Road noise

Grant · Post by **Grant** » Sun Oct 13, 2002 7:40 am

Any body done any sound deadening work? I would like to reduce the road noise
if possible. The road noise on coarse chip is quite high and drowns out the
noises I would prefer to hear from the exhaust. On smooth black top, it's very
acceptable.
Just fitted a winblocker (made locally by a local glass merchant) and the
effect is very good. Can hear the stereo at 100km/h easily. I can even talk on
my Ham radio at 100km/h with the roof off without any trouble. Of course, on
the twisty bits, the Ham radio and stereo are off so the drive (and exhaust
noises etc) can be enjoyed more!

Grant in Sunny Blenheim.
Yes, it's a sunny day already!

nmr · Post by **nmr** » Sun Oct 13, 2002 1:55 pm

smooth black top, it's very acceptable. Just fitted a winblocker (made
locally by a local glass merchant) and the effect is very good.

How about a photo and some details? Ta!

Aaron Hart · Post by **Aaron Hart** » Sun Oct 13, 2002 5:07 pm

Yeah I would be interested in how the winblocker was fitted and how it looks

Thanks .

Grant · Post by **Grant** » Sun Oct 13, 2002 11:35 pm

I'll attempt to photograph it (windblocker with a D!)and the installation
brackets as soon as I get the chance. I need to slightly modify the mounting
brackets, as it slightly interferes with the fitting of the roof cover, but
you will see the idea. Unfortunately the weather turned cold and wet so the
roof had to be raised in a hurry.

Grant in cold and wet Blenheim.

lou Girardin · Post by **lou Girardin** » Mon Oct 14, 2002 8:07 am

Tyre design is the biggest contributor to noise, but it's a little expensive
to try different types. Michelin MXF Sports are quiet for a performance tyre,
so to, I believe, are Toyo T1S's.
Using Dynamat acoustic deadening also works, it's not cheap though. Try doing
the boot lid and rear bulkhead 1st.
Lou

Grant · Post by **Grant** » Mon Oct 14, 2002 9:24 am

Thnks for the info, Lou. The tyres on my 1992 MX5 are Kumho Power Racer II,
(not a manufacturer that springs to my mind for these types of tyre) and about
half worn. The bank balance means I will wait until replacement time and do
some research then on tyres. I am not after very high performance as the car
is used for normal road use only. I'll see if I can get some sort of sound
deadening material as you suggest. Do you know where I can get it from?
The boot certainly needs something. It sure does resonate if anything is
dropped into it!

Grant in sunny Blenheim.

Gary Morrison · Post by **Gary Morrison** » Mon Oct 14, 2002 11:40 am

Lou,

Where does one obtain Dynamat in NZ?

Gary

jeff · Post by **jeff** » Mon Oct 14, 2002 12:34 pm

I use earplugs - good for 'turning down the volume' of wind, tyres etc. Music shops sell the proper musician's product - about $20 and it attenuates by 20-30 dB.

Jaycar sells rolls of inexpensive sound-deadening material , you can mail order thru their website. I think they have 2 stores in Auckland only.

hope that helps!

Subject: Road noise
Any body done any sound deadening work? I would like to reduce the road noise if possible. The road noise on coarse chip is quite high and drowns out the noises I would prefer to hear from the exhaust. On smooth black top, it's very acceptable. Just fitted a winblocker (made locally by a local glass merchant) and the effect is very good. Can hear the stereo at 100km/h easily. I can even talk on my Ham radio at 100km/h with the roof off without any trouble. Of course, on the twisty bits, the Ham radio and stereo are off so the drive (and exhaust noises etc) can be enjoyed more! Grant in Sunny Blenheim.Yes, it's a sunny day already!

lou Girardin · Post by **lou Girardin** » Mon Oct 14, 2002 3:15 pm

Audio Logic, Penrose.
Lou

Post by **zorruno** » Fri Oct 18, 2002 6:55 pm

is that the importer? Most car audio shops have it, or a similar brand
product such as roadkill, b-quiet, cascade. Expensive though for what you get
IMO

There are plenty of other bitumin based acoustic dampening products around for
the construction/HVAC industry that is a lot cheaper but not sold specifically
for car audio use. Places like Jaycar are a good place to start.

In saying that though, some of the cheaper products don't stretch well, or
don't stick well, so you sometimes need to add contact cement, or a little bit
more time to install.

I've used dynamat & roadkill brand (boot & gearbox area & parts of door
panels), and Dynamat's spray product (doors) on my last car (MX6), and also
used a cheaper product for the entire floor area. None was more difficult
than the other, but the spray was bl*$#@ expensive for the coverage, and
because the cheap stuff was just sitting on floor area, did not need to be
worked much.

Me? I'd probably spend my money & time elsewhere for an MX5 - I don't think
you'll be able you to hear to sound proof to enable you to hear exhaust noise
over course chip. I think that would take some serious acoustic analysis...

cheers
h&c&z

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