story time: loud Berk exhaust
02-28-08 | 02:19 PM
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From: Vancouver, BC
story time: loud Berk exhaust
02-28-08 | 02:27 PM
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From: Vancouver, BC
aww boo ... ok i'll cut and paste 
... i can see it being possibly useful to some of us too.
i only took the important part
keeping in mind this was on an MR2, but that shouldn't make a huge difference
... i can see it being possibly useful to some of us too.i only took the important part
I got my Berk Exhaust + DP tested today by an environmental health and safety technician at my University.
He calibrated his machine just prior to the test.
The results were as follows:
1 meter away from the tips, at 3000rpms the decibel reading came out between 84-86dba
2 meters away from the tips, at 3000rpms the decibel reading came out at 82-83dba
Remember now that the police tested my exhaust as being 92 dba!!!
We tried to replicate this result, and discovered that the only way to replicate this was to either actually insert the measuring device INTO the tip to take a reading, or to hold the device 6 inches away from the tips, IN the exhaust stream. At this range, the device does not measure sound, it is instead measuring the air pressure which equates to a very high decibel reading.
If anyone gets a ticket for a loud exhaust, ask the police the following questions in court:
How recently did they calibrate the device?
How did they calibrate the device?
How far away did they hold the device when doing the measurement?
Did they hold the device in the exhaust stream when doing the measurement?
Was the measurement done in a controlled environment?
(The ambient city sound can be as high as 92dba. Which coincidentally is the same sound level that the cop came up with)
He calibrated his machine just prior to the test.
The results were as follows:
1 meter away from the tips, at 3000rpms the decibel reading came out between 84-86dba
2 meters away from the tips, at 3000rpms the decibel reading came out at 82-83dba
Remember now that the police tested my exhaust as being 92 dba!!!
We tried to replicate this result, and discovered that the only way to replicate this was to either actually insert the measuring device INTO the tip to take a reading, or to hold the device 6 inches away from the tips, IN the exhaust stream. At this range, the device does not measure sound, it is instead measuring the air pressure which equates to a very high decibel reading.
If anyone gets a ticket for a loud exhaust, ask the police the following questions in court:
How recently did they calibrate the device?
How did they calibrate the device?
How far away did they hold the device when doing the measurement?
Did they hold the device in the exhaust stream when doing the measurement?
Was the measurement done in a controlled environment?
(The ambient city sound can be as high as 92dba. Which coincidentally is the same sound level that the cop came up with)
Last edited by Faymester; 02-28-08 at 02:31 PM.
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