Targeting bike with loud exhausts

**pritch** · 25th August 2008, 20:06

Originally Posted by vifferman

Kinda pointless restricting some bikes and not others, given that MotoGP bikes have no such restrictions.

I understood that there was a restriction because originally the 990s had mufflers. Ducati turned up with a minimal item that met the spec, then everybody else followed suit.

Not sure what the limit was but those bikes were bloody loud.

**gunrunner** · 29th August 2008, 23:05

Going on poll results so far no 1 fined , sounds like another tax to me

**xknuts** · 5th September 2008, 20:37

Originally Posted by jafar

The decibel restriction is still quite high so most won't be affected.

If you have loud pipes better have the baffles in when it is WOF time

Its not high at all, & a lot are affected

I went to a Muffler shop today to get baffles put in new Slash Ness style pipes. They had their own Db testing equipment. I tested @ 116db with the straight thrus, after baffling still @ 109db. They told me they can do no more and asked for $80.
I'm pissed that new pipes don't necessarily come with baffles ex manufacturer. Looks like steel wool down the pipes for a warrant!

**Gremlin** · 6th September 2008, 00:45

Well, my Racefit Growler went right through wof... baffle was in, and no mention of the exhaust whatsoever...

Now I just have to not draw attention to myself on the road

**McJim** · 6th September 2008, 00:57

My exhaust made the WOF people smile.

Everyone loves the sound of my bike. She sings nice for a 6 hundy...and as an air cooled 2 valve per cyl twin the sound measurment only takes place at 3,000 rpm when she really is quite docile.

Daffyd seemed to enjoy her song when I was overtaking cars on the way back from the March Hare though.

**bikerboy011** · 6th September 2008, 01:08

Didnt have any problems so far, am lovin the Youshi RS-5 Carbon fiber she growls. All i need now is a pc3 and a tune.

**fLaThEaD FreD** · 6th September 2008, 13:53

Originally Posted by Gremlin

Trying to remember if those sort of noise spikes are illegal.... I believe they may be, but I think there is some sort of exclusion as to what warrants a void sound etc. If it is not counted, then the result must be excluded. iirc, you have to have multiple tests, and they must be very similar results.

Also may pay to check that they had their device set correctly, as the rules are very specific as to how the device must measure sound.

Where do I go to get a copy of the rules and operating procedures of the testing device?

**Motu** · 6th September 2008, 15:33

Originally Posted by fLaThEaD FreD

Where do I go to get a copy of the rules and operating procedures of the testing device?

You should have received an infosheet on test procedure when LTNZ sent out the exhaust rules update for the VIRM....that's of course if you are an AVIC.Private citizens don't test their own WoF's....so you don't need to know.

**jc-vtr** · 6th September 2008, 15:54

Originally Posted by Kwakajack

I am the same, full Arrow race exhaust on my 98 Kawasaki ZX6R, rev her hard and she'll scream nicely, but potter about town a gear higher than normal and the noise isn't much above stock. In saying that, its only as quiet as my wrist lets her be . . .

i have a vtr1000 with two brothers exhausts which just got through a warrant,like you say your throttle is also your noise control the more you give it the louder it goes!

**Gremlin** · 7th September 2008, 02:33

Originally Posted by fLaThEaD FreD

Where do I go to get a copy of the rules and operating procedures of the testing device?

http://lvvta.org.nz/stdExhaustNoiseEmissions.pdf

**Toaster** · 16th September 2008, 10:07

Had mine signed off at 97dB.

**Motu** · 16th September 2008, 21:33

I've had a db meter for a week now,and not one single noisy car has come in! But a couple of Harleys have,a Sporty and a Night Train.Unfortunately both had stock systems and put out 90db.Myth busted.

**maybe** · 16th September 2008, 21:39

Same sort of laws over here although they seem to leave bikes alone unless you do somthing stupid in front of them, you also have the transport department inspectors that can book you.

**Motu** · 24th September 2008, 20:59

I finally got to test a big block with open pipes today,a Soft tail Heritage.It had stamped Harley pipes,but they were obviously gutted - it made that sound the sprotsbike riders love to hate.If we had of cracked it wide open to 5 grand and backed off it would of blown the wind sock clean off my meter - but at a steady 2,500rpm (Aprox) it was as soft and gentle as a kitten - 88db.

Heh,heh - oh don't you just love it when everyone is wrong?

**scumdog** · 24th September 2008, 21:14

Got a WOF on the T-Sport last week, stock cans, no guts and stainless-steel end caps with 30mm or so hole in centre.

Passed no sweat.
(and no, I didn't stand over the mechanic, I dropped the bike off and picked it up a couple of hours later)

And Nighthawk, Ghost Bullet etc will vouch it ain't excessive in the noise department.