Re: [St] Noise profile for 2006 Sprint ST 1050 c/w sport cans

[Dan Wetherington <dnlwthrn@xxxxxxxxx>]

Barry,
Do you have more info on the requirements?  You can't just impose a dB 
limit, there has to be some specification on how the number is 
acquired.  Here in the US, they say something like this:  (for Illinois 
- Maximum allowable A-weighted sound levels based on measurements taken 
at a distance of 50 feet (Sec. 902.122): 80-82dBA at less than 35mph; 
86dBA at more than 35mph.)  Once you know the distance that they test 
at, you would actually be able to check your bike.  I'm spoiled as I 
have a SPL meter at work.  However, I have a 2003 Sprint with the stock 
can, so I can't help with the profile...

Dan

Barry Evans wrote:
> I have a 2006 Sprint ST 1050 (purchased and serviced in Geneva, Switzerland)
> fitted (and tuned) with the OEM Triumph sports can. Runs like a dream :)
> I've done a couple of track days (and love them), but more and more tracks
> are imposing noise limits. My understanding is that my can puts out about
> 101 dB? A track I'd like to ride in Sept (http://www.circuitdebresse.fr/) ,
> has a max of  95 dB at 60% revs. Anyone have a noise profile (db vs. rpm)
> for this can? 
> I know in my helmet it sounds 'fruitiest' about 60% (c. 5-6k rpm), but not
> sure if that is when it runs at max dB?
>  
> How big a job is it to swap cans? The original is sitting in a box in my
> garage, but I have never touched it. Annoying kids on 2-strokes make more
> noise every bloody hour outside my street, so its hardly a problem running a
> sports can at street speeds here and elsewhere in Europe. And if I did swap
> it temporary for the track, would the bike run OK with the sports tune?
>  
> If its all too much bother, I'll just go for (another) ride on the superb
> mountain roads around here which are now starting to be clear of tourists
> and still clear of snow :)
>  
> Thanks
>  
> Barry
>   

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