db for exhaust
 

where is perth can i get the db reading for my exhaust ?
just in case the boys in blue pull me over

At the pits. I had the db reading written down on my permit for the exhaust too, alongside the max legal limit.

on this subject what is the db limit for an exhaust in perth :confused:

Without trudging through the VSR's online, I believe the legal limit to be 90dB for cars... higher for bikes, trucks etc.

yer 90db is correct. when i had my mazda turbo the boys in blue told me it sounded too loud, so i went to the pits and they tested it and i got 35db.. a long way off illegal... good to get a permit tho..

If you take your car into the "pits" for an exhaust db reading, and it comes back higher than legal, are there any issues? ie. are they going to sticker you right there?

Permits are just get tested, pay money (approx $35 ??), get piece of paper and drive away huh?

how do they test the db? Ne1 had this done b4. Like wat meter how far do they put the mic from the zorst. Is it free air or do they do it in a room?

[font=Arial,Helvetica,Geneva,Swiss,SunSans-Regular]Many statutory bodies around the world currently mandate that vehicles comply with stationary exhaust noise tests specifications - Generally based upon the "SAE J1169 Measurement of Light Vehicle Exhaust Sound Level under Stationary Conditions"[/font] [font=Arial,Helvetica,Geneva,Swiss,SunSans-Regular]For example, California and various other states in the US mandate J1169 SAE stationary noise tests. In Australia the test requirements are ADR 28/01 stationary noise test and it too is based upon SAE J1169. In fact, the above tests have identical test procedures and only the required limit varies:[/font]

[font=Arial,Helvetica,Geneva,Swiss,SunSans-Regular]The test involves positioning a type 1, SIA compliant ANSI S1.4 - 1983 noise level meter, specifically as illustrated in the diagram below. No other positioning is relevant! Noise tests are extremely specific in their scope and must be conducted very carefully![/font]

[img]http://www.airpowersystems.com.au/us_spec/subaru/exhausts/noise_test.gif[/img]
[font=Arial,Helvetica,Geneva,Swiss,SunSans-Regular]
[/font]
[font=Arial,Helvetica,Geneva,Swiss,SunSans-Regular]Engine RPM must be held steady at 75% of rated peak horsepower RPM.[/font]

[font=Arial,Helvetica,Geneva,Swiss,SunSans-Regular]Given the latter figure is 6,000 RPM for the [b]US spec.
WRX/STI[/b], the test speed is [b]4,500 RPM[/b] for these vehicles.[/font]

[font=Arial,Helvetica,Geneva,Swiss,SunSans-Regular]Again, it must be emphasised, all facets of a noise test must be specifically followed for the test to have any meaning.
[/font]

[font=Arial,Helvetica,Geneva,Swiss,SunSans-Regular]


All info stolen from : [url="http://www.airpowersystems.com.au"]http://www.airpowersystems.com.au[/url]
Dunno if it is still current,,,
[/font]

DB limit actually varies from car to car, the guy at Welshpool showed me this very thick book of DB limits for various cars. Now this was 3+ years ago, I can't remember but I think the DB limit for a 99/00 WRX was 91 DB.

91/92db sounds correct. Last time i was given the test at Warwick pits i was tested from about 1-2m away at 1,500rpm, 2,500rpm and 3,000rpm (supposed to be 3,500rpm but no one was watching so i didnt go that high!)

Over 2.5K rpm my car was illegal (102db) and i was told that "given you have no cat, i'd suggest you keep it under 2.5k so we dont see you again" :D I have a DB meter on my phone (how accurate it is, i dont know) but the new exhaust is much louder...

i got a different story with this. when i got my permits i asked them to put my exhaust in the list along with all the other mods. the guy at welshpool pits said that he can't include exhaust & bov. apparently, and i quote, "as long as its not noisy its ok." when i ask him how do you define noisy and not noisy, he said its up to the inspector.

i reckon he's just lazy.

I have been twice to the guy at whelspool and he didnt even check my car i asked for permits for Pillar guages and FMIC and Exhuast and Lowered springs. he just wrote them down and said done.. no worries.. though this time i took a copy of my old permits he did on last car and asked for same again..

some ppl are more lucky than others i guess... same thing happened to my friend. took his sti there and got permits for everything without having to look at the car

Sureley someone like narchi would have one, I think it's measured by putting the meter 1m behind & 3m across from the exhaust outlet.

i dont own one but i can arrange it for anyone if you wanna see. By the sounds of it tho is a diff microphone and measuring device then the mics u use for spl.

so permits def a good idea? and welshpool seems the place to go?
If u go in to get permits and ur car doesnt pass. Do you get a yellow? is it a gamble

[QUOTE=Narchi]
so permits def a good idea? and welshpool seems the place to go?
If u go in to get permits and ur car doesnt pass. Do you get a yellow? is it a gamble[/QUOTE]

I dont think permits are all that good as my last two experiences have proven they are a waste of money (esp with other illegal / defectable mods on your car). If you can get a permit for something, then clearly it must be legal, so therefore constable care shouldnt be allowed to defect your car...

Surely there isnt much point spending $40 on permits for your gauges / strut brace and POD filter when the police have pulled you over for running antilag or showing the people on the Cappo strip what your BOV sounds like.

Although theres a few grumpy old men at Warwick pits, most of them are helpfull. Especially the young bloke working there. They said that they will try and permit all legal mods but they wont cause yoy grief unless your car is clearly dangerous / illegal.

trust me mate, $30 for a permit is a perfectly good investment. of course, if ur caught displaying ur antilag then ur screwed. but i'm sure i'm not the only one who had been asked to pull over during rbt even though u registered 0 bac, then u hear those magic words: Pop the bonnet please sir

Hmm only thing i keep getting checked up about is my ride height. Everytime im pulled up, a police officer pulls out the torch. Sometimes this can waste up to 5-10mins of my time. Id rather just pull out a permit and say its all good. BUt then i dont wanna have to get permits for all the other stuff i got on. Coz u pay per permit dont ya.

yeah but that 30 bucks will include everything. of course additional items at later date will cost another 30. basicly its 30 bucks per inspection. minimum legal ride height is 10mm fully laden.

u mean 100mm lol. And i didnt realise it was with weight. Mine sits at 98 mm with no1 int he car. Crap. I think ill just get permits wen i get a yellow.

oops hahahaha yeah 100 mm. U can get ur permits for everything else. the guy will just leave ur suspension off the list.

ok but he cant make me raise it.

hmm
dun think so :)

Cool i might have to go get some permits then.