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exhaust

Tech Talk for Suzuki owners.

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exhaust

Post by DavePatrol »

my mates sirrra has a 2 inch straigt thro with just a hotdog and we did a dbs reading at tafe and it got 120dbs at 4000rpm and only went up 3 when reved to 7000rpm
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Re: exhourst

Post by nicbeer »

DavePatrol wrote:my mates sirrra has a 2 inch straigt thro with just a hotdog and we did a dbs reading at tafe and it got 120dbs at 4000rpm and only went up 3 when reved to 7000rpm
umm, u clicked the wrong button.

also 3db = twice as loud.
[url=http://www.outerlimits4x4.com/viewtopic.php?p=930942#930942&highlight=]Zook[/url]
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Post by lay80n »

Lucky the legal limit is 90db too. So with 3-4db being double the noise level, thats real legal.

Oh, and as nick said, try hitting reply, not new post.

Layto....
[quote="v840"]Just between me and you, I actually really dig the Megatwon, but if anyone asks, I'm going to shitcan it as much as possible! :D[/quote]
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Post by Gwagensteve »

Ahem, just to introduce some tech, 6dB is actually double.

120db is insane. Like I said int he other exhaust thread, a hot dog doesn't really drop the noise at all.

Steve.
[quote="greg"] some say he is a man without happy dreams, or that he sees silver linings on clouds and wonders why they are not platinum... all we know, is he's called the stevie.[/quote]
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Post by want33s »

Gwagensteve wrote:Ahem, just to introduce some tech, 6dB is actually double.

Steve.
How does that work Steve?
http://www.phys.unsw.edu.au/jw/dB.html
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Post by Gwagensteve »

oops - doubleowned. :oops:


Steve.
Last edited by Gwagensteve on Thu Jul 17, 2008 10:18 pm, edited 1 time in total.
[quote="greg"] some say he is a man without happy dreams, or that he sees silver linings on clouds and wonders why they are not platinum... all we know, is he's called the stevie.[/quote]
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Post by Gwagensteve »

oops - owned. :oops:

I'm used to working in ultrasonics where we display sound waves 1/2 wave rectified, so imagine the waveforms displayed on the UNSW page but with the bottom 1/2 removed. In 1/2 wave recitifed signals, to double the signal height takes 6dB.

Sorry...

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[quote="greg"] some say he is a man without happy dreams, or that he sees silver linings on clouds and wonders why they are not platinum... all we know, is he's called the stevie.[/quote]
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Post by BlueSuzy »

OWNED again, Double post Gwagensteve :finger:
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Post by Gwagensteve »

If you were working on a wireless connection as slow as I'm on atm you'd be doubleposting too. :bad-words:

Steve
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Post by want33s »

I was sure it was only 3Db........
OK Steve we'll let you get away with a doublepost THIS time.... :rofl:
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Post by PCRman »

so we are agreed 10dB = double perceived loudness?
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Post by nicbeer »

PCRman wrote:so we are agreed 10dB = double perceived loudness?
every 3db = twice as loud technically.
[url=http://www.outerlimits4x4.com/viewtopic.php?p=930942#930942&highlight=]Zook[/url]
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Post by PCRman »

nicbeer wrote:
PCRman wrote:so we are agreed 10dB = double perceived loudness?
every 3db = twice as loud technically.
Sorry i disagree

3dB = twice as acoustically powerful or twice the sound insensity level (technically)
as defined in the graph here
http://www.phys.unsw.edu.au/jw/dB.html
Image

loudness is by definition subjective and
"Experimentally it was found that a 10 dB increase in sound level corresponds approximately to a perceived doubling of loudness. "

so it takes 10 times the power to double the loudness

references

Fletcher, H. and Munson, W.A. (1933) J.Acoust.Soc.Am. 6:59
Robinson, D.W. and Dadson, R.S.(1956) Br. J. Appl. Phys. 7:166
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Post by nicbeer »

ahh thx. one way to add tech :lol:

we were both correct he he
[url=http://www.outerlimits4x4.com/viewtopic.php?p=930942#930942&highlight=]Zook[/url]
U SUK Zook Built and Sold.
New rig is 97 80 DX. 2" list 33s
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