Is my exhaust to loud for brands?

Hello,

Whats the easiest wat of finding out how loud my exhaust is, also whats the best way of quietening it down enough for a track day.. Ive got a full stainless system with a yosho end can thats been cut down slightly..

Want to book brands through easy track for the end of may :/

dont you have an ap for your phone that is a decibel reader?.

i looked at that but could only find one that went to 99db :(

dont think the mic on smart phones are good enough..

101dcbels is the limit for brands according to their web site...

Easytrack states -

CIRCUIT LOCATION J3 & J4 of M25/M20 near Fawkham in Kent. POSTCODE: DA3 8NG FULL CIRCUIT GUIDE: HERE

NOISE LIMIT: 105dB static test. RESTRICTIONS: Min age 18yrs. TIMES: Sign-on: 07:30 - Briefing: 08:30 - Start 09:00 - End: 17:00 (or light fail off-season)

and 87.5db ride by

do db killers work well?

Some do, but most only reduce by a couple of dBs and strangle the engine. Go to Brands on a trackday before yours and get it tested with THEIR TESTER. Get the dB killer tested as well. If it's not good enough, gimme a shout and I'll make you a baffle that works!!!!

Brands are very strict on the noise levels, I did an evening one on my CBR400RR with a 98dB limit and failed, well gutted as i lost my £80.

As megawatt says, if possible go down to the track and get it tested by their guys.

Brands indy is 105db static and 98db drive by for that one, GP is 101db and 92db. Evenings are 102db and 92db.

Ok cheers guys, will give them a call and find out when I can go down to get it tested..

Might have to take you up on that megawatt

Cheers

Just had an email from Focused Events about noise restrictions at the track days that they run, here is a copy....

Ok reading about, and talking to our customers, we know there Is lots of confusion about Noise limits and how Its measured!

So here goes!

Firstly I would like to say that I am as frustrated as you are that the circuits cannot get together and measure In a uniform way!

And Its something I have asked them to do for at least 3 years.

Circuits and the limits:

• Donington Park 98db and 105 db measured as a drive by with multiple meters at trackside.
  
• Silverstone 102db drive by meters at circuit (customers are photographed on the national straight as they trigger the meter )but 105 measures at ¾ rev on a static test.
  
• Brands Hatch 105db (ACU) and 92db drive by.
  
• Brands Hatch Eves 102db (ACU) and 92db drive by.
  
• Brands Hatch GP 101db (ACU) and 92db drive by.
  
• Cadwell Park 105db (ACU) and 92db drive-by (day and eve).
  
• Oulton Park 102db (ACU) and 89db drive by.
  
• Snetterton 102db (ACU) and 92db (same for eve).
  
• Bedford 101db (ACU) and 87.5db drive by.
  Statics are all measured as per ACU regulation.
  All drive-bys meters are at 20 metres from the edge of the track.
  
• Mallory Park 105db during the weekdays and Tuesday to Friday.
  Saturdays and Sundays are 98db for Trackdays, these are all measured as a static by the ACU handbook .
  
• Anglesey 105db measured as a static as per the ACU test.
  
• Pembury 102 static test as per the ACU handbook.
  

The ACU measurement:

• 400cc 4 cylinders 8000rpm
  
• 600cc 4 cylinders 7000rpm
  
• 600cc 3 cylinders 6500rpm
  
• 750cc 4 cylinders 7000rpm
  
• 750 cc 2 cylinders 5500rpm
  
• Over 750cc 4 cylinders 5500rpm
  
• Over 750 2 cylinders 5000rpm
  

These should be measured at 45 degrees with the meter 500mm from the end of the can.

So If you had a look through all of that and I didn't bore you too much....here are the problems!




Silverstone measures Its own way, not as per the ACU. Its ¾ rev at the 500mm (no matter what the engine size).

Donington 98db events are now required to have only road silencers or baffles fitted, but heres the problem that customers have.......they pass on a 92 drive by at MSV circuits but these are measured 20 metres back from the track, where the Donington measurement Is taken trackside. So where we have the confusion Is when customers see the 92db drive-by at an MSV circuit and think they will pass at Donington, which they wont.

So I hope thats all helps.




Unfortunately I really don't think we will get a uniform way of measurement which as far as I am concerned Is very disappointing for you the customers, and believe me I have badgered away at this for a few years.
Regarding the compliance.

Well you all love what you do, so I know we will go with It, and to be fair Its not really the limits that have altered drastically, Its only been 1 or 2 db here and there, whats causing the Issues Is that the policing Is more definite.
So Is that a bad thing?

Well If we don't work with the problem and take a responsible approach then yes It will be, because everyone will end up on road systems! and remember how expensive they are to replace.

Here's an Interesting point..... all trackdays at Misano (Italy) are on road systems only.

I was at Donington on Monday to help with the 1st day of the new regulation. I explained the new requirement and everyone was nodding and In agreement. I checked the groups and found 4 problem bikes In group 1, 1 In 2 and none In 3, and then 2 In group 4. All these riders happily went off and fitted the baffle....it was only £25, you lose about 3 HP and you take It out for a noisier event. But after the sighting laps I noticed a rider trying to slip out, and no baffle!

So whats more Important, the £25 and a baffle he can use.....or the closure of a circuit!

I have to be honest, the day really was quieter.

And less stress. Customers where happy, as they were not getting black flagged and pulled In, so they were just riding and enjoying their day and the circuit staff where happy as everything was within the limit.

I think everyone Is starting to understand the problem, I wish It wasn't as confusing ( and hopefully the above Information will help). So lets work together as riders, tdo's and circuits to keep these boring and persistant protesters from winning their war!

Thruxton/Croft and Castle Combe have enough problems, we don't want anymore circuits joining them.




Noise meters are regularly calibrated and you will need to work with the staff at the circuits using them, but remember that an aggressive challenge will never help your case and Its always better to work with them, you will find that they are always willing to help and try to get you sorted and on track.




They need to be repacked on a regular basis, as the packing blows out and then you are too noisy.

Don't always believe what the box says.....how did they measure the system, remember all the different ways that circuits measure and the manufacturer wants to sell his product.

If you can, on a day with a stricter limit, bring your road can with you.

Finally, I hope you have found all the Information helpful, and lets all work together on this noisy subject!

So, basically, always have a baffle with you and have the bike tested, with and without baffle, before your trackday at that circuit. Better to waste money on a baffle you don,t need than at a trackday they won,t let you ride at. If anyone needs a baffle, gimme a shout?

Cheers for the info, pm sent

It wont be long before its stock exhaust only.

Im looking into a European\usa td as i cant be bothered with them here anymore.

Most bikes get through the 105db limit, it's when it's reduced from that there is a problem. Frankly this whole topic is noty one I'm a fan off, it's a race track ffs

Problem I have with a baffle is that on the RR8 the Yoshi R77 baffle is a mare to fit. Worst design for attaching a simple nut and bolt I have ever seen. Be easier to take an alternative exhaust with me

Mikkel wrote:Problem I have with a baffle is that on the RR8 the Yoshi R77 baffle is a mare to fit. Worst design for attaching a simple nut and bolt I have ever seen. Be easier to take an alternative exhaust with me

Same with the Akra & Leo Vince

If the baffle is difficult to fit, I can probably mod it so that it is easier and add some more silencing to it? Can you post pix of what you mean?

It seems that most cans for the RR8 onwards are a bad/tight/obscure fit Re: DB killer

Must be saying, please dont strangle this bikes engine

Will get a photo later, but basically there is a hole for the bolt on the inside of the exhaust with hardly any clearance with the swing arm. The exhaust has a skin, for the carbon effect, but the hole in the skin is not the best alignment with the hole in the exhaust itself, so marrying the two with the hole on the baffle and factor in the lack of room to get your hands in is a nightmare. There is a great possibility for you to lose the nut in the gap between the skin and the exhaust.

Last time I fitted it took me about an hour and a rather ingenious, yet comic, system that involved a bit of string and all my best fishing skills

I've took it out now and hope I never have to try to fit it again... The baffle itself is also quite long and once it has been in and heated up it takes some getting it back out even when you get the bolt out.

If you are gonna do trackdays, you need to get the dB checked, before you pay, with the baffle out and in. If you need the baffle in to do the trackday, then you need to make it easily fitable(?) and removable. Is it easier to remove the silencer and then fit the baffle?

As futile as any form of push back would be I would love to start some form of forum to discuss noise polution at "RACE Tracks". I find it amazing that on a track we are still being squeezed for noise..........absolute joke .....futile even moaning about it but hey ho !!

Kaiser wrote:As futile as any form of push back would be I would love to start some form of forum to discuss noise polution at "RACE Tracks". I find it amazing that on a track we are still being squeezed for noise..........absolute joke .....futile even moaning about it but hey ho !!

Don't get me started. The future of Croft, the only decent circuit for miles in the North East, is under threat due to the neighbours complaining about the noise.

Croft is a bit of a tangled mess...........we have the same issue at our local trcak, East Fortune

It's a bloody race track ffs..........enough said

Spoke to brands, they have a baffle service at the track, I have asked them to advise when I can pop down and have it checked..