Track Day Sound restrictions

You could try buying a DB killer off Ebay but if you want to be sure, a cheap old standard can in the van is always a good insurance policy.

First thing is to check what's the limit in your trackday. if it is 105db, you should be fine. If it is 102db, you may not. I have an yoshimura (no buffle) and normally reads 102/103db. If you want to make sure, you can always go to brands on a motorcycle trackday and get it check there. :thumbup

I think is either 5 or 6k RPM. I've done Brands and Snetterton a few times and to be honest, I don't quite remember the distance from reader to exhaust. I reckon you will be ok as long as your can is properly packed.

cadwell with focused events is usually 105dB measured at 5000 rpm my rsv has the aprilia race cans and is very loud but passes at 102 dB

Yep Cadwell is 105db, measured at 5k revs. I have a 2001 mille with 2-2 full Akra system no baffles and is only 100db so you should be fine.

i had an akro race can and it just met the evening(quiet) limit so you should be ok...but a db killer from ebay for £10 is good insurance

solamanda said:

I'm thinking Rockingham. It says 105db. How do they test it, half RPMs and 1m above the exhaust?

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I love rockingham, cracking little circuit. I've been there a few times
now. Twice on an rsv factory with a full ti Akro system and twice on an R1 with straight through race pipes on. I've never been checked for noise. You won't have any issues there mate. Plus if the limit is 105db then you won't have any worries, that's moto gp level.

I think snetterton was 105 last year (did it twice) what you can do is put decibel killer in if when measured it does not pass open a can of red bull remove db killer and wrap around then secure with tie wrap place in exhaust get measured get passed then remove the whole lot job done
PS you did not heat it from me lol

B o B posted this when I asked a similar question a while back. Though I understand different tracks test in slightly different ways.

DB levels for Brands, Oulton, Cadwell, Snetterton & Bedford Autodrome.

Anyone wishing to have their bike tested before a track day is more than welcome to come to one of our circuits and have a noise test free of charge. Simply find a day at your most local track when an event is taking place (all events are listed on our Track day Calendar) and arrive sometime between the start and finish times of the event and we can get your bike tested in just a couple of minutes.
The initial test is a static test which is carried out using a handheld meter. Each bike is measured 0.5 meters away from the exhaust at a 45 degree angle when the engine is being held at the following RPM:
Engine Size 1 cylinder 2 cylinder 3 cylinder 4 cylinder
250cc (4 stroke) 5,500rpm 8,500rpm
400cc (4 stroke) 5,000rpm 6,500rpm 7,000rpm 8,000rpm
600cc (4 stroke) 5,000rpm 5,500rpm 6,500rpm 7,000rpm
750cc (4 stroke) 5,000rpm 5,500 rpm 6,500rpm 7,000rpm
+750cc (4 stroke) 4,500rpm 5,000rpm 5,000rpm 5,500rpm
125cc (2 stroke) 7,000rpm
250cc (2 stroke) 7,000rpm
500cc (2 stroke) 5,500rpm 7,000rpm 7,000rpm

In cases where the motorcycle has two separated exhausts the measurement will be taken as above from the median point between the two.
For bike track days, the noise regulations for each of the circuits are as follows:

Brands Hatch (Indy Circuit) - 105dB daytime, 102db evening
Brands Hatch (GP Circuit) - 101dB

Note: some bookings are run at 98dB, check you booking page for details.

At Bedford Autodrome, we also enforce a drive-by limit of 87.5dB(A) which is measured at a distance of 20m. Whilst we do not currently impose a drive-by limit at any of our other circuits, in the interests of ensuring that the spirit of the noise level limits is respected, we do monitor drive-by levels using noise meters located around the track. If the results of the drive-by monitoring show that your vehicle is generating drive-by sound levels appreciably higher than vehicles with comparable static test results, then you may be called into the pit-lane to address the noise level being generated.
Additional Information
Factors such as air temperature and humidity can affect the level of noise that your bike is producing. This means that whilst on one day your bike is within the respective limits, on another it may fall outside of those limits, preventing you from participating.
For your own piece of mind we urge you to keep a record of your bikes noise level at each event. If you are ever within 1dB(A) of a particular limit then we suggest that you strongly consider having your exhaust looked at before making another booking.

If you go to Rockingham you won't need to worry. They don't carry out the sound level checks, although the day runs a 105db limit, i've never been on one at Rockingham yet when they required the sound level check to be carried out.

Have fun, and make sure you go for the International layout :thumbup