Trackdays & cored cans

bigredduke · 21-01-2010, 07:08 PM

I notice that many trackdays impose 105db limits. My S4R is fitted with standard (but) cored cans. Does anyone have:
a) any idea how loud these might be?

b) trackday experiences with cored cans ( I'm thinking J.P.'s 'No Limits' Cadwell day later this year)?
c) How I could get them tested in advance to avoid being rejected on the day?

21-01-2010, 07:11 PM

105dB is pretty loud! - I'd say you'll be fine... just don't rev it too hard in the paddock!

xxx

LouSCannon · 21-01-2010, 07:26 PM

Find someone with an iPhone and use the app Decibel. It's not 100% accurate, but measured my old 695 at 94db, and at the track it was measured as 96db, so it's good enough to give you an idea... although it has got an upper limit of 105db!

21-01-2010, 07:53 PM

just remember that, because the decibel scale is logarithmic, a doubling in sound level does not double the number of decibels recorded. The logarithm of two is 0.3, so each time the sound level doubles, which means it is multiplied by two, the decibels increase by three dB.

J.P · 22-01-2010, 07:15 AM

The only real way Paul is either to drop into a local garage that might have one and do you a favour and test it. All the track days I've done were tested at 5,000 rpm, or just below if you can sneak it. Gotta to be gentle increasing it from 4,000 up to 5,000 rpm which is better than banging it up to 5,500 and back down.

Mine are bang on 105 db, but I always take my baffles just in case the testing equipment is more sensitive. They're fairly black & white with the pass fail.

You could always do what I did and get a bloke to make up some changeable baffles for you, cost me £35 and takes all the worries away. And remember some tracks are 102 db's and evening track time usually drops to 98 db's....

22-01-2010, 07:56 AM

How far away are you from your nearest track, ride over and get them tested when a track day is on.

bigredduke · 22-01-2010, 10:02 AM

Quote:

Originally Posted by PDL

How far away are you from your nearest track, ride over and get them tested when a track day is on.

That's a good idea

No Limits have quite a few dates listed for Cadwell which is only about one hours ride away. Hopefully, once they have tested all the entrants for that day they may have a few moments to test mine, especially if I tell them I am considering joining them later in the year.

slob · 22-01-2010, 08:44 AM

My 620 with hi-level open Termis was measured at 101dB @6K revs last time we went to Cadwell.

21-01-2010, 07:08 PM	#1
bigredduke Nothing to see here Join Date: May 2005 Location: brough Bike: M1100evo Posts: 1,546	Trackdays & cored cans I notice that many trackdays impose 105db limits. My S4R is fitted with standard (but) cored cans. Does anyone have: a) any idea how loud these might be? b) trackday experiences with cored cans ( I'm thinking J.P.'s 'No Limits' Cadwell day later this year)? c) How I could get them tested in advance to avoid being rejected on the day?

21-01-2010, 07:26 PM	#3
LouSCannon These must fit a Monster? Join Date: Dec 2007 Location: Stockton Heath Bike: Multiple Monsters Posts: 1,036	Find someone with an iPhone and use the app Decibel. It's not 100% accurate, but measured my old 695 at 94db, and at the track it was measured as 96db, so it's good enough to give you an idea... although it has got an upper limit of 105db! __________________ "Sometimes it takes a whole tankful of fuel before you can think straight."

22-01-2010, 07:15 AM	#5
J.P No more Monster... Join Date: Jan 2007 Location: London Bike: Other Not a Ducati Posts: 4,326	The only real way Paul is either to drop into a local garage that might have one and do you a favour and test it. All the track days I've done were tested at 5,000 rpm, or just below if you can sneak it. Gotta to be gentle increasing it from 4,000 up to 5,000 rpm which is better than banging it up to 5,500 and back down. Mine are bang on 105 db, but I always take my baffles just in case the testing equipment is more sensitive. They're fairly black & white with the pass fail. You could always do what I did and get a bloke to make up some changeable baffles for you, cost me £35 and takes all the worries away. And remember some tracks are 102 db's and evening track time usually drops to 98 db's.... __________________ J.JP ------------------------------- My Mum says, there's no such thing as Monsters.

21-01-2010, 07:11 PM	#2
JMo Guest Posts: n/a	105dB is pretty loud! - I'd say you'll be fine... just don't rev it too hard in the paddock! xxx

21-01-2010, 07:53 PM	#4
Jim66a Guest Posts: n/a	just remember that, because the decibel scale is logarithmic, a doubling in sound level does not double the number of decibels recorded. The logarithm of two is 0.3, so each time the sound level doubles, which means it is multiplied by two, the decibels increase by three dB.

22-01-2010, 07:56 AM	#6
PDL Guest Posts: n/a	How far away are you from your nearest track, ride over and get them tested when a track day is on.

22-01-2010, 08:44 AM	#8
slob . Join Date: Jul 2003 Location: East London Bike: Multiple Monsters Posts: 9,714	My 620 with hi-level open Termis was measured at 101dB @6K revs last time we went to Cadwell.