:43 pm    Post subject: Reply with quote

Dynamat in conjunction with Dynaliner gives great results I did my Defender 130 with it a few years back the difference it made was amazing..
_________________
Porsche 997.2 Carrera 4S - Carrara White / Cocoa
Defender 300Tdi 110 HCP - Keswick Green
Connect L2 Double Cab - Moondust Silver
Connect L1 - Moondust Silver
VW California Ocean 150PS DSG - Reflex Silver
 



DSC_0019.jpg
 Description:
 Filesize:  628.74 KB
 Viewed:  1413 Time(s)

DSC_0019.jpg



DSC_0020 2.jpg
 Description:
 Filesize:  605.82 KB
 Viewed:  1418 Time(s)

DSC_0020 2.jpg


  
View user's profile Send private message
   
Boba fett
Watkins Glen


Joined: 14 May 2015
Posts: 2207



PostPosted: Wed Feb 07, 2018 8:00 pm    Post subject: Reply with quote

I did this some of this on mine, when I stripped out the seat belts. Most of the noise from a 997 comes from the rear tyre roar amplified through the rear arches.

The rear quarters and arch's have a 2 inch piece of foam, that does nothing, putting Dynamat or better down as well makes a big difference.
 
  
View user's profile Send private message
   
G2
Hockenheim


Joined: 26 Oct 2015
Posts: 702



PostPosted: Wed Feb 07, 2018 8:11 pm    Post subject: Reply with quote

Great post Luke. Dynamat extreme is seriously good stuff. had a vw T5 lined with it and the difference was startling. The big van doors and tailgate clunk rather than rattle when shut.
_________________
997 Gen2 Turbo S - Speed.
991 C4S - Riviera.
 
  
View user's profile Send private message
   
pcat
Spa-Francorchamps


Joined: 16 Oct 2013
Posts: 294



PostPosted: Wed Feb 07, 2018 8:26 pm    Post subject: Reply with quote

Alfaian wrote:
Sound deadening? In a 911 ? what

I must be in the minority who actually like the road noise Smile

All that dynamat must weigh a fair bit too.


I though this would be a thread about removing sound proofing around the rear seats to get more induction noise into the cabin



I hear Nissan Leafs are really quiet




Its it leafs or leaves?
 
  
View user's profile Send private message
   
Luke997
Newbie


Joined: 20 Sep 2017
Posts: 9



PostPosted: Wed Feb 07, 2018 9:09 pm    Post subject: Reply with quote

Thanks for the feedback everyone, I've added only a few pictures which I managed to get, sorry I should have taken some more. Just to add to the original post, there is a lot of talk about rear arches, but I took the car out on the motorway after doing the left hand passenger door and footwell, and logged a decibel drop of about 1.5 - 2 compared to the in un soundproofed right hand side, especially within the footwell. There is just as much noise coming into the car from the footwell, so it is worth doing, and it is among the easiest of all the areas to do, especially if you have left over dynamat after doing the rear arches!
 
  
View user's profile Send private message
   
Alfaian
Imola


Joined: 12 Mar 2014
Posts: 779
Location: S.wales


PostPosted: Wed Feb 07, 2018 10:20 pm    Post subject: Reply with quote

pcat wrote:
Alfaian wrote:
Sound deadening? In a 911 ? what

I must be in the minority who actually like the road noise Smile

All that dynamat must weigh a fair bit too.


I though this would be a thread about removing sound proofing around the rear seats to get more induction noise into the cabin



I hear Nissan Leafs are really quiet






Its it leafs or leaves?


Grin

I would've bought a nice jag or Bentley if I wanted little road noise, not a Porsche Smile and all that added weight Hand

Each to their own I suppose.
_________________
Arctic silver C2S
 
  
View user's profile Send private message
   
Boba fett
Watkins Glen


Joined: 14 May 2015
Posts: 2207



PostPosted: Wed Feb 07, 2018 10:24 pm    Post subject: Reply with quote

Alfaian wrote:
pcat wrote:
Alfaian wrote:
Sound deadening? In a 911 ? what

I must be in the minority who actually like the road noise Smile

All that dynamat must weigh a fair bit too.


I though this would be a thread about removing sound proofing around the rear seats to get more induction noise into the cabin



I hear Nissan Leafs are really quiet






Its it leafs or leaves?


Grin

I would've bought a nice jag or Bentley if I wanted little road noise, not a Porsche Smile and all that added weight Hand

Each to their own I suppose.


You like Tyre roar nooo nooo nooo
 
  
View user's profile Send private message
   
Alfaian
Imola


Joined: 12 Mar 2014
Posts: 779
Location: S.wales


PostPosted: Wed Feb 07, 2018 10:36 pm    Post subject: Reply with quote

Boba fett wrote:
Alfaian wrote:
pcat wrote:
Alfaian wrote:
Sound deadening? In a 911 ? what

I must be in the minority who actually like the road noise Smile

All that dynamat must weigh a fair bit too.


I though this would be a thread about removing sound proofing around the rear seats to get more induction noise into the cabin



I hear Nissan Leafs are really quiet






Its it leafs or leaves?


Grin

I would've bought a nice jag or Bentley if I wanted little road noise, not a Porsche Smile and all that added weight Hand

Each to their own I suppose.


You like Tyre roar nooo nooo nooo


It's only a pain on concrete sectioned roads and there's not many around to be adding the extra weight of dynamat.

It's ok for you turbo owners but us pauper Carrera owners need all the help we can get Grin
_________________
Arctic silver C2S
 
  
View user's profile Send private message
   
Luke997
Newbie


Joined: 20 Sep 2017
Posts: 9



PostPosted: Thu Feb 08, 2018 8:14 am    Post subject: Reply with quote

Alfaian wrote:
pcat wrote:
Alfaian wrote:
Sound deadening? In a 911 ? what

I must be in the minority who actually like the road noise Smile

All that dynamat must weigh a fair bit too.


I though this would be a thread about removing sound proofing around the rear seats to get more induction noise into the cabin



I hear Nissan Leafs are really quiet






Its it leafs or leaves?


Grin

I would've bought a nice jag or Bentley if I wanted little road noise, not a Porsche Smile and all that added weight Hand

Each to their own I suppose.



FYI it only required about 5kg of dynamat, and Improves the soundproofing to a similar level that the 997.2 has.
 
  
View user's profile Send private message
   
FRP
Barcelona


Joined: 30 Apr 2014
Posts: 1315
Location: Middlesex


PostPosted: Thu Feb 08, 2018 8:42 am    Post subject: Reply with quote

Good work. Each to their own

I only have a 996t and to be honest when poodling around can just about hear the stereo. When pressing on and or on Boost. I cannot hear the stereo. I like it that way !
_________________
2002 996tt x50 manual in bassat black - 9eXX
 
  
View user's profile Send private message
   
Display posts from previous:   
Post new topic   Reply to topic   All times are GMT - 12 Hours
Goto page 1, 2  Next
Page 1 of 2

 
Jump to:  

You cannot post new topics in this forum
You cannot reply to topics in this forum
You cannot edit your posts in this forum
You cannot delete your posts in this forum
You cannot vote in polls in this forum
You can attach files in this forum
You can download files in this forum
You cannot post calendar events in this forum