Ausmini
It is currently Mon Aug 18, 2025 9:42 pm

All times are UTC + 10 hours




Post new topic Reply to topic  [ 16 posts ]  Go to page 1, 2  Next
Author Message
 Post subject: Making the car quieter
PostPosted: Wed Feb 13, 2008 9:38 pm 
Offline
1360cc
1360cc
User avatar

Joined: Mon Aug 23, 2004 10:07 pm
Posts: 10654
Location: SE Melbourne
My car is quite noisy inside, particularly when the engine is on and the car is moving.
So I want to make the thing quieter, and am looking for tips for things to use/places
to do things.

So far, the plan consists of:
-Second muffler
-dynamat on the inside of the firewall, and in the footwell areas
-more dynamat against the rear seat, and in the rear 1/4 panels
-carpet underlay or some kind (currently running none)

The other thing is if I put dynamat on the rear seatback, and then (like most young whipper snappers con-sarn-it) want a subwoofer in the boot, will it cut a lot of the sound from it, making it a pointless install?

Currently the exhaust system is some LCBs and a single muffler at the rear, I don't
know what type it is.

Thanks.
:D


Top
 Profile  
 
 Post subject:
PostPosted: Wed Feb 13, 2008 9:45 pm 
Offline
1275cc
1275cc
User avatar

Joined: Tue Aug 17, 2004 1:21 pm
Posts: 3391
Location: Western Queensland
don't forget to but dynamat on the doors. and sides of the car as that is where a lot of noise is generated and also replace your seals with new ones

_________________
Image


Top
 Profile  
 
 Post subject:
PostPosted: Wed Feb 13, 2008 9:45 pm 
Offline
1275cc
1275cc
User avatar

Joined: Wed Jun 22, 2005 11:05 pm
Posts: 3034
Location: Sydney, NSW
i cannot offer any help ..
but good topic.. i've been thinking the same thin for a while now..


how about earplug harley ?

_________________
Image


Top
 Profile  
 
 Post subject:
PostPosted: Wed Feb 13, 2008 9:51 pm 
Offline
1360cc
1360cc
User avatar

Joined: Mon Aug 23, 2004 10:07 pm
Posts: 10654
Location: SE Melbourne
The earplugs would interfere with my current sound deadener........more noise......from the stereo.
:D


Top
 Profile  
 
 Post subject:
PostPosted: Wed Feb 13, 2008 9:59 pm 
Offline
1275cc
1275cc
User avatar

Joined: Sat Apr 14, 2007 8:34 pm
Posts: 3415
Location: Cowra
Yeah mycar was too noisy - I got threatened to be defected. i had twin exit pipes with a hotdog - i was heard and not seen :D . Anyway i got another one on and he left the hot dog there and put a split chambered one on and it quietened it down dramatically you can now talk to each other at 100kmh. Plenty of sound deadener/ underfelt will go a long way


Top
 Profile  
 
 Post subject:
PostPosted: Wed Feb 13, 2008 10:00 pm 
Offline
ET 13.457 seconds , OH YEAH !!!!
User avatar

Joined: Sun Sep 19, 2004 8:35 am
Posts: 7826
Location: Somewhere Around Sydney
new seals all round and some body deadener in the wheel arches/underseal on the bottom of the car..or more coats..

_________________
Image
Starlet Conversion:
http://www.ausmini.com/forums/viewtopic.php?t=15484


Top
 Profile  
 
PostPosted: Wed Feb 13, 2008 10:28 pm 
Offline
Yay For Hay!
User avatar

Joined: Wed Sep 08, 2004 9:27 pm
Posts: 15912
Location: Wodonga - Vic/NSW border
Harley wrote:
particularly when the engine is on and the car is moving.


easy... do like Hanra and trailer it everywhere

_________________
did I tell you that I won a trophy?


Top
 Profile  
 
PostPosted: Wed Feb 13, 2008 10:58 pm 
Offline
1275cc
1275cc
User avatar

Joined: Sun Jul 01, 2007 11:25 pm
Posts: 5174
Location: Greensborough, Victoria
simon k wrote:
Harley wrote:
particularly when the engine is on and the car is moving.


easy... do like Hanra and trailer it everywhere


:lol: :lol: :lol: :lol: :lol: :lol: :lol: :lol: :lol: :lol: :lol: :lol: :lol: :lol:

_________________
http://www.youtube.com/watch?v=nDMkVq1jRGU


Top
 Profile  
 
PostPosted: Thu Feb 14, 2008 9:52 am 
Offline
1360cc
1360cc
User avatar

Joined: Tue Mar 16, 2004 8:55 am
Posts: 11264
Location: Geelong, Victoria
Harley wrote:
My car is quite noisy inside, particularly when the engine is on and the car is moving.


Man there is some good quotes coming post Krash08!

Dynamat it like crazy.

What does the parcel shelf consist of on a Rover? Like a Aussie Mini, where there are little to no holes/vents?

_________________
Image


Top
 Profile  
 
PostPosted: Thu Feb 14, 2008 10:47 am 
Offline
1275cc
1275cc
User avatar

Joined: Thu Mar 18, 2004 1:33 pm
Posts: 2213
Location: Darling Downs QLD
Harley wrote:
So far, the plan consists of:
-Second muffler
-dynamat on the inside of the firewall, and in the footwell areas
-more dynamat against the rear seat, and in the rear 1/4 panels
-carpet underlay or some kind (currently running none)


All good strategies. A second 'muffler' will help a lot, as will new door and window rubbers.

I used dynamat extreme on the entire floorpan, and firewall, and a thicker layer of dynamat Extremeliner on the firewall and front footwells.

I would also use a 'blanking plate' or similar to cover the speedo hole from the engine bay, then cover this whole area with dynamat as well. This is where you get a lot of induction noise coming through.

The other areas to do are inside the doors, inside the rear quarter panels and the boot lid. & on the rear seat back. This won't be cheap.

Harley wrote:
The other thing is if I put dynamat on the rear seatback, and then (like most young whipper snappers con-sarn-it) want a subwoofer in the boot, will it cut a lot of the sound from it, making it a pointless install?


Dynamat reduces panel resonanance, and distortion. By applying dynamat to your car's panels you will reduce road noise and reduce vibrations to a minimum. (it might sound like there are more, but that is cos you can here them now :wink: ). The other great benefit is that you can have a large sub (if that's your thing) and it will sound better. Cleaner, deeper and clearer. Effectively louder too, as it isn't competing against as much road noise.

If you are going to install it in the boot, some other things to consider;
1) You need to have a bass port into the 'cabin' to make it effective, dynamat or no dynamat.
2) You will have a lot of panel resonance from the fuel tank and boot lid, rear parcel shelf etc, so more dynamat will be needed.
3) No more room for luggage :roll:

Hope this helps, and get the stuff off ebay, best price in Aust. Here is the link to the dynamat site:
http://www.dynamat.com/products_car_audio_introduction.html

Here is a link to what's on ebay now:
Cheers

Matthttp://search.ebay.com.au/search/search.dll?sofocus=bs&sbrftog=1&dfsp=1&from=R10&_trksid=m37&satitle=dynamat&sacat=-1%26catref%3DC6&sargn=-1%26saslc%3D2&sadis=200&fpos=4370&sabfmts=1&fobfmt=1&saobfmts=insif&ga10244=10425&ftrt=1&ftrv=1&saprclo=&saprchi=&fsop=1%26fsoo%3D1

_________________
68 Deluxe.... it's shiny..... I like shiny!!


Top
 Profile  
 
 Post subject:
PostPosted: Thu Feb 14, 2008 11:40 am 
Offline
ausmini mod
ausmini mod
User avatar

Joined: Tue Jun 06, 2006 8:47 am
Posts: 1938
Location: Kellyville, NSW
Isnt Dynamat really heavy? I know a mate who had it installed due to sound system (showcar only) and after dynamatting the wazoo out of the thing, it added close to 100kgs :shock:

Peter

_________________
Image
Click here for the Turbo Conversion Thread!


Top
 Profile  
 
 Post subject:
PostPosted: Thu Feb 14, 2008 11:54 am 
Offline
848cc
848cc
User avatar

Joined: Tue Feb 20, 2007 12:44 pm
Posts: 396
Location: Sydney
Quote:
I know a mate who had it installed due to sound system (showcar only) and after dynamatting the wazoo out of the thing, it added close to 100kgs


I'd be interested to know how heavy dynamat is too. When I restore my car I intended to dynamat everywhere. If it adds 100kg I will put up with the noise.

Also worth checking for loose or broken grommets in the firewall. That can let in heaps of engine noise. A broken gearlever boot is another common entry point for noise.

Pete


Top
 Profile  
 
 Post subject:
PostPosted: Thu Feb 14, 2008 11:55 am 
Offline
1360cc
1360cc
User avatar

Joined: Mon Aug 23, 2004 10:07 pm
Posts: 10654
Location: SE Melbourne
I'm familiar with dynamat and how good it is.....last year I did the swift.
Biggest difference was the (effective) increase in bass from the sub.

If I get really organised (unlikely) I'll take some sound meter measurements as I do things,
and weigh what I put in. (i could also measure my 0-80 kph times to be a wally as well)
:D


Top
 Profile  
 
 Post subject:
PostPosted: Thu Feb 14, 2008 2:08 pm 
Offline
1275cc
1275cc
User avatar

Joined: Thu Mar 18, 2004 1:33 pm
Posts: 2213
Location: Darling Downs QLD
pristic wrote:
Isnt Dynamat really heavy? I know a mate who had it installed due to sound system (showcar only) and after dynamatting the wazoo out of the thing, it added close to 100kgs :shock:

Peter


By the time I will have finished, there will be close to 25-30kg of sound proofing (dynamat) in my mini. The heavy one is the Extremeliner, as it has a layer of lead. But if you use the Dynamat Extreme, with a lightweight underfelt under the carpets, you'll do pretty much the whole car for the addition of 20kgs.

Great for daily drivers, not so much for weekend warriors.

Hasn't hurt the performance of my mini noticeably. :wink: :wink:

Cheers

matt

_________________
68 Deluxe.... it's shiny..... I like shiny!!


Top
 Profile  
 
 Post subject:
PostPosted: Thu Feb 14, 2008 3:37 pm 
Offline
1360cc
1360cc

Joined: Mon Nov 01, 2004 4:36 pm
Posts: 7673
the most important panel you can apply dynamat to is the roof :wink:

because dynamat is so dense, it absorbs sound waves,
and because it adds mass to the panels, it changes the frequency the panels resonate at (which means the speakers wont be fighting against their own sound waves bouncing back off the panels.)

yes it adds a lot of weight, but modern cars weigh a lot more than old ones and are much quieter.

a twin box exhaust is a good idea, the larger the pipe the louder the exhaust so leave the 2" for the racetrack., and adding a rolled in tip and having a side exit will also help reduce noise.

all the other suggestions are good 8)


Top
 Profile  
 
Display posts from previous:  Sort by  
Post new topic Reply to topic  [ 16 posts ]  Go to page 1, 2  Next

All times are UTC + 10 hours


Who is online

Users browsing this forum: Bing [Bot] and 330 guests


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 post attachments in this forum

Jump to:  

© 2016 Ausmini. All garage work involves equal measures of enthusiasm, ingenuity and a fair degree of irresponsibility.