Exhaust "Rule" Update ...

**Jackrat** · 1st October 2003, 08:10

So Motu,If I bring a Yam XS 650 in to you for a WOF an the thing
has what looks like a standard ex, on it and is not overly loud what is going to happen.I ask this because as you will know a real standard system is practicly impossable to find.And I understand you own one.I mean are you going to ditch your bike
or what??
Thanks,,Jack

**Motu** · 1st October 2003, 10:43

For years I ran slash cuts on it ,but it was way too loud,the missus complained,so I put some of the big baseball bat Triumph style ones on.I couldn't hear a thing - so spiked them with a long bar...not too bad now,sounds about stock.

Anyway - why would ya want a shitter like this......

**Jackrat** · 1st October 2003, 14:15

Errrr,I was thinking more along the lines of a standard copy,that thing is a bit big aye

An who said it was an old shitter anyway

**marty** · 1st October 2003, 17:13

Originally posted by Lou Girardin

As for exhaust noise testing, I believe that the test requires the spl meter to be one meter behind and at 45 degrees to the exhaust outlet. The vehicle then has to be held at 50% of it's rev limit, followed by reving from idle to the 50% limit 3 times.
There's no mention of the environment that the test must be done in, which makes it pointless.
Lou

the testing as stated in the ltsa factsheet is only a suggestion...

Suggested assessment method:
The following is a suggested assessment method that the LTSA and the Police have developed to serve as a basic roadside test. Vehicle inspectors may use this method in conjunction with other methods for assessing exhaust noise.

Increase the engine speed to about half the maximum permitted limit indicated on the vehicle’s tachometer (rev counter). This is the test speed. (A ‘red line’ on the tachometer usually shows the maximum permitted limit.)
Hold the engine at this test speed for about five seconds and then reduce to idling speed.
Follow this with a series of three or four short and sharp speed increases, from idle to test speed.

i can't hear mine at 200kph. does that mean it's ok?

**Coldkiwi** · 1st October 2003, 17:31

Originally posted by Lou Girardin
.
As for exhaust noise testing, I believe that the test requires the spl meter to be one meter behind and at 45 degrees to the exhaust outlet. The vehicle then has to be held at 50% of it's rev limit, followed by reving from idle to the 50% limit 3 times.
There's no mention of the environment that the test must be done in, which makes it pointless.
Lou

...here we go again.

This topic has been beaten to death in the original exhaust laws thread started by marmoot. All this bollocks about 'half the redline at 1m at 45degrees' is a bunch of absolute pants a professor specialising in early childhood hearing came up with in concert with some plonker police inspector (I kid you not). Its only a 'guideline' (the blind leading the blind perhaps) and is in no way enforceable. The only enforcable thing what is laid out in the 1976 traffic reg's and that makes no allowance for roadside testing. Thats just the cops/politicos/LTSA getting to big for their breeches and wanting a quick fix. Any cop handing out a green sticker for an exhaust being 'too noisy' is simply booking an embarrasing day in court where they will be publicaly educated about the difference between 'guidline' and 'regulation'.

btw, if you really care about this, (you'd have to to read this far) check out my long winded posts on that thread or have a read of my submission to LTSA on the whole cock-up. I researched the whole issue to the nth degree (I was just kinda interested to start with as a motorcyclist but as it got longer I got more and more concerned as an acoustic engineer!!) and came to the conclusion that the recently published guidelines (aka "rules" aparently) to the cops and the media were penned by some form of nocturnal marsupial that didn't do so well at school!!!!

the smokescreen of lies and mis-interpretation that is out there right now is a bloody disgrace to this country.

**Motu** · 1st October 2003, 17:58

Quite....in the old thread I mentioned that no standard bike I tested would pass on this method - it's crap man.

**Lou Girardin** · 2nd October 2003, 08:00

Please accept my most humble and grovelling apology for not seeing the original thread and answering a question that was asked. It won't happen again. I promise.

**Coldkiwi** · 2nd October 2003, 17:35

NP lou... can't blame you anyway, its a beast of a thread to wade through! (longest in KB history so far?). my tone of voice (typing?) was more driven by the stupid situation of the legislation not by your question.. I'm just niggly

apologies if it seemed harsh towards you.

**Rainbow Wizard** · 18th February 2005, 17:53

Originally Posted by Motu

Those rules finally came into use on 8 sept - and yes,you could misinterperate the wording - but you'd have to be a fucking idiot!

Some of them even subscribe to this site. I might be arrogant, or even foolish at times, but hopefully only ever an idiot by intention and then only in jest.

Is a comedian waving his arms about a jesticulator?

**Rainbow Wizard** · 18th February 2005, 17:55

Originally Posted by Motu

Just quietly....the modern car or bike has no aural character - unless you do something about it.

Like fart in it for instance

**Monsterbishi** · 18th February 2005, 18:37

Easiest way to sleep easy about exhaust laws is to get your Ride LVV certified with your new exhaust on, then as long as you have a good reason to be wherever you get pinged by the police, they can't do anything against you exhaust/noise wise unless there is a local ordinance stating limits.

**scumdog** · 18th February 2005, 23:58

With me it's not the volume of noise, - it's the time and place I consider (and the 'operators' use of the vehicle)
And a V8 ALWAYS sound better than an automatic Primera going up a hill with a car load!!

**spudchucka** · 19th February 2005, 02:24

Its that fart bag rotaries that get me all worked up.

**speedpro** · 19th February 2005, 21:57

Originally Posted by spudchucka

Its that fart bag rotaries that get me all worked up.

Yeah, I love them as well.

Had an RX4 with a modified 13B. I put a complete Rotomotion exhaust on it and what a sound - beautiful. Blasting (steady 120mph) past Nangara forest when I backed off for the turn it would have flames big enough out the back to light the roadside at night. I ALWAYS wanted a car that did that.

**scumdog** · 21st February 2005, 08:12

Originally Posted by speedpro

Yeah, I love them as well.

Had an RX4 with a modified 13B. I put a complete Rotomotion exhaust on it and what a sound - beautiful. Blasting (steady 120mph) past Nangara forest when I backed off for the turn it would have flames big enough out the back to light the roadside at night. I ALWAYS wanted a car that did that.

Big deal! - my Fiat bambina always did that if you forgot to push the choke button in fully!!