Noise Limit

DB killers

The top picture is the DB killers for my 2014 1199S with full Akra, 208 HP at the crank.

Inside diameter is 38.32 mm

The next row are the BD killers for my V4S with full Akra, 226 ponies at the crank.

Inside diameter is 27.82 mm

Anyone else see a bit of a problem here?

Our local track is very similar on paper (below) however in practice they just check you at entrance and give you a passing sticker for the season.

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Sound Management & Restrictions
All Participants must adhere to the mandatory noise restriction of 92 dB or lesser without exception. Calabogie Motorsports Park will measure noise levels of ALL vehicles and/or equipment prior to being granted access to the track.
In today’s Motorsport activities, sound management a joint task shared by all members including tracks, clubs, participants, promoters and even fans. As an established motorsports facility, Calabogie Motorsports Park (CMP) has imposed its own noise guidelines, testing procedures and maximums to ensure CMP creates a favourable environment for all.

1. Screening Test – After a brief visual muffler check, a stationary test is undertaken. Sound levels will be measured 15 feet in front and behind the vehicle while the engine is revved at the maximum allowable rpm or the red line of the tachometer.
   • Cars, the average should be no more than 100 dbA with no single reading over 104 dbA.
   • Motorcycles, the average should be no more than 98 dbA with no single reading over 100 dbA.
2. Pass-by Test – With the vehicle under full acceleration on the track, a reading will be taken from 50 feet. The maximum level allowed is 92 dbA. This level and standard is the most commonly used in North America and Europe and is where the entire industry is headed. Tests are valid for 9 months unless modifications to vehicle are made.

Cars and motorcycles that do not meet the noise criteria in the pass-by test will be black flagged and will not be allowed to run until modifications have been made and a re-test performed to ensure compliance with the guidelines. It is the driver’s responsibility to ensure their vehicle meets the noise restrictions that Calabogie Motorsports Park has in place.


https://www.calabogiemotorsports.com/track/

There's flexibility as a few feet in distance makes a huge difference.

For example, I have a SC-Project Carbon Conic on my Monster 1200R and with the baffle removed it's loud.
However, I was concerned about riding where LEO has road-side sound testing.

I also have a US version Panigale (which is one the loudest stock production bike available).
Therefore, I tried to replicate SAE J2825 and measured the difference both at idle and at 2500 rpm with a decibel meter.
I figure that if the Monster with the SC-P (baffles out) is no louder relative to the Panigale then I would have the high ground in court if it came down to it.

The SC-Project Carbon Conic is no louder (measured) relative to the stock Panigale although it seems louder to the ears.

However and more to the point of distance vs decibels, using SAE J2825 standards (1 [email protected] degrees), the Panigale measured about 97 at idle and about 102 at 2500rpm. The track marshals measured my Panigale at 93db from 15ft @ 8000rpm.
Conclusion:
Distance and other environmental influences such as other bikes nearby will affect the readings. There's flexibility for sure.