Noise testing of race bikes - what's the answer?

[JustNick]

Yes Hampton Downs were ok with the noise but our rule from our govening body that has give it a number, Pukekohe have a number too as well as other circuits I'm sure and that munber is 95db.

If MNZ raised that number and we were to run at Pukekohe or any other circuits with 95db as the consented noise limit they could loose resource consent to run that or any other motor event. This is what I'm sure the spoilers are trying to achieve that have moved closer to circuits and are banging on council doors.

Simply put if we dont do something about it, you can bet your ass they will.

Only suggestion is to look at in the short term is to silencing the mufflers more, look at how the quick shifter is wired (fuel or ignition circuit) and that will be a bloody good start.

Clarification please:
So the reason for the 95db threshold that has been set by MNZ is to meet the minimum noise limit requirements for all tracks that are used nationwide?

Questions:
With regards to noise level testing. Which body is ultimately responsible for shutting down a track meet if the level is exceeded? MNZ? Track management? Local council?

Does this body have a formally documented noise level test procedure?
Is this test procedure aligned with the MNZ noise level test procedure?

[gixerracer]

Clarification please:
So the reason for the 95db threshold that has been set by MNZ is to meet the minimum noise limit requirements for all tracks that are used nationwide?

Questions:
With regards to noise level testing. Which body is ultimately responsible for shutting down a track meet if the level is exceeded? MNZ? Track management? Local council?

Does this body have a formally documented noise level test procedure?
Is this test procedure aligned with the MNZ noise level test procedure?

The council is the only one who can shut it dowm based on noise and they measure it from the boundary.
I suspect the PA system at Hampton Downs would have got the meeting closed had the council turned up

[gixerracer]

About 2 superbikes were under the 96db rating on Sat.

And that shitbox crout mobile you ride was 132db they said ae

[Chrislost]

http://www.lvvta.org.nz/documents/st..._Emissions.pdf

So the road limit, of a motorcycle over 125cc, is 100 DB.

What I want to know is why my bike has to be quieter to go on a racetrack, than on the road.

[malcy25]

http://www.lvvta.org.nz/documents/st..._Emissions.pdf

So the road limit, of a motorcycle over 125cc, is 100 DB.

What I want to know is why my bike has to be quieter to go on a racetrack, than on the road.

Do we test to the standard below (cut and past from the link)
a distance from the exhaust outlet of 500 mm (+/‐ 10 mm),
except where the vehicle meets the criteria specified in 2.8(7);
and
(ii) an angle of 45 degrees (+/‐ 5 degrees) to the direction of gas flow,
always using the position furthest from the vehicle’s longitudinal
centreline; and
(iii) the same height as the exhaust outlet, however not closer to the
ground than 200 mm.

No. Apples and oranges.

[lukemillar]

Only suggestion is to look at in the short term is to silencing the mufflers more, look at how the quick shifter is wired (fuel or ignition circuit) and that will be a bloody good start.

These things are pretty popular in the UK (where they are pretty aggressive policing noise at track and racedays), but I haven't seen them here:



Sort of thing that would be handy to have as it would really suck to turn up for a meeting, find out you're over the limit and then have to start packing up as you have no means to quieten your bike.

[tee]

These things are pretty popular in the UK (where they are pretty aggressive policing noise at track and racedays), but I haven't seen them here:



Sort of thing that would be handy to have as it would really suck to turn up for a meeting, find out you're over the limit and then have to start packing up as you have no means to quieten your bike.

Tried that exact gadget a couple weeks back at Pukekohe with a bike running a FULL S/S + FULL LENGTH Akra ROAD carbon can (not the shorty)........

And..... Black flag/FAIL, infringement notice - go home thanks

[Biggles08]

The speedway boys get a +3dB (or 4??) for backfiring/unburned fuel (measured at the venue boundaries I might add) - surely a quickshifter is the same thing..........

Only Quick shifters that don't cut both ignition AND fueling...mine does both so it won't backfire.

[budda]

Tried that exact gadget a couple weeks back at Pukekohe with a bike running a FULL S/S + FULL LENGTH Akra ROAD carbon can (not the shorty)........


The speedway boys get a +3dB (or 4??) for backfiring/unburned fuel (measured at the venue boundaries I might add) - surely a quickshifter is the same thing..........

these baffles have been freely available here, in two different lengths, for the past 15-20 years - ask at your local shop

[budda]

Lol...no budda, you're missing MY point...I know all you have said re the rules is correct and I do not debate that (I would debate the fact my bike was the loudest there however), my question is are the other organizations as you say "getting away with it" or do they have different rules?

I understand your thought process here Biggles, the fact is that what other outfits get away with ( OR get done for ) has nothing at all to do with us as a group. Whoever told you this was fair was bullshitting you man.

We, as a group, are bound by the rules in place at the venues we hire to race on - SIMPLE

If we continually go over their limit, we will not be able to race there any more - AGAIN, BASIC SIMPLE FACTS

If we all do what we can re our OWN bikes, the problem is mostly solved - even SIMPLER TO UNDERSTAND

And in the end, if preventing those who cant be arsed quietening their bike down to legal levels from screwing the rest of us over , by stopping them riding at OUR events, so be it ..........

[budda]

Yes Hampton Downs were ok with the noise but our rule from our govening body that has give it a number, Pukekohe have a number too as well as other circuits I'm sure and that munber is 95db.

If MNZ raised that number and we were to run at Pukekohe or any other circuits with 95db as the consented noise limit they could loose resource consent to run that or any other motor event. This is what I'm sure the spoilers are trying to achieve that have moved closer to circuits and are banging on council doors.

Simply put if we dont do something about it, you can bet your ass they will.

Only suggestion is to look at in the short term is to silencing the mufflers more, look at how the quick shifter is wired (fuel or ignition circuit) and that will be a bloody good start.

Well said, that man .......

[Biggles08]

I understand your thought process here Biggles, the fact is that what other outfits get away with ( OR get done for ) has nothing at all to do with us as a group. Whoever told you this was fair was bullshitting you man.

We, as a group, are bound by the rules in place at the venues we hire to race on - SIMPLE

If we continually go over their limit, we will not be able to race there any more - AGAIN, BASIC SIMPLE FACTS

If we all do what we can re our OWN bikes, the problem is mostly solved - even SIMPLER TO UNDERSTAND

And in the end, if preventing those who cant be arsed quietening their bike down to legal levels from screwing the rest of us over , by stopping them riding at OUR events, so be it ..........

Yes, yes and yes again....

I agree there needs to be a limit.
I agree this limit needs policing.
I agree those that continue to ignore this should be penalized.....

But...

the way 'our' law stands at the moment is too vague in the way it is policed and serious thought needs to go into how to make this law 'fair' and totally enforceable as 'fair.' I think Billy is on the right track here doing what he is doing, making sure there is science behind the testing method to make sure there is no doubt the readings taken on ANY given track in ANY condition is done so with considerations attached to the result. This way last weekend will never happen again.

Do you understand what I'm saying? I think its SIMPLE and I'm really not trying to be a stuck in the mud. If all the riders felt the results were accurate and fair there would be no debate surrounding this issue I'm positive. No one wants a loud bike persay.

[budda]

Yes, yes and yes again....

I agree there needs to be a limit.
I agree this limit needs policing.
I agree those that continue to ignore this should be penalized.....

But...

the way 'our' law stands at the moment is too vague in the way it is policed and serious thought needs to go into how to make this law 'fair' and totally enforceable as 'fair.' I think Billy is on the right track here doing what he is doing, making sure there is science behind the testing method to make sure there is no doubt the readings taken on ANY given track in ANY condition is done so with considerations attached to the result. This way last weekend will never happen again.

Do you understand what I'm saying? I think its SIMPLE and I'm really not trying to be a stuck in the mud. If all the riders felt the results were accurate and fair there would be no debate surrounding this issue I'm positive. No one wants a loud bike persay.

mate, as I've said on another thread here, every single member Club of MNZ received the exact same noise meter at the same time, around 4 years ago if memory serves, complete with very explicit instructions. If you've never seen one til last weekend, take that up with your Club - even better, get INVOLVED with your Club, and help make the needed changes happen

We ALL have no choice in this, tough enforcement of noise levels IS coming whether we like it or not ( and for the record I dont ) - lets just agree that we MUST take some action, and the easiest way is to make sure our own machine is right
...... could have repacked a muffler in the time we've spent pontificating on here, eh?

[Robert Taylor]

And that shitbox crout mobile you ride was 132db they said ae

You spent more time following its exhaust emmissions Craig so its understandable you were more attentive to its noise than had you been ahead of it!

[gatch]

Racing with the classic bikes can be an experience. A whole load of 250 and 350cc singles with no silencer whatsoever can really turn your inner ear to mush. This kind of noise is totally unacceptable.

As an aside we got pinged at the classics festival in feb. 97 and 98 dB readings. Chicken wire and pot scrubber baffles were hastily made and implemented. Readings of 94dB straight away, with no noticeable difference in performance. The bikes don't have to be loud to go fast. I'm all for quietening it down a bit, if there is a consistent and fair way to test everyone.