Measure db levels before a track day
I'd like to do a public track day but am concerned I might not be under the required db levels with my aftermarket exhaust.
They say the limit is 88 db but that sounds really unrealistic. I know there are commonly-used stock bikes well beyond that.
Is there any way for me to check before I get out there? ie. are the db-meter mobile apps reliable? ie. https://play.google.com/store/apps/d...eter.app&hl=en
And is there a more realistic number that I should aim for?
I use to do a lot of occupational noise exposure assessments for one of my jobs a few years back. I have never tried those apps that measure sound but I assume it won't be as accurate as a sound level meter built to do that specific job. When I worked at this job I would always rent my equipment from concept controls in burnaby. If you have soe extra time and cash you can look into renting one:
you can rent a sound level meter (the quest 2100 will do the job) for a couple of hours. Can't remember the rate off of the top of my head because it was a while ago but they have great customer service if you call and explain your situation I'm sure they can lend it out to you for an hour at a reasonable price. You can even rent a noise dosimeter which is a device you clip to your lapel and it will monitor your dosage of noise for certain period of time and extrapolate your exposure levels for 8, 10, 12 hours etc.
Keep in mind that the decibel scale is not linear but it is exponential, I think when the reading goes up 3 decibels the actual sound pressure doubles. I think 88 db is quite loud for an idling bike. Just some food for thought the occupational exposure limit for being exposed to noise is 85 db over an 8 hour period. A rule of thumb usually is that if you have to raise your voice to have a normal conversation with someone in the workplace then the noise level is over the 85 db and you require hearing protection.
PM me if you want more info
What bike are you running with what exhaust? What group would you be riding in? It is pretty rare for there to be major issues with sound during trackdays at Mission unless you are running basically an open exhaust. Most of the problems are only on high-compression race bikes during race events when people tend to be pushing hard. In the worst case you would have to roll off the throttle or short shift down the main straight.
The 88 dB limit is the number on the meter at the track along the front straight, it's not related to a test standard or anything like that so comparison with different meters or other test standards is difficult. So while the 88 dB limit is tight, it is not like it is measured at full throttle 3 feet from the exhaust or something like that.
Thanks for mentioning the exact method of measurement and how rarely people tend to fail. I should be fine as I'm not planning on going very hard anyway. It's a speed triple with an m4 can. It says it's sitting at 88 db when measuring it with an app at idle and standing right beside the bike.
And thanks m_grewal for the detailed crash course on db's and how the pros measure it.