Old 10th May 2020, 04:22 PM #1
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How noisy is too noisy?

Okaaay, time to maybe open a very large can of worms...

The local German discount store (not Aldi) was selling dB meters a few weeks back, and there were a few didn't sell, so they dropped the price down to where curiosity got the better of me and I bought one, just for laughs or scientific investigation......

Note: Most of my bikes have aftermarket exhausts and they're somewhat...anti-social, in that filtering in city traffic generally causes car windows to shut pretty quickly....

On to The "Sound Test"!

So, I fired up the KLR650,( DG "Race" series pipe, with "quiet" insert!), held it at 4000rpm, so a little more than half the redline, and got the son to operate the dB meter. from about 1.5 meters back, but level with the exhaust outlet.

(Now, the KLR is loud, not at idle but any bit of throttle and there's a bark off it that wouldn't put a classic race bike to shame. I added the "quiet" insert straight after fitting the pipe as without it, it was seriously loud. Even so ,my son tells me he can hear every gear change, up and down,when I'm still maybe 2km from home...)

Tried my sound test a few times and averaged..... 94 dB.....AFAIK we're allowed 99 dB...? so I think I'm legal....!

I've yet to"test" the CB500 (unknown brand of exhaust but (was formerly) clearly marked Not Legal for Road Use) or the TRX 850 ( Scorpion pipes with baffles in, might take them out soon)or the little TZR (Micron with added Chinese tail-pipe), but I'm expecting them to be less than the KLR

Never been pulled for a noisy exhaust, other than once on the TZR 125, and that was a grumpy guard on a Deauville in Patrick Street, but can I now advise any guard who might pull me, that my KLR exhaust is, in fact, legal?

Or can some wise soul who can google better than me point me to the Irish offeeshul test method, and limits?
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Old 10th May 2020, 04:57 PM #2
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Re: How noisy is too noisy?

Correct, 99dB is the limit:

https://www.rsa.ie/RSA/Your-Vehicle/...ied-Vehicles-/

It not tested for on bikes (yet). NCT for cages is supposed to check this
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Old 10th May 2020, 06:49 PM #3
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Re: How noisy is too noisy?

I think the meter should be 1m and 45 degrees from the outlet
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Old 10th May 2020, 09:34 PM #4
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Re: How noisy is too noisy?

Can you record sound clips.

I'd enjoy that.
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Old 10th May 2020, 09:56 PM #5
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Re: How noisy is too noisy?

What's it read in terms of dB closer to the redline ? If the Feds ever got to the stage of getting somebody to measure it, they're not going to measure to at half the max RPM I'd say.

The other thing to be careful of is over in Ingerlaand at least, they have (or at least had at one stage) an offence of 'making excess noise with a vehicle' on the Statute books. That just required a statement from a cop to that effect to get you summonsed. Don't think its the same here, but might be worth checking before you start giving out too much lip at a pull :)
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Old 10th May 2020, 10:38 PM #6
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Re: How noisy is too noisy?

A couple of years back Myself HarleyT and Blagadain got our hands on one of those meters.

I think I had a drz with an FMF pipe then she came up to about 103

IIRC toms harley fat bob was close on 120DB.. It was always advisable to be in front of that Harley
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Old 11th May 2020, 01:10 AM #7
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Re: How noisy is too noisy?

Originally Posted by hedzball
A couple of years back Myself HarleyT and Blagadain got our hands on one of those meters.

I think I had a drz with an FMF pipe then she came up to about 103

IIRC toms harley fat bob was close on 120DB.. It was always advisable to be in front of that Harley
Fuck knows what you'd have to be riding to be behind it
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Old 11th May 2020, 02:00 AM #8
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Re: How noisy is too noisy?

Originally Posted by gixxer
fuck knows what you'd have to be riding to be behind it
bmw?
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Old 11th May 2020, 07:00 AM #9
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Re: How noisy is too noisy?

Originally Posted by Gixxer
Fuck knows what you'd have to be riding to be behind it
An ass.
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Old 11th May 2020, 07:54 AM #10
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Re: How noisy is too noisy?

Originally Posted by Gixxer
Fuck knows what you'd have to be riding to be behind it
Something with a seized motor and 2 flat tyres
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Old 11th May 2020, 09:14 AM #11
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Re: How noisy is too noisy?

You can download a DB meter on your smart phone. Must test my RSV next time I take her out..
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Old 11th May 2020, 09:21 AM #12
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Re: How noisy is too noisy?

Originally Posted by Gixxer
I think the meter should be 1m and 45 degrees from the outlet
Half a meter per page 94 of https://www.rsa.ie/Documents/NCT/New...ual%202018.pdf

Note that dB drops off massively with distance - so at 1.5m and 94dB could easily be over 99dB at 0.5m

P
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Old 11th May 2020, 11:45 AM #13
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Re: How noisy is too noisy?

Originally Posted by Gixxer
Fuck knows what you'd have to be riding to be behind it
The owner..................
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Old 11th May 2020, 03:52 PM #14
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Re: How noisy is too noisy?

Originally Posted by Jack stowage
The owner..................
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Old 11th May 2020, 04:49 PM #15
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Re: How noisy is too noisy?

Originally Posted by dukeNblade
You can download a DB meter on your smart phone. Must test my RSV next time I take her out..
Most phones will have a limit on which their mic will max out and usually wont do louder noises. Somewhere around early to mid 90s iirc
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Old 11th May 2020, 04:56 PM #16
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Re: How noisy is too noisy?

Originally Posted by TuneR
Most phones will have a limit on which their mic will max out and usually wont do louder noises. Somewhere around early to mid 90s iirc
Ahhh so no sense shouting into the phone
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