noisy exhausts

[JohnBoy]

i went through this last year when i brought a race system for my ZXR. basically they said that as long as your not giving it stink around town (or the fuzz) you should be sweet.

[White trash]

My F100 will set off every car alarm in a car-park building, - yet it is quiet enough to get a warrant or drive past a cop without them looking twice BECAUSE I know when I can 'boot-it' - without attracing unwanted attention.

Obviously car parking buildings are a good start.

[WINJA]

You're half right.

What's actually happening, is Labour have announced, as part of their election campaign, that all WOF checks on ay pasenger vehicle, would have to pass a noise test. The fines and demeit points are additions to this law if Labour is elected for a further term.

I've been watching the campaigns very closely (for once) and have 'till now, been undecided. Labour just shot themselves out of the running in my book.

Remember, this law will apply to EVERYONE, not just cars.

THEY NEED TO APPLY THIS LAW EVENLY INCLUDING BUSSES AND TRAINS , CAUSE FUCK THERE IS SOME VERY LOUD BUSSES IN AUCK .
ID VOTE FOR ANYONE BUT LABOUR AFTER HEARING THIS ANNOUNCEMENT BY LABOUR , US MOTORISTS HAVE BEEN SODOMISED ENOUGH

[Lou Girardin]

Nup, only worry about the price of the factory extras!!

Seriously, it is NOT how loud it is that causes the problem, it's how you use the vehicle.

My F100 will set off every car alarm in a car-park building, - yet it is quiet enough to get a warrant or drive past a cop without them looking twice BECAUSE I know when I can 'boot-it' - without attracing unwanted attention.

Halle-fucking-luya. Thank you Scumdog.
This is the reality about noise tickets folks, it's not how loud it is, it's how you use it.
(Disclaimer, this doesn't apply to Superdukes with Akrapovic systems)
They wake the dead at idle.

[sAsLEX]

The prbolem with noise tests, is that it is very dependent on the distance away from the exhaust, the angle between the outlet and the meter, the frequency, background noise and a whole pile of things.
it is hard to do right, and I wouldn't trust the apprentice or ex car dealer in the VTNZ station to do it properly.
Geoff

this is why there is already very strict and stingent standards about how to test vehicle noise, ok had they removed the legislation stating the standard to be achieved and replaced it with the GREY fuckin prhrase louder than when it left the factory!

Bugger, put that last post as a new thread... oh well

To ascertain how this 86dBA is measured you need to follow ISO 362 (practically identical to BS 3425).
There are conditions over 6 pages with all the details but these are the guts of it

-measurements shall be made in a level open area with no reflecting items (buildings, boulders, fences etc) within 50m.
-There shall be a minimum of 20metres square of ashphalt or similar road surface (that has to comply with ISO 10844... I did say it wouldn't be simple!) with a further minimum 10m stretch at either end (at least 3m wide) prior to entering the 20x20 area.
-The microphone is 7.5m away from the centreline in the middle of the 20x20 area
-4 measurements are made per side .. ie vehicle does at least 8 passes
-vehicle must be warmed up first
-As the bike approaches the 20x20m area it must be doing 50km/hr in 2nd and/or 3rd gear (if 5 forward gears or more are fitted). The bike then accelerates hard across the 20m and then the throttle is closed as the rear of the bike passes the 20m line
-if the engine RPM's exceed the maximum net power point, the test is done only in 3rd gear, otherwise both 2nd and 3rd are used
-minimum of 4 consecutive measurements must be done and be within 2 dB



and it goes on and on... (incidentally I do realise I'm the only one interested at this stage!)

ck explains the standard above that was in the regs, but instead they are just going to make their own as everyone knows that ISO regs are just crazy gibberish invented by monkeys.........

[inlinefour]

They are pretty quick to hand out tickets, but as stated earlier. If you have standard original exhaust you should be OK

[GN1NiteStnd]

My other half recently installed a loudmouth on my bike, I hope I dont get stung by this law!

And i heard that you can get a fine for accelerating to fast!
What next?

[vifferman]

just wondering though - what do people's factory stickers say? As you can see mine says 92db with an A weighting, which is actually pretty loud for a factory system! Of course the new system on it now is a tad louder.....

The FahrtSturm had it actually stamped into the top of each muffler (a whole bunch of words and crap) that said it was 92dbA. IIRC, the sticker I ripped off the VFR (the same as in your pic) was under 92, summat like 89 I think.
I recall reading that my current 'muffler' is around 106 or 107 without the restrictor. With the current one, it'd be over 100, and with the original one, I think it'd be less than 92.

[scumdog]

The sticker on the swing-arm of the SportsterEss says "93.5db at 2,600rpm."

Never realised swing-arms were that noisy!

I wonder how loud the 'zorst is???

[Wolf]

I don't think they'd care about us, unless they're having a really shit day, in which case, you could appeal against it..

The only time the cops cared about the noise my old TS was making was when it had a whacking great hole in the exhaust pipe (I was waiting for pay day to get a new muffler bandage). It was pretty loud with all the holes plugged but that day it was louder than normal (but nowhere near as loud as when I ripped the pipe right off the muffler) and I got warned for it, told to fix it promptly.

Other than that I never had any hassles and my mates used to put the jug on when they heard my bike approaching (it was boiled by the time I got there, which should tell you how loud the bike was normally.)

[Damon]

I tested my pipes this weekend and at an idle they pushed 104db, a quick twist sent it passed the machines 114db limit, but i've had no issues with the police so long as i dont punch it while they are in ear shot.

[vifferman]

I tested my pipes this weekend and at an idle they pushed 104db, a quick twist sent it passed the machines 114db limit, but i've had no issues with the police so long as i dont punch it while they are in ear shot.

What sort of cans do you have on the 'Storm, shawda?

[Wolf]

My other half recently installed a loudmouth on my bike, I hope I dont get stung by this law!

That'd depend on the "loudmouth" - if he decided to get smart with the cop you might have problems...

[TLDV8]

All i know is...A stock TL1000 header pipe with stock mufflers has little in common with a Full Yoshimura system noise wise.When i asked at the local LTSA,i was told no louder than stock,that would even go as far as not being able to fit a SS Commodore exhaust system to another Holden of the same basic body type...I was thinking of making some kind of reducer (like the Staintunes have) to restrict the noise for static tests and to also keep in the tail compartment if it ever got to the stage of roadside hassles....you can pussy foot around all you want to keep the Db's down in town,but once you get out on the open road and up to cruising RPM's,there is little you can do? let alone things like the packing wearing out on twins at a fairly fast rate.. ..A TL with a stock exhaust,its not right

[vifferman]

I was thinking of making some kind of reducer (like the Staintunes have) to restrict the noise for static tests and to also keep in the tail compartment if it ever got to the stage of roadside hassles

I did that for my VTR. After going to several muffler shops (including a m/cycle zorst place) to tell them what I needed, I gave up, drew up a sketch of what I needed, then took it to Woolf Mufflers and asked them to make two. Worked exactly as expected, and reduced the noise to a level where it wasn't enough to attract unwanted attention, but still had that nice v-twin rumble. Cost me ~$60 for the pair.
The Staintune 'spuds' are around $32 each, stainless steel, and come with an allen-headed screw and washers. I ordered a spare one after I got the bike, so I can run the Satantune without restrictor, with a cut-down one (which is what I run most of the time), or with a full one, which is pretty quiet.