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Offline stu

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Exhausts and trackdays - twin arrows
« on: May 17, 2018, 05:56:52 PM »
Hi all, is there a particular thread here that has what each different exhaust typically gets measured at in dB for Trackdays?
I'm particularly interested in the twin arrows both with & without baffles for the 2007-2012.
Many thanks
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Offline ManicGTI

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Re: Exhausts and trackdays - twin arrows
« Reply #1 on: May 23, 2018, 04:53:05 PM »
I don't think so, it's a good idea though.  a while ago I did some hunting on this with regards to lowboys and came up with a few random threads here and there but nothing conclusive.

The problem is things vary depending on weather conditions, the testers position, track requirements etc.  Ignore any phone db tester results, they are hilariously inaccurate.

My Comp Werkes low boy is super loud, but eventually I've come up with a home made baffle solution that gets me down to ~99db if required for track use, but it def feels restricted.  With the supplied baffle it's over 105db, I haven't bothered trying without a baffle.

Offline Tomspurs

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Re: Exhausts and trackdays - twin arrows
« Reply #2 on: May 23, 2018, 08:55:18 PM »
The twin arrows are road legal, so they must be ok. Its the Lowboy that's got the NSU thing on it  :028:
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Offline hotmetal

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Re: Exhausts and trackdays - twin arrows
« Reply #3 on: May 23, 2018, 09:25:50 PM »
Some bikes will fail noise tests at some tracks with their standard can on. Can't remember which bikes off hand, and the track in question has a very low noise limit due to local residents. I realise it's a bit vague but the point is, just because a can is road legal or even OE, it doesn't necessarily mean that it will pass scrutineering at every track.

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Offline Will Morgan

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Re: Exhausts and trackdays - twin arrows
« Reply #4 on: May 23, 2018, 10:58:03 PM »
*Originally Posted by hotmetal [+]
Some bikes will fail noise tests at some tracks with their standard can on. Can't remember which bikes off hand, and the track in question has a very low noise limit due to local residents. I realise it's a bit vague but the point is, just because a can is road legal or even OE, it doesn't necessarily mean that it will pass scrutineering at every track.

You thinking of Castle Combe? Here's the relevant webpage with list of road bikes too loud:
https://castlecombecircuit.co.uk/motorcycle-track-days/
I'm going there with my 765R with stock exhaust & asked if it would be OK. I was told to phone & arrange go there on another trackday before mine to have it tested if I wanted - very helpful but only if you live close!

Offline hotmetal

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Re: Exhausts and trackdays - twin arrows
« Reply #5 on: May 23, 2018, 11:13:37 PM »
*Originally Posted by Will Morgan [+]
You thinking of Castle Combe?
Yes! I knew I saw it somewhere, that was it. I don't fancy my chances of getting my 09 through with my Leo Vinces even though they're legal with baffles.


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Offline tim.8061

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Re: Exhausts and trackdays - twin arrows
« Reply #6 on: May 24, 2018, 09:48:55 PM »
So has anyone here actually done a track day at Castle Combe with twin Arrows?

 


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