I've finally got my hands on a sound pressure doobrie, and can only remember things like "45 degrees" and "a metre from the exhaust" etc.Measuring the dB of exhausts
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Sidewinder
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Measuring the dB of exhausts
I know it's an oldie question, but can anyone remind me as to how this is done, please? I've finally got my hands on a sound pressure doobrie, and can only remember things like "45 degrees" and "a metre from the exhaust" etc.
I've finally got my hands on a sound pressure doobrie, and can only remember things like "45 degrees" and "a metre from the exhaust" etc.Mk2 NA Rev1 -*- Mk2 Turbo Rev2 -*- Mk1 NA -*- Mk2 Turbo Rev 3 = all gone!
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"Cruisey, Sporty, more innovation, more adult. A Man In Dandism. Powered mid-ship specialty."
-*- Mk2 Turbo Rev2 -*- Mk1 NA -*- Mk2 Turbo Rev 3 = all gone!_______________________________________
"Cruisey, Sporty, more innovation, more adult. A Man In Dandism. Powered mid-ship specialty."Re: Measuring the dB of exhausts
4500rpm
'02 VX220 2.2 n/a Daily driver - Exige Size TD 1.2 - TAT shorty Diffuser - HardTop - Chris Tullet 4-1 Manifold.'97 mk1 Mazda Eunos Turbo track car with 260bhp/ton - soon more as Chris Wilsons going to build me an engine over the winter 
) .Re: Measuring the dB of exhausts
From Bookatrack...
"0.5m, 45° from exhaust 3/4 max RPM"
Have fun 
.."0.5m, 45° from exhaust 3/4 max RPM"Have fun
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Lauren
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Re: Measuring the dB of exhausts
easy way to do it is simply to get a bit of wood and place the noise meter 0.5m along it. Just tape it to the wood then you can easily repeat a 0.5m distance.
Just tape it to the wood then you can easily repeat a 0.5m distance.-
Sidewinder
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Re: Measuring the dB of exhausts
Excellent - thanks very much all! 
- thanks very much all! Mk2 NA Rev1 -*- Mk2 Turbo Rev2 -*- Mk1 NA -*- Mk2 Turbo Rev 3 = all gone!
_______________________________________
"Cruisey, Sporty, more innovation, more adult. A Man In Dandism. Powered mid-ship specialty."
-*- Mk2 Turbo Rev2 -*- Mk1 NA -*- Mk2 Turbo Rev 3 = all gone!_______________________________________
"Cruisey, Sporty, more innovation, more adult. A Man In Dandism. Powered mid-ship specialty."Re: Measuring the dB of exhausts
Also - check the measurement scale you're using on the meter corresponds to the one you want to use to measure the sound levels.
Just curious, which exhaust are you measuring?
FWIW the standard Rev2 one is 96 or so dB(A?)
- check the measurement scale you're using on the meter corresponds to the one you want to use to measure the sound levels.Just curious, which exhaust are you measuring?
FWIW the standard Rev2 one is 96 or so dB(A?)
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Sidewinder
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Re: Measuring the dB of exhausts
BenF wrote:Just curious, which exhaust are you measuring?
Absolutely no idea.
I never got round to asking Patrick when I bought the car off him! Single exit, large bore, no markings on it
(apart from a Jasma sticker). My car-enthusiast chums reckon it's loud, but I've heard much louder exhausts at JAE from MR2s.A crap picture of the back-end of the motor, but the best shot I have:
Mk2 NA Rev1 -*- Mk2 Turbo Rev2 -*- Mk1 NA -*- Mk2 Turbo Rev 3 = all gone!
_______________________________________
"Cruisey, Sporty, more innovation, more adult. A Man In Dandism. Powered mid-ship specialty."
-*- Mk2 Turbo Rev2 -*- Mk1 NA -*- Mk2 Turbo Rev 3 = all gone!_______________________________________
"Cruisey, Sporty, more innovation, more adult. A Man In Dandism. Powered mid-ship specialty."-
Lauren
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Re: Measuring the dB of exhausts
Nige wrote:BenF wrote:Just curious, which exhaust are you measuring?
Absolutely no idea.
Single exit, large bore, no markings on it
A crap picture of the back-end of the motor, but the best shot I have:
Doesn't a
'Jasma' marking represent that it conforms to Jap noise regs of 98db? mind you if you are catless that will make a difference i guess