Vehicle noise tests - New rules

**scumdog** · 18th December 2007, 07:13

Originally Posted by huck farley

When will these no brainers wake up. First thing they do when they buy a new piece of shit Harley, is to put a fukn great drill up the pipes. Huck Farley

Hey Kuch Rafley, if I sent my H-D mufflers up to you would you 'put a fukn great drill up the pipes'?

Cos sure as hell I can't see how it would make one jot of difference on the mufflers MY Harley came with.

(Goes outside on this sunny morning and climbs onto shimmering, shaking, jack-hammer, piece of gutless, shiney, roaring its head ofF........... gutless piece of shit.. and goes looking for sister to extract sailor from)

"Glad to have been pissing everyone off with the racket I make since 1987"

PS Chuk Lafrey, you ain't one of the above sailor are you?

**The Lone Rider** · 18th December 2007, 09:27

I think anyone who says the "new" sound level laws are because of people who own Harley's need a serious head check.

Find me a 40-60 year old man, as that is the age bracket of most people with harleys, who rides around at 2am revving their engine.

The laws came about due to a younger age group with a few more wheels on their vehicle.

Oh and yes, a difference of 9 db is noticeable. Decibels are in a logarithmic scale, not linear.

In the end the "new" laws will hardly effect people with bikes unless you have pipes that are stupidly loud (definition: can be heard from around 3/4 of a Km away), and even then you will only get a 10 point deduction and a small fine. Or if you have a semi loud bike, that you drive around at 2am.

I haven't been pulled over yet on my newer bike, and I frequently use my bike late at night.

**Subike** · 18th December 2007, 10:05

Get it right
Listen to a 4 cylinder jappa under hard acceleration that is fitted with a 4 into1
That sure sounds a frigging lot louder and can be heard for a greater distance than any slash cut or drag pipe fitted harley.
I have a Harris Exhaust fitted to my Exessive,
You can hear it over a pack of harleys, because it SCREAMS!

The laws are being bought in because of the aftermarket exaust suppliers who dont give a rats ass if their exhaust systems are loud.
All they care about is sucking that dollar out of the boy racers, and any other fool like me who buys their product.
Want to quieten down exhausts? Aim the laws at the product producers and the retail outlets that fit them.
So you want a 4" big bore exhaust...then buy a fucking MACK TRUCK!
because thats about the only thing that needs such a size... not a 4 cylinder jap import car.
Yes we will be penalised for loud exhausts because of blatent on selling of oversized units by exhaust suppliers.
But was it Harley Powered TQ's that got the decibel level dropped up there in the Dorkland area...what was the name of the race way, slips my southern mind..The one that has the boxing day raceing......
Yeap as the population grows, and there is less room to swing a cat, more rules will come into being.
Sad that the Free Spirted people like Bikers, Race driver, Fishermen, Trampers, Off road entusiasts end up loosing their enjoyment of life because of poncy bitches in the polished stainless steel kitchen, want a bit of quiet time to play with their cake mixes. Even when they build there house next to an existing motor sports venue!!! Go figger that one!
But I do agree that the boy racers, late at night, are the biggest bane.
Not the motor cyclist!

**The Lone Rider** · 18th December 2007, 10:41

Originally Posted by Subike

Get it right
Listen to a 4 cylinder jappa under hard acceleration that is fitted with a 4 into1
That sure sounds a frigging lot louder and can be heard for a greater distance than any slash cut or drag pipe fitted harley.
I have a Harris Exhaust fitted to my Exessive,
You can hear it over a pack of harleys, because it SCREAMS!

The laws are being bought in because of the aftermarket exaust suppliers who dont give a rats ass if their exhaust systems are loud.
All they care about is sucking that dollar out of the boy racers, and any other fool like me who buys their product.
Want to quieten down exhausts? Aim the laws at the product producers and the retail outlets that fit them.

There is the problem of compliance. Namely different exhaust systems will output a different SPL levels depending on what they are fitted to. So that would cause problems trying to make laws on the products being sold

**Pancakes** · 20th December 2007, 12:56

Originally Posted by AllanB

...........................I see my new Hornet has a sticker saying at 4500rpms it is rated at 85db. My GS1200ss had a full Yoshi system rated at 94db - man that 9db is a lot of difference! About 90 would be sweet.......................

Originally Posted by LLAMA SOLA

...................Oh and yes, a difference of 9 db is noticeable. Decibels are in a logarithmic scale, not linear.......................

(Roughly) 3 dB creates double the sound energy. Thats why there is a big difference between 97dB and 100dB or more importanty 97 and 109dB! 4 times the sound energy. People hear different frequencies at different volumes too.

Originally Posted by Subike

.............................So you want a 4" big bore exhaust...then buy a fucking MACK TRUCK!..............

A full system up to 3" assuming straight thru cans and nice bends will make more power at lower boost and let boost come on faster on a 2L turbo car. The tip is normally a bit bigger which is why it looks like 4". It may not be your style but if it works and thats what those people are into why wouldn't you do it?

**The Lone Rider** · 20th December 2007, 13:01

Originally Posted by Pancakes

(Roughly) 3 dB creates double the sound energy. Thats why there is a big difference between 97dB and 100dB or more importanty 97 and 109dB! 4 times the sound energy. People hear different frequencies at different volumes too.

You are forgetting that the human ear hears a 3db change as only a small change and a 10db change as roughly double or half even though the actual science to it says otherwise.

In other words we don't hear what is really going on.

**Pancakes** · 20th December 2007, 13:40

Yep your right but it is valid in terms of mechanical testing. People still get the idea that 100dB isn't just twice as loud as 50dB.

**Jantar** · 20th December 2007, 14:05

Originally Posted by Pancakes

(Roughly) 3 dB creates double the sound energy. Thats why there is a big difference between 97dB and 100dB or more importanty 97 and 109dB! 4 times the sound energy. People hear different frequencies at different volumes too.

Umm, not 4 times the sound energy, but 16 times the sound energy. 3db is double, the next 3 db is double again (ie 4 times), the next 3db is double that again (ie 8 times), and the last 3db is double again or 16 times the energy.

**Pancakes** · 20th December 2007, 14:13

Your quite right, thats what I meant.

**davereid** · 20th December 2007, 18:22

Originally Posted by Jantar

Umm, not 4 times the sound energy, but 16 times the sound energy. 3db is double, the next 3 db is double again (ie 4 times), the next 3db is double that again (ie 8 times), and the last 3db is double again or 16 times the energy.

Quite true... but 3dB is commonly considered to be the smallest change detectable by the human ear..

So even a 3dB increase - a doubling of power would be un-noticeable to most deaf old bikers !

The issue to me is not how loud it is. Its why is it going around and around and around my bloody house at 4am !

**homer** · 20th December 2007, 18:43

wouldnt be to concered everyone
after all they cant just do a ear test and most new ford and holdens from the factory wont make it

**xwhatsit** · 21st December 2007, 00:38

Originally Posted by huck farley

You don't have to be Einstein to work out that the idiots riding Harley's with straight pipes, have fucked it up for everyone.

When will these no brainers wake up. First thing they do when they buy a new piece of shit Harley, is to put a fukn great drill up the pipes. So now they have this shimmering, shaking, jack hammer, piece of gutless, shiney, shit roaring it's heads of, the fact still remains that they are a gutless heap of shit, that wouldn't pull a soldier of your sister.

OK, now that they have pissed everyone of, with the racket they make. The law makers are bringing in new laws that fuck it for everyone.

Harley owners want shooting with a ball of their own shit. IMO
grrrrrrrrr!!
Huck Farley

You are an angry man. Did a Harley owner make off your wife?

**huck farley** · 21st December 2007, 06:58

Originally Posted by Guided_monkey

Hands up all those people with modified exhausts.

http://www.ltsa.govt.nz/rules/vehicl...t-2007.html#31

As I have said at the start of this thread I have been to Anza motorcycles and have seen the guys in the workshop drilling out the Harley pipes. Well those Idiots that have done that are stuffed because they have no stock pipes to put back on if pulled up for noise pollution. Just shows how dumb some of these HOG owners really are.

As far as the hands up goes, I have got my hand up. I have a Remus can on my Trumpet. But I used my brains I got the can with the removable baffle. I have it in at the moment and is real quiet. I only take it out for Triumph RAT raids three times a year. Why piss folk of like the Harley idiots do. A recipe for disaster, and whatdoyaknow Some of the Harley riders have pissed folk of that much with their ear shattering pieces of Yankee shit. It has prompted a law change to nail us all now. How fukn dumb is that!!!

**nallac** · 21st December 2007, 07:00

Originally Posted by scumdog

Hey Kuch Rafley, if I sent my H-D mufflers up to you would you 'put a fukn great drill up the pipes'?

Cos sure as hell I can't see how it would make one jot of difference on the mufflers MY Harley came with.

(Goes outside on this sunny morning and climbs onto shimmering, shaking, jack-hammer, piece of gutless, shiney, roaring its head ofF........... gutless piece of shit.. and goes looking for sister to extract sailor from)

"Glad to have been pissing everyone off with the racket I make since 1987"

PS Chuk Lafrey, you ain't one of the above sailor are you?

if hes a sailor he'd be after your brother not your sister...

**huck farley** · 21st December 2007, 07:17

Originally Posted by xerxesdaphat

You are an angry man. Did a Harley owner make off your wife?

No mate why? Because they are to busy poking there plonkers up the exhaust pipes. And by the way my Mrs hates fukn Harley's also. God bless her.
I do have some good Harley mates. But they are in the higher IQ bracket. Because they have after market pipes on, and the original pipes hanging up in the shed just in case they get nicked.