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Author Subject: noise level
Rix13

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Registered: 06 Oct 2011

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Post #1
What angel and distance do noise levels get done at for exhausts. I know it's done at 3.5k and that's bout it, just thinking if I look at track days would be an idea to know how loud mine is to be on safe side. Got a decibel meter kicking about.

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Posted 5th Sep 2012 at 22:35
eliotrw

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Post #2
Think its like 45 degrees and 1.5m? Someone will cotrect me tho

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Posted 5th Sep 2012 at 22:54
welshpug!

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Post #3
Its not 3.5k, its 3/4 rpm

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Posted 6th Sep 2012 at 07:47
braymond

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Post #4
^^ What he said. And its usually 1m

Not sure what angel they use though. Mines always been done by a unicorn..

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Posted 6th Sep 2012 at 09:45
stan_306gti6 Forum Admin

Location: Kent

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Post #5
3/4 rpm, 45 degrees from the tailpipe at 1m. Yes

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Posted 6th Sep 2012 at 21:24
stan_306gti6 Forum Admin

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Post #6
And just in case you were wondering, my current setup read 131dB when using this method... Shock LOL

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Peugeot 306 GTi-6
2000 (X), Moonstone Love
Posted 6th Sep 2012 at 21:24
swiftyboi006

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Post #7
Do you wear ear defenders lol

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Posted 12th Sep 2012 at 18:33
Chris28190

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Post #8
stan_306gti6 wrote:
And just in case you were wondering, my current setup read 131dB when using this method... Shock LOL


Do you not get pulled over for your car being too loud? Haha that's insane for road use.

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Posted 12th Sep 2012 at 20:49
armzsc6

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Post #9
Is that just at fast idle rather than full throttle to that speed etc?

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Posted 12th Sep 2012 at 22:53
ballardpaul

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Post #10
Chris28190 wrote:
stan_306gti6 wrote:
And just in case you were wondering, my current setup read 131dB when using this method... Shock LOL


Do you not get pulled over for your car being too loud? Haha that's insane for road use.


He might do if he ever drove it...

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Posted 12th Sep 2012 at 23:01
owain

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Post #11
Two things to consider if you think you might be near the limit:

1) Cheap noise meters are crap, just because it's under on yours doesn't mean you'll pass

2) Just because you scrape a noise test in the pits doesn't mean they won't ban you if you're too loud on track. This more tends to be the case with turbo cars which are off boost when doing a noise test but then unleash 140db of ungodly fury when you give it some on track.

Unless you're running super high boost there's no need for an exhaust to be so loud it fails a test, putting a sensible exhaust on will save you a fortune in wasted track days.

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Posted 13th Sep 2012 at 07:15
stan_306gti6 Forum Admin

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Post #12
armzs16 wrote:
Is that just at fast idle rather than full throttle to that speed etc?


That is using the method above, 45 degree angle from the tailpipe at 1 metre using 3/4 revs. Yes

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Peugeot 306 GTi-6
2000 (X), Moonstone Love
Posted 13th Sep 2012 at 11:41
stan_306gti6 Forum Admin

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Post #13
ballardpaul wrote:
Chris28190 wrote:
stan_306gti6 wrote:
And just in case you were wondering, my current setup read 131dB when using this method... Shock LOL


Do you not get pulled over for your car being too loud? Haha that's insane for road use.


He might do if he ever drove it...


LOL

It will get driven one day I promise...Yes

________________________________________

"Supercharged - 454.1bhp/317.5lb/ft"
Peugeot 306 GTi-6
2000 (X), Moonstone Love
Posted 13th Sep 2012 at 11:42
Chris28190

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Post #14
stan_306gti6 wrote:
ballardpaul wrote:
Chris28190 wrote:
stan_306gti6 wrote:
And just in case you were wondering, my current setup read 131dB when using this method... Shock LOL


Do you not get pulled over for your car being too loud? Haha that's insane for road use.


He might do if he ever drove it...


LOL

It will get driven one day I promise...Yes


When you sell it onto someone else maybe? LOL

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Cherry Rallye '99 - Sold
Posted 13th Sep 2012 at 11:46
stan_306gti6 Forum Admin

Location: Kent

Registered: 18 Jan 2004

Posts: 21,768

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Post #15
No, I will drive it again when I get round to it...LOL

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"Supercharged - 454.1bhp/317.5lb/ft"
Peugeot 306 GTi-6
2000 (X), Moonstone Love
Posted 13th Sep 2012 at 11:47
eliotrw

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Post #16
Its scrap tbh.
5k?

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Ex- Phase 3 China GTi-6 T-Reg
Posted 14th Sep 2012 at 09:30
stan_306gti6 Forum Admin

Location: Kent

Registered: 18 Jan 2004

Posts: 21,768

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Post #17
eliotrw wrote:
Its scrap tbh.
5k?


LOL

Bloody cheek!

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"Supercharged - 454.1bhp/317.5lb/ft"
Peugeot 306 GTi-6
2000 (X), Moonstone Love
Posted 14th Sep 2012 at 10:37
prism7guy

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Post #18
Just had a pdf sent through from Javelin for a trackday i'm doing next week at Anglesey.

"Compulsory Noise Testing:
All Cars will be required to not exceed a maximum sound emissions test of 105dBs. This is measured at a ¾ of max revs @1/2 metre from each exhaust outlet. Cars will be noise tested prior to joining the circuit."

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Goldie the track car.
Posted 14th Sep 2012 at 17:04
owain

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Location: Essex

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Post #19
Yeah but it's Javelin, so they won't care as long as you don't take the p**s Yes

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Posted 14th Sep 2012 at 17:07
stan_306gti6 Forum Admin

Location: Kent

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Post #20
I stand corrected, it IS 1/2 metre not 1m. Doh

Anyway, yes most circuits have the same limit of 105dB, except Brands Hatch GP which is 101dB.

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"Supercharged - 454.1bhp/317.5lb/ft"
Peugeot 306 GTi-6
2000 (X), Moonstone Love
Posted 15th Sep 2012 at 10:00
tvrfan007

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Post #21
f**k a duck, 131 db?

Good luck with your hearing in later life. Yes

There are a few 98db's kicking about too so always read your trackday label. Yes

Turbos were easy for passing the noise test. Sad

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Posted 15th Sep 2012 at 11:49
prism7guy

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Post #22
tvrfan007 wrote:
Good luck with your hearing in later life.


What?

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Goldie the track car.
Posted 15th Sep 2012 at 12:54
stan_306gti6 Forum Admin

Location: Kent

Registered: 18 Jan 2004

Posts: 21,768

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Post #23
prism7guy wrote:
tvrfan007 wrote:
Good luck with your hearing in later life.


What?


LOL

________________________________________

"Supercharged - 454.1bhp/317.5lb/ft"
Peugeot 306 GTi-6
2000 (X), Moonstone Love
Posted 15th Sep 2012 at 18:44
eliotrw

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Post #24
how loud is a typical decated low boost with a magnex 3inch or jetex etc anyone know?

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Ex- Phase 3 China GTi-6 T-Reg
Posted 17th Sep 2012 at 23:44
ballardpaul

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Post #25
With a magnex bloody loud. Mine was, it's louder than my super high boost. Didn't have a centre box though...

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Phase 3 Supercharged Diablo GTi 6 (443 BHP)Sold
Nissan 350Z (300 BHP)
Posted 18th Sep 2012 at 11:08

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