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      07-16-2011, 09:59 PM   #1
kumar911
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How loud is the 1M Exhaust?

I was really curious how loud our 1Ms really are after watching this vid from F gear, anyone know what it actually is in decibels?

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      07-16-2011, 10:15 PM   #2
Dee Pee
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From the CHP vehicle code:

Section 1030-1036, 13 CCR, were intended to be used by Licensed Muffler Certification Stations as a means of detection if an exhaust system met the requirements of the Muffler Certification Program (When those programs were operational) They specify testing procedures for motor vehicle exhaust noise alone (as opposed to total vehicle noise) This procedure specifies a limit of 95 dB measured 20 inches from the exhaust pipe outlet with the engine operating in neutral, typically at speed of 3000-5000 rpm. It applies only to passenger vehicles. It does not apply to motorcycles or to vehicles over 6000 pounds gross weight.

I'm guessing that will be the case for Canadian as well as all US vehicles as CA has the strictest regulations. In order to sell the 1M, the car has to conform to those standards. BUT, in an earlier section, they state that under full accelaration, 50 feet from the car, that the acceptable dba should be 80.

I have a decibel meter and can check it for you but my car doesn't arrive until 8/30 at the earliest.
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      07-17-2011, 02:02 AM   #3
ChrisBuer
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It's been measured at 77db at 70mph.

For comparison, the same car mag measured the e92 M3 at 69db at 70mph and Porsche Boxster at 72db.
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      07-17-2011, 06:01 AM   #4
kumar911
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Thats great, thanks for the info
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      07-17-2011, 04:31 PM   #5
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There was a chart about how loud the 1M is in Auto Motor und Sport.
When idle (Standgerausch) 81 dB, pass by (Fahrgerausch) is 73 dB in the article.

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      07-18-2011, 08:08 AM   #6
Mr.Metak2you
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All the magazine db measurements that they test for vehicles is done on the inside of the car. The purpose of the test is to see how quiet the car is, not how loud the exhaust is. It shows how much tire, wind, road and yes exhaust noise makes it into a car. Poor insulation, aerodynamics etc. can give you a high interior db reading as well.
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      07-18-2011, 03:07 PM   #7
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WHoooo! awesome, only wish i was there to hear it myself. Amazing
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