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how to measure db? 

 

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 Post subject: how to measure db?
Posted: Wed Apr 28, 2010 7:02 pm 
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I need to measure to db coming out out the exhaust on my car.
What i need to know is how far back and on what angle.

thanks matt

 

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 Post subject: Re: how to measure db?
Posted: Wed Apr 28, 2010 7:08 pm 
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about 1 metre back and off 45 degrees.....max allowed is 86db

 

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 Post subject: Re: how to measure db?
Posted: Wed Apr 28, 2010 7:09 pm 
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Take it to the Muffler man at Kingswood. He will do it and issue a certificate.
Costs $80 from memory for a test with certificate.
I think you do have to book with him but.

 

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 Post subject: Re: how to measure db?
Posted: Wed Apr 28, 2010 7:11 pm 
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Get an Iphone and download the DB meter app
Brett

 

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 Post subject: Re: how to measure db?
Posted: Wed Apr 28, 2010 7:21 pm 
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Quote:
Costs $80 from memory


ouch, it takes like one minute....iv had one done

rev it 3 times to 3000rpm and look at the meter....i scored 84

 

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 Post subject: Re: how to measure db?
Posted: Wed Apr 28, 2010 7:25 pm 
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:shock: better quieten my Ghias exhaust then... last time i had it on the dB meter it was 96 :twisted:

 

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 Post subject: Re: how to measure db?
Posted: Wed Apr 28, 2010 7:29 pm 
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DormanAU wrote:
about 1 metre back and off 45 degrees.....max allowed is 86db


thank yopu very much is it 45 degrees up or to the side

 

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 Post subject: Re: how to measure db?
Posted: Wed Apr 28, 2010 7:32 pm 
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to the side....and clear air dehind

 

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 Post subject: Re: how to measure db?
Posted: Wed Apr 28, 2010 7:36 pm 
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according to my engineer cert its measured at 1550 mm at a 45 deg angle directly behind the exhaust..
the legal limit is 90 db.

the tests are measured..
4 cyl= @4000rpm
6 cyl= @3200rpm
v8 = @3300rpm
and rotory =@4500rpm
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 Post subject: Re: how to measure db?
Posted: Wed Apr 28, 2010 7:40 pm 
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155mm or cm? it goes on the age of the car the db. i was told i was allowed 86....iv got some more work to do...although i have changed my pipes :shock:

 

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 Post subject: Re: how to measure db?
Posted: Wed Apr 28, 2010 7:48 pm 
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DormanAU wrote:
155mm or cm? it goes on the age of the car the db. i was told i was allowed 86....iv got some more work to do...although i have changed my pipes :shock:


155cm..
my ed was done in sept last year, and in nsw its 90db max..
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 Post subject: Re: how to measure db?
Posted: Wed Apr 28, 2010 7:52 pm 
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Quote:
and in nsw its 90db max..



we both could be right, im in vic...bugger.....how did your ed do?

 

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Au factory 5sp, rolling on 20'z, full custom extractors, redback cat and back. has a new motors, only 27,000ks

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 Post subject: Re: how to measure db?
Posted: Wed Apr 28, 2010 8:13 pm 
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DormanAU wrote:
Quote:
and in nsw its 90db max..



we both could be right, im in vic...bugger.....how did your ed do?


it was knocked back at first..it was 94db.. had to fit another resinator hotdog...
ride height was too low, had to raise the rear..
and my blowoff valve wasnt plumbed back. added a hose..lol

the engineer that did mine does act and vic aswell..
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 Post subject: Re: how to measure db?
Posted: Wed Apr 28, 2010 8:21 pm 
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its like a really expensive roadworthy.

 

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Au factory 5sp, rolling on 20'z, full custom extractors, redback cat and back. has a new motors, only 27,000ks

Welcome to Toongabbie motorsports :P

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 Post subject: Re: how to measure db?
Posted: Wed Apr 28, 2010 8:26 pm 
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DormanAU wrote:
its like a really expensive roadworthy.


$800 just for the engineer report..
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