Yoshimura rs3 race can on a gsxr750 srad - <101db? - SV650.org

Paul the 6th · 10-07-10, 10:37 AM

Booked on bike magazine road bike only trackday at cadwell on 17th august - noise limit is 101db.

Will my yoshi rs3 race can (no baffles and no option to fit one) pass noise testing?

Picked up a cheap noise meter from ebay for £15 but turning it on and holding it in my hand registers around 60db, shouting at it is around 100db and holding 50cm from can at 45 degree is around 120 db. There's different types of noise meters and I get the impression I've got the wrong one

mikerj · 10-07-10, 10:54 AM

Does it have an 'A' weighted response curve? If so it should be correct - but of course the accuracy of a £15 instrument may not be great.

Paul the 6th · 10-07-10, 10:59 AM

well this is the thing, it's maplins noise meter and I had a look through the book but couldn't see anything about it being type 'a' or 'b' as explained to me by a guy who does noise testing for bike drag racing at elvington in york...

Away from home til sunday so will have a look when i get back

10-07-10, 02:36 PM

when they ask you to rev it to 7.5k just rev it to like 5k, wiill help a little,

mikerj · 10-07-10, 03:44 PM

If you have the "mini" sound level meter from Maplin, then it's C weighting only I think.

Paul the 6th · 10-07-10, 04:06 PM

that's probably the one - what's the difference between the weightings?

Mr Speirs · 10-07-10, 04:18 PM

Hey Mr the 6th!! If you go into the track days bit of this forum there is a similar thread about noise levels, I've just posted a explanation of all the weightings and some other info if you wanna check that out. Anything else you need to know let me know n I'll try answer it.

Linky doodle: http://forums.sv650.org/showthread.php?t=153972&page=3

mikerj · 10-07-10, 05:34 PM

Wikipedia has a chart showing the response of the various SPL weightings. As Mr Speirs says, low frequencies are severely attenuated by an A weighted filter compared to C weighting.

andrewsmith · 10-07-10, 05:51 PM

paul a yoshi race can will be about 120 to 130 db.

You could alway go speak to a acoustics engineer and see if they could test it, be most accurate test possible

Mr Speirs · 10-07-10, 10:57 PM

Just done a small search...the cheap maplins SPL meter is C weighted.

You can safely assume that that meter will be over reading by a margin but probably not by the 20db you are hoping, if it were a V-Twin you might get close but an IL4 might be pushing it.

10-07-10, 10:37 AM	#1
Paul the 6th Member Mega Poster Join Date: Mar 2007 Location: Yorkshire Posts: 4,790	Yoshimura rs3 race can on a gsxr750 srad - <101db? Booked on bike magazine road bike only trackday at cadwell on 17th august - noise limit is 101db. Will my yoshi rs3 race can (no baffles and no option to fit one) pass noise testing? Picked up a cheap noise meter from ebay for £15 but turning it on and holding it in my hand registers around 60db, shouting at it is around 100db and holding 50cm from can at 45 degree is around 120 db. There's different types of noise meters and I get the impression I've got the wrong one __________________ RIP Reeder 20/07/1988 - 21/03/2012 - You were awesome Cbf600, sv650, sv1000, gsxr 750 srad, KTM adventure 950, gsxr 750 k1, gsxr 750 srad, fazer 1000, zx9r ninja..

10-07-10, 10:54 AM	#2
mikerj Member Join Date: Jul 2010 Location: Devon Posts: 876	Re: Yoshimura rs3 race can on a gsxr750 srad - <101db? Does it have an 'A' weighted response curve? If so it should be correct - but of course the accuracy of a £15 instrument may not be great.

10-07-10, 10:59 AM	#3
Paul the 6th Member Mega Poster Join Date: Mar 2007 Location: Yorkshire Posts: 4,790	Re: Yoshimura rs3 race can on a gsxr750 srad - <101db? well this is the thing, it's maplins noise meter and I had a look through the book but couldn't see anything about it being type 'a' or 'b' as explained to me by a guy who does noise testing for bike drag racing at elvington in york... Away from home til sunday so will have a look when i get back __________________ RIP Reeder 20/07/1988 - 21/03/2012 - You were awesome Cbf600, sv650, sv1000, gsxr 750 srad, KTM adventure 950, gsxr 750 k1, gsxr 750 srad, fazer 1000, zx9r ninja..

10-07-10, 02:36 PM	#4
nik_nunez Guest Posts: n/a	Re: Yoshimura rs3 race can on a gsxr750 srad - <101db? when they ask you to rev it to 7.5k just rev it to like 5k, wiill help a little,

10-07-10, 03:44 PM	#5
mikerj Member Join Date: Jul 2010 Location: Devon Posts: 876	Re: Yoshimura rs3 race can on a gsxr750 srad - <101db? If you have the "mini" sound level meter from Maplin, then it's C weighting only I think.

10-07-10, 04:06 PM	#6
Paul the 6th Member Mega Poster Join Date: Mar 2007 Location: Yorkshire Posts: 4,790	Re: Yoshimura rs3 race can on a gsxr750 srad - <101db? that's probably the one - what's the difference between the weightings? __________________ RIP Reeder 20/07/1988 - 21/03/2012 - You were awesome Cbf600, sv650, sv1000, gsxr 750 srad, KTM adventure 950, gsxr 750 k1, gsxr 750 srad, fazer 1000, zx9r ninja..

10-07-10, 04:18 PM	#7
Mr Speirs Member Mega Poster Join Date: Jul 2008 Location: Northampton Posts: 2,218	Re: Yoshimura rs3 race can on a gsxr750 srad - <101db? Hey Mr the 6th!! If you go into the track days bit of this forum there is a similar thread about noise levels, I've just posted a explanation of all the weightings and some other info if you wanna check that out. Anything else you need to know let me know n I'll try answer it. Linky doodle: http://forums.sv650.org/showthread.php?t=153972&page=3 __________________ Smokey Black Burnty 02 - Racetech Smoulderlators + .90kg BBQ Springs, zx10r shockingly toasted, Conti Road Attacks heat up very nicely, R&G Crash Bungs but what f*king use are they, No Colour Matched Hugger, Flame Extenda, Beowulf Titainium Oval Flame Thrower. Last edited by Mr Speirs; 10-07-10 at 04:20 PM.*

10-07-10, 05:34 PM	#8
mikerj Member Join Date: Jul 2010 Location: Devon Posts: 876	Re: Yoshimura rs3 race can on a gsxr750 srad - <101db? Wikipedia has a chart showing the response of the various SPL weightings. As Mr Speirs says, low frequencies are severely attenuated by an A weighted filter compared to C weighting.

10-07-10, 05:51 PM	#9
andrewsmith Member Mega Poster Join Date: Apr 2010 Location: Newcastle upon Tyne, Just south of salad dodging country Posts: 7,750	Re: Yoshimura rs3 race can on a gsxr750 srad - <101db? paul a yoshi race can will be about 120 to 130 db. You could alway go speak to a acoustics engineer and see if they could test it, be most accurate test possible __________________ RIP Reeder 20/07/1988 - 21/03/2012. Always missed squire!!! Every year we meet old friends, gain some new ones, lose old ones and you always remember them all. “Live as if you were to die tomorrow. Learn as if you were to live forever.” Mahatma Gandhi

10-07-10, 10:57 PM	#10
Mr Speirs Member Mega Poster Join Date: Jul 2008 Location: Northampton Posts: 2,218	Re: Yoshimura rs3 race can on a gsxr750 srad - <101db? Just done a small search...the cheap maplins SPL meter is C weighted. You can safely assume that that meter will be over reading by a margin but probably not by the 20db you are hoping, if it were a V-Twin you might get close but an IL4 might be pushing it. __________________ Smokey Black Burnty 02 - Racetech Smoulderlators + .90kg BBQ Springs, zx10r shockingly toasted, Conti Road Attacks heat up very nicely, R&G Crash Bungs but what f**king use are they, No Colour Matched Hugger, Flame Extenda, Beowulf Titainium Oval Flame Thrower.

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