Noise limits?

[Shaun]

What is the limit in NZ for race bikes?

[codgyoleracer]

What is the limit in NZ for race bikes?

Slightly quieter than how loud ive seen you making a point to officials on occassions in the past ..... :-) :wari:

[Nasty]

10-6-3 of the mnz rules


10-6-3 Noise: Some venues may have specific noise level limits. These if included in supplementary regulations may overrule rule 10-6-1.

10-6-3-1 Noise Emmission Road Racing
All Road Racing Events on Permitted Circuits (Teretonga, Levels, Ruapuna, Manfield, Taupo, Pukekohe, Hampton Downs as of this point) the noise limit is 95dBA.

All machines are to be effectively silenced so as not to exceed 95dBA “ride by”, measured by the official meter mounted 30 meters from the track centre line, at the position on the circuit nominated by the circuit owners/managers. Machines registering readings consistently in excess of this limit will be brought to the attention of the officials for action to be taken as follows:
Exceeding 95dBA but not exceeding 98dBA: On the first offence during the meeting, the rider will be warned that this has occurred and instructed to rectify the meeting, the rider will be warned that this has occurred and instructed to rectify the situation. For the second 54 and subsequent infringements, the machine/rider will be Black Flagged from the practice
or race without further warning. If circumstances do not allow the machine to be Black Flagged, the competitor will be excluded from the results of that practice or race.

At all Street Circuits machines must operate as per the conditions (if any) listed in the local Councils resource consent for the event. Should these conditions require special procedures and/or testing at the event, then these must be listed in the Supplementary Regulations.

For special demonstration races/displays exemptions may be applied for, local council resource consent forms must be attached.

[Shaun]

10-6-3 of the mnz rules



Thanks mate

[James Deuce]

So stock GSXR750s are illegal?

[Shorty_925]

What is a ''ride by''....? Someone going past at their normal speed and rev's or someone going slow to get through testing....?

[Shaun]

Slightly quieter than how loud ive seen you making a point to officials on occassions in the past ..... :-) :wari:



Guilty as charged

[GSVR]

What is a ''ride by''....? Someone going past at their normal speed and rev's or someone going slow to get through testing....?

Sound meter testing I have witnessed the meter is beside a fast part of the track where bikes will be tapped out. (Is anyonne going to ride slow in qualifying or racing to pass the meter dB requirements?)

[Shorty_925]

Sound meter testing I have witnessed the meter is beside a fast part of the track where bikes will be tapped out. (Is anyonne going to ride slow in qualifying or racing to pass the meter dB requirements?)

When you say beside the track, is that beside the track from a distance of 30 metres?

[roadracingoldfart]

Sound meter testing I have witnessed the meter is beside a fast part of the track where bikes will be tapped out. (Is anyonne going to ride slow in qualifying or racing to pass the meter dB requirements?)


Shit yeah , just follow a Ducati and the metre reader think its him makin all the racket . :sweatdrop:yes::innocent:

[lostinflyz]

its at 30m and 95db is crazy loud. its usually at a point where your at full noise and the exhaust roughly faces the hill at least when i see the db man about.

i have ridden my 400 over that volume with 2 straight through cans (only 150mm long), no packing peaked at 97db at 30m at both timaru and ruapuna. If your bike doesn't attract the entire pits too it when it starts its unlikely to be over.

i rode that day at 2/3 throttle through the wee kinky bit at levels to get round the sound man. only took a faction of my times that day. The sound guys often leave after the morning race so you can go back to making as much noise as you like.

[Wingnut]

its at 30m and 95db is crazy loud. its usually at a point where your at full noise and the exhaust roughly faces the hill at least when i see the db man about.

i have ridden my 400 over that volume with 2 straight through cans (only 150mm long), no packing peaked at 97db at 30m at both timaru and ruapuna. If your bike doesn't attract the entire pits too it when it starts its unlikely to be over.

i rode that day at 2/3 throttle through the wee kinky bit at levels to get round the sound man. only took a faction of my times that day. The sound guys often leave after the morning race so you can go back to making as much noise as you like.


That was last year eh. I recall at levels - that was super loud!

[Corse1]

How bad is this? I was just going to book a trackday at Puke, but then noticed the strict enforcement of the 95db limit. I have no way to quieten a 999s with Termi's.

[jellywrestler]

How bad is this? I was just going to book a trackday at Puke, but then noticed the strict enforcement of the 95db limit. I have no way to quieten a 999s with Termi's.

yes you have, ride it at 3/4 throttle

[AllanB]

How bad is this? I was just going to book a trackday at Puke, but then noticed the strict enforcement of the 95db limit. I have no way to quieten a 999s with Termi's.

Bollocks - make up some noise reducers and pop them oin the outlet end. You'll only need to reduce the outlet hole 25% to knock mack the noise a lot. Bet you notice no loss of power at all.

[Corse1]

Bollocks - make up some noise reducers and pop them oin the outlet end. You'll only need to reduce the outlet hole 25% to knock mack the noise a lot. Bet you notice no loss of power at all.
I have made them for std mufflers. 999 has two obround outlets that are a little more difficult to make DB killers for. Of course I could make them but wanted to get a little insight into those that have experience

[AllanB]

I can remember going to a oldies race at Cust years back. Old race bikes on a dirt track with open megaphone exhausts fatting around in anger. Pretty sure I permanently lost some of my hearing that day.

[Edbear]

I can remember going to a oldies race at Cust years back. Old race bikes on a dirt track with open megaphone exhausts fatting around in anger. Pretty sure I permanently lost some of my hearing that day.

The best part of owning my old BSA B31 was having it WOT in 2nd powering, (!), up Bank St. in Warkworth, the gutted Dunstall megaphone rattling the windows and probably the nerves. :msn-wink:

[CHOPPA]

Bollocks - make up some noise reducers and pop them oin the outlet end. You'll only need to reduce the outlet hole 25% to knock mack the noise a lot. Bet you notice no loss of power at all.

Doesnt work. We put an insert that came with an arrow pipe that cut the outlet to around 50%. The bike was slow and even though it sounded quieter it was actually louder on the db meter. Its a tough rule to follow as you cant do your own testing for it at home and even at practice days your bike may be well under the limit but cloud cover can drastically increase your reading, even a back fire or ping from a quick shifter or traction control can spike the reading. Its sound pressure too so a 125 may be ear piercing but it doesnt have a lot of sound pressure while a superbike may not sound as loud but there is a lot of pressure.