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The Bar For non Automotive Related Chat |
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#1 | ||
White Lightning
Join Date: Dec 2004
Posts: 1,870
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a mate of mine works at an electronics shop and has agreed to let me decibel test my new exhaust with their awesome gear. what i would like to know is the proper police testing methods so i can get it right and see if i need to make it legal. i know there's a certain distance and angle it has to be on, not just shove the mic in the pipe.
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#2 | ||
Banned
Join Date: Feb 2005
Posts: 1,750
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Bring it around to my place,
Add 1 carton Tooheys New 30 pack Cans Consume Cans Let Cans settle for 1/2 hour Get in car and rev the sh1t out of it for 3 minutes If the bible bashers next door dont turn on their lights, it can be louder.... |
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#3 | ||
Mopar/No Car
Join Date: Jan 2005
Location: Down the Obi..
Posts: 4,648
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rpm equal to 2/3rds of where peak power is made (i.e. if peak power is at 15,000rpm (yours is. trust me.), then it's tested at 10,000rpm). The mic is 6 feet from the tip of the pipe , on an angle away from the car (i.e. if the pipe is on the RHS, it's 6 feet diagonally to the right of the pipe).
90% sure that's correct.
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ColumnShift Media '72 Plymouth Scamp '80 Courier '13 Kawasaki ZX14-R '13 Berlina '92 Suzuki DR650 If you don't fight - You lose
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#4 | ||
White Lightning
Join Date: Dec 2004
Posts: 1,870
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sounds like a plan. anyone actually know the legal limit on cars? 88 and 90db ring bells in my head. never had to worry about all this with the super-mega-50 mufflers and a blocked cat system that was on there.
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#5 | ||
they call me Tibbo
Join Date: Dec 2004
Location: Brisbane
Posts: 6,163
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the guys were testing some new gear at Zillmere mainroads one day and I asked them what it was.. It was the new tester... It is a foot by foot triangle on a foot tall tripod with the mic on it.. hard to explain but it is a foot away from the tail-pipe on a 45 degree angle and a foot off the ground
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#6 | ||
Boost Addict
Join Date: Jan 2005
Location: North Brisbane
Posts: 1,151
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45degree angle and 1m away toards the opposite end of the car from where the exhaust is located (ie exhaust is on RHS, device i head at 45 degree horizontal and 1m away and same distance off ground as exhaust pipe towards LHS). RPM = 2/3 of max rpm, ie max rpm at 6000rpm = tested at 4000
thats how the cops showed me when i asked them to explain it to me
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N12 Pulsar - sold Gen1 Liberty Turbo - sold VP Commodore Turbo - sold LN65 Hilux Turbo - sold EL31 Corolla Turbo - sold Ford AU Ute Turbo - sold Ford AU XR8 Sedan - 5.4l V8 Turbo (in the build) Ford BA XR6T Ute - daily driver Ford FG XR6T Sedan - cruiser do you see a general trend? I DO ![]() Can't live with it, can't live without it! |
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#7 | |||
FF.Com.Au Hardcore
Join Date: Jan 2005
Location: Is that your face, or did you neck throw up
Posts: 3,041
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Quote:
mic is 6 ft to the side of your car at a 20 deg angle back. (i.e. if the pipe is on the RHS, it's 6 feet diagonally to the right of the pipe angled back 20 deg). if you have a pipe coming out on both side of your car (like new GT) you will have to conduct the test twice. Once on each side of your car.... An interesting note. When testing you do not take into account the back off gurgle you exhaust make when you get of the peddle..... |
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#8 | ||||
Grinder+Welder = Race car
Join Date: Jan 2005
Location: Briz-Vegas
Posts: 3,937
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Quote:
Quote:
Anyone 100% on the sound limits? bikes 96db(a)? Pre 90 something cars 92db(a)? newer 88db(a)?
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"No, it will never have enough power until I can spin the wheels at the end of the straightaway in high gear" - Too much power is never enough....Mark Donohue on the Can Am Porsche 917. |
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