R6 Track day exhaust

[Blackrandomap...]

Hey folks,

Just been down to castle coombe to get my bike sound tested. It came in at 124DB when most track limits are 105DB

Has anyone got any ideas on what exhaust to get that will be under 105DB?

Currently using a RACE-FIT but even with the baffle fitted its 120db

Thanks!

James
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1x 2001 Yamaha R6 1x 2000 Yamaha R6 !For Sale! £2500 1x 2003 Cbr600rr Racebike 1x 2004 Wr450 Sumo 1x 2001 Ktm520 Sumo

[SuzukiTom]

120 will see you fail at pretty much any noise restircted day. I know castle coombe have turned away totaly sotkc bikes for failing the noise test.

For a track day at CC i would put the stock exhaust on IMO.

[Blackrandomap...]

Yeah, did notice a lot of people with stock exhaust bar the ducati's

So it looks like im gunna have to use my stock can, Shame cos my bike it slow with it on!
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1x 2001 Yamaha R6 1x 2000 Yamaha R6 !For Sale! £2500 1x 2003 Cbr600rr Racebike 1x 2004 Wr450 Sumo 1x 2001 Ktm520 Sumo

[DynaMight]

Castle Coombe measure the sound very differently than most tracks. What RPM's did they get you to rev to and how far away was the Db meter?

Other tracks use the ACU method, which is 7.5k rpm (for a 600cc machine) with the Db meter 2 foot away at a 45 degree angle. Most race cans without baffles will pass. Some tracks have a driveby test, so you can always rev lower past those points.

Some tracks like Mallory Park dont even have a noise restriction, the TDO will say its 105Db, but there is none.


If its a carb'd R6, and hasnt been setup for the new can, I expect it'll run just as well with a standard can.
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[Blackrandomap...]

It was measured at 12'000rpm at around 2ft from the exhaust at about 20 degrees.

Unfortunatly my bike has been set up to the race can

will it make a big difference in power? will it do it any harm?

Thanks
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1x 2001 Yamaha R6 1x 2000 Yamaha R6 !For Sale! £2500 1x 2003 Cbr600rr Racebike 1x 2004 Wr450 Sumo 1x 2001 Ktm520 Sumo

[SuzukiTom]

[Blackrandomap...]

Carbed! just the end can!
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1x 2001 Yamaha R6 1x 2000 Yamaha R6 !For Sale! £2500 1x 2003 Cbr600rr Racebike 1x 2004 Wr450 Sumo 1x 2001 Ktm520 Sumo

[Wafer_Thin_Ham]

[Blackrandomap...]

should be fine then, probably feel wierd to ride if it sounds so different.

Looking at doing malary park on sat 9th! some say there not to bothered on sound, will take stock can anyway!

is malary park any good?
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1x 2001 Yamaha R6 1x 2000 Yamaha R6 !For Sale! £2500 1x 2003 Cbr600rr Racebike 1x 2004 Wr450 Sumo 1x 2001 Ktm520 Sumo

[swiftb]

just bung the standard can on. Youl likely notice a power loss or fairly big flatspot if its jetted for the reacefit -but other than that not really an issue - depending where the flatspot is (if there is one) you can usually clutch it when its about to bog to get past it.

[Blackrandomap...]

Thanks for your info guys!
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1x 2001 Yamaha R6 1x 2000 Yamaha R6 !For Sale! £2500 1x 2003 Cbr600rr Racebike 1x 2004 Wr450 Sumo 1x 2001 Ktm520 Sumo

[0l0dom0l0]

Could always look out for something like a viper as they are in the middle!
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CBT Passed: 30/08/2009, Theory Passed: 31/08/2010, Mod 1 Passed: 6/9/2010, Mod 2 Passed: 13/09/2010. Restriction ended 13/09/2012.

Bikes: 2007 Derbi GPR 50, 1998 Yamaha Fazer 600 (written off), 2002 Yamaha Fazer 600, 1994 CBR 600F, 2003 Triumph Daytona 600, Kawasaki ZX6R J1.....Current: 2006 Yamaha FZ6, 1998 Suzuki TL1000R and a Honda VFR 400 NC30.