Exhausts and dB
Posted: Sat Nov 13, 2004 4:15 pmHi all,
I made an earlier post in another thread which discussed if anyone had problems with aftermarket exhaust systems, the amount of noise and the police. To bring this out a bit further into the discussion I thought I would post part two of my experiences in the general area so more people can be included.
Anyway to cut a long story short, I decided to change my stock exhaust on the Z1000 to a 4 into 1 Micron System. No problems whatsoever getting one and having it installed. Went to pick it up and noticed that it was loud but didn't really think much more of it.
What alerted me to the fact that it was LOUD was people turning around when I was going along the street and the fact that I couldn't hear much more in the traffic apart from my brain rattling because of the noise. This led me to do a little research about the law, exhausts and noise levels.
I searched the Transport sites and really found nothing. Then I was hooked up with a great block called Chris Coote. He knows his shit. Anyway just so everyone knows there is laws that govern exhaust noise in QLD and other states with NSW being the most strict in the country.
I hear you ask so what is the law?
Well no bike can be over 94dB at half rev's in a stationary position. This is all based on ADR (Australian Design Rule) your bike has been built under. For instance my Z1000 was built in ADR 39.
Mine happened to be 101dB. Which is a little over the top if anyone knows how dB are measured. For those who are interested you can look at this site. It gives a list of different measurements at Home, Work and Recreation.
So, I decided to drop the bike into a bunch of guys at Slacks Creek called the Motorcycle Exhaust Professionals and talked with Noel and Ivan. Excellent service and they really know the laws. So if you have done an aftermarket exhaust system I would suggest you get it checked out as the laws will be changing in January 2005 and the "word" is that the Police are going to start enforcing this on QLD roads after my discussions with Noel and Ivan. Now my exhaust sings (and still sounds great with smoother low down power) at a very legal 92.7dB and should I go to a track day etc I can put it back to the 101dB and "feel" it. The changes made to my Micron are removable should I ever need too via way of a baffle.
I hope this helps those who want to be "legal" in the true sense of the word.
Finally, some further information:
"Current levels enforced in Queensland are 94dB for bikes made on or after 1.3.1964, 96dB for bikes made between 1.7.1965 and 28.2.1984, and 100dB for bikes made before 1.7.1975. Car levels are 90dB for cars made on or after 1.1.1963 and 96dB for cars make before that date. Enforcement allows on 1 dB leeway for cars and 2dB leeway for motorbikes."
I made an earlier post in another thread which discussed if anyone had problems with aftermarket exhaust systems, the amount of noise and the police. To bring this out a bit further into the discussion I thought I would post part two of my experiences in the general area so more people can be included.
Anyway to cut a long story short, I decided to change my stock exhaust on the Z1000 to a 4 into 1 Micron System. No problems whatsoever getting one and having it installed. Went to pick it up and noticed that it was loud but didn't really think much more of it.
What alerted me to the fact that it was LOUD was people turning around when I was going along the street and the fact that I couldn't hear much more in the traffic apart from my brain rattling because of the noise. This led me to do a little research about the law, exhausts and noise levels.
I searched the Transport sites and really found nothing. Then I was hooked up with a great block called Chris Coote. He knows his shit. Anyway just so everyone knows there is laws that govern exhaust noise in QLD and other states with NSW being the most strict in the country.
I hear you ask so what is the law?
Well no bike can be over 94dB at half rev's in a stationary position. This is all based on ADR (Australian Design Rule) your bike has been built under. For instance my Z1000 was built in ADR 39.
Mine happened to be 101dB. Which is a little over the top if anyone knows how dB are measured. For those who are interested you can look at this site. It gives a list of different measurements at Home, Work and Recreation.
So, I decided to drop the bike into a bunch of guys at Slacks Creek called the Motorcycle Exhaust Professionals and talked with Noel and Ivan. Excellent service and they really know the laws. So if you have done an aftermarket exhaust system I would suggest you get it checked out as the laws will be changing in January 2005 and the "word" is that the Police are going to start enforcing this on QLD roads after my discussions with Noel and Ivan. Now my exhaust sings (and still sounds great with smoother low down power) at a very legal 92.7dB and should I go to a track day etc I can put it back to the 101dB and "feel" it. The changes made to my Micron are removable should I ever need too via way of a baffle.
I hope this helps those who want to be "legal" in the true sense of the word.
Finally, some further information:
"Current levels enforced in Queensland are 94dB for bikes made on or after 1.3.1964, 96dB for bikes made between 1.7.1965 and 28.2.1984, and 100dB for bikes made before 1.7.1975. Car levels are 90dB for cars made on or after 1.1.1963 and 96dB for cars make before that date. Enforcement allows on 1 dB leeway for cars and 2dB leeway for motorbikes."
