Exhaust Noise Level - Yamaha R6 Forum: YZF-R6 Forums
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post #1 of 17 (permalink) Old 01-10-2011, 04:53 AM Thread Starter
Kasanova
 
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Question Exhaust Noise Level

Has anyone gotten and offical reading on the db level for their exhaust? limit is 106 and its measured at 6k RPM. I'm running MJS and a Termi. She's pretty loud just crusing, so I don't want to go to the track just to have to go back home. Thanks

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post #2 of 17 (permalink) Old 01-11-2011, 02:01 PM
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Re: Exhaust Noise Level

I am running Gen1 MJS headers with MTC short can. Bought a decent DB meter. She pushes 112db without db killer and 108db with the DB killer fitted.

I need to sort my system out before the start of the season otherwise im not going to be let near a track
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post #3 of 17 (permalink) Old 01-12-2011, 04:51 AM Thread Starter
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Re: Exhaust Noise Level

where did you get your Db killer??

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post #4 of 17 (permalink) Old 01-12-2011, 04:54 AM
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Re: Exhaust Noise Level

I got it from MTC mate as its the specific one for the can.

The problem is its quite a big bore can and really short! I have decided to go for a custom link pipe and a 5SL can. Doesn't look as good IMO but need to get the noise down for the track!

You might be alright with your Termi though. Have a look on eBay there are some pretty good DB meters which will give you an idea.
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post #5 of 17 (permalink) Old 01-13-2011, 02:37 AM
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Re: Exhaust Noise Level

There is a protocol for the way it's measured though. It should be measured at a 45 deg. angle from the exhaust exit at 4' away or something like that. It isn't simply stuff the DB meter near the exhaust and let it rip. Try measuring it at different angles and distances and you will be surprized at the different reading you get. Remember too that for every doubling of distance you loose 6 Db. of volume. So if you measured at 2' then it will be 6 Db. quieter at 4'. Which would put you at the 106 Db. mark. Also keep in mind the weighting that is used to measure. A and C are the most common. C will produce a lower level than A weighting. A weighting is used to see what volumes are actually being presented and C weighting adjusts to account for how the human ear perceives sound. Since the human ear is less than perfect, the volume is lower. Something to keep in mind. You should find out what the track protocol is.


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post #6 of 17 (permalink) Old 01-13-2011, 03:50 AM
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Re: Exhaust Noise Level

Quote:
Originally Posted by luke geis View Post
There is a protocol for the way it's measured though. It should be measured at a 45 deg. angle from the exhaust exit at 4' away or something like that. It isn't simply stuff the DB meter near the exhaust and let it rip. Try measuring it at different angles and distances and you will be surprized at the different reading you get. Remember too that for every doubling of distance you loose 6 Db. of volume. So if you measured at 2' then it will be 6 Db. quieter at 4'. Which would put you at the 106 Db. mark. Also keep in mind the weighting that is used to measure. A and C are the most common. C will produce a lower level than A weighting. A weighting is used to see what volumes are actually being presented and C weighting adjusts to account for how the human ear perceives sound. Since the human ear is less than perfect, the volume is lower. Something to keep in mind. You should find out what the track protocol is.
You are correct on this. The official ACU regulations are as follows;


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Not sure if you were referring to the way I got my readings however I can confirm I followed the exact ACU regulations and got the following results;

Without DB killer 112DB
With DB killer 108DB

I have just had a custom link pipe made and I am going to run a 5SL Akrapovic can on my 07 R6 in order to get the noise down a bit.

As for the A and C weighting I was not aware of this so thanks for the info!
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post #7 of 17 (permalink) Old 01-13-2011, 05:01 AM
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Re: Exhaust Noise Level

i did a decibel test using c- weight but only at idle not 7000rpm, average was just under 100db. looks like i got a new test to conduct. i'll post the video and results here when weather will allow.


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post #8 of 17 (permalink) Old 01-13-2011, 05:06 AM Thread Starter
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Re: Exhaust Noise Level

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Originally Posted by suggett48116 View Post
i did a decibel test using c- weight but only at idle not 7000rpm, average was just under 100db. looks like i got a new test to conduct. i'll post the video and results here when weather will allow.


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100 at idle
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your going to be SCREAMING once you get into the power band

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post #9 of 17 (permalink) Old 01-13-2011, 05:51 AM
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Re: Exhaust Noise Level


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Quote:
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100 at idle
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your going to be SCREAMING once you get into the power band
my bike is all stock with the exception of the Hotbodies megaphone slipon
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post #10 of 17 (permalink) Old 01-13-2011, 08:02 AM
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Re: Exhaust Noise Level

I had no idea they had noise regulations at tracks. Out of all the places, I thought tracks wouldn't care how loud your exhaust is
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