Notice: We request that you don't just set up a new account at this time if you are a previous user.
If you used to be one of our moderators, please feel free to reach out to Chris via the facebook Outerlimits4x4 group and he will get you set back up with access should he need you.
Recovery:If you cannot access your old email address and don't remember your password, please click here to log a change of email address so you can do a password reset.

exhaust

Tech Talk for Suzuki owners.

Moderators: lay80n, sierrajim

Forum rules
Post Reply
Posts: 215
Joined: Mon Mar 24, 2008 12:43 pm
Location: Mid Nth Coast

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
Top
Posts: 5714
Joined: Fri Nov 22, 2002 3:55 pm
Location: Perth WA.

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]
U SUK Zook Built and Sold.
New rig is 97 80 DX. 2" list 33s
Top
User avatar
lay80n
God Of Emo
Posts: 7350
Joined: Sun Aug 24, 2003 7:04 pm
Location: Newy, home of the ZOOK (Rockin the 'diff)

Contact:
Contact lay80n

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]
Top
Posts: 7345
Joined: Wed Jun 02, 2004 3:29 pm
Location: Melbourne

Contact:
Contact Gwagensteve

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]
Top
Posts: 3940
Joined: Wed Dec 27, 2006 1:09 pm
Location: Sunshine Coast Qld

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
Top
Posts: 7345
Joined: Wed Jun 02, 2004 3:29 pm
Location: Melbourne

Contact:
Contact Gwagensteve

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]
Top
Posts: 7345
Joined: Wed Jun 02, 2004 3:29 pm
Location: Melbourne

Contact:
Contact Gwagensteve

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...

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]
Top
Posts: 1791
Joined: Fri Aug 24, 2007 3:02 pm
Location: Kurrajong Heights, NSW

Post by BlueSuzy »

OWNED again, Double post Gwagensteve :finger:
I am Tim
Top
Posts: 7345
Joined: Wed Jun 02, 2004 3:29 pm
Location: Melbourne

Contact:
Contact Gwagensteve

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
[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]
Top
Posts: 3940
Joined: Wed Dec 27, 2006 1:09 pm
Location: Sunshine Coast Qld

Post by want33s »

I was sure it was only 3Db........
OK Steve we'll let you get away with a doublepost THIS time.... :rofl:
Jas.
Top
Posts: 445
Joined: Mon Feb 11, 2008 9:54 pm
Location: Perth

Post by PCRman »

so we are agreed 10dB = double perceived loudness?
Top
Posts: 5714
Joined: Fri Nov 22, 2002 3:55 pm
Location: Perth WA.

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]
U SUK Zook Built and Sold.
New rig is 97 80 DX. 2" list 33s
Top
Posts: 445
Joined: Mon Feb 11, 2008 9:54 pm
Location: Perth

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
Top
Posts: 5714
Joined: Fri Nov 22, 2002 3:55 pm
Location: Perth WA.

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
Top
Post Reply

Return to “Suzuki”

Who is online

Users browsing this forum: No registered users and 3 guests