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      08-15-2013, 07:09 AM   #1
budski
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Muffler/Exhaust dB Readings

It would be great to get a list going for an exhaust dB reference!

If possible, could you guys list:
muffler/x-pipe/db
OR
muffler/x-pipe/db requirement (pass or fail)

ex:

Eisenmann Sport / stock x-pipe / 92 db
Eisenmann Race / stock x-pipe / 102 db
OR
Eisenmann Sport / stock x-pipe/ passed @ Laguna (92 db limit)
Eisenmann Race / Challenge Race / failed @ Laguna (92 db limit)

From Nate@iND in a previous thread

Eis SPORT-Version:
moving vehicle = 75 db
stationary vehicle = 92 db at 6.225 1/min
value of backpressure = -25%

Eis RACE-Version:
moving vehicle = apr. 95 db
stationary vehicle = apr. 102 db at 6.225 1/min
value of backpressure = apr. -32%

Thanks in advance!
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Last edited by budski; 08-15-2013 at 07:17 AM.
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      08-16-2013, 07:51 AM   #2
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good idea, I will take some of my car when I get a chance
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      08-16-2013, 12:46 PM   #3
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Quote:
Originally Posted by mkPOTO
good idea, I will take some of my car when I get a chance
How will you measure it? I know "there's an app for that" that apparently works well.

Anyone have insight on the popular devices racetracks use to measure decibels?
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      08-16-2013, 01:15 PM   #4
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I have a dB reader
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      08-17-2013, 03:38 AM   #5
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Quote:
Originally Posted by mkPOTO
I have a dB reader


Once I get home from overseas I plan on order one from Amazon. The Mini Digital Sound Level Meter for $28 has pretty good reviews.
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      08-17-2013, 03:48 AM   #6
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Realistically you'll need everyone to use the same app or device to get accurate readings otherwise it's like comparing dyno charts from two different dynos that are run differently
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      08-17-2013, 03:59 AM   #7
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Quote:
Originally Posted by rjd598
Realistically you'll need everyone to use the same app or device to get accurate readings otherwise it's like comparing dyno charts from two different dynos that are run differently
Very true but hopefully the variation won't be too drastic.

Having everyone purchase the same sound level meter would be best but the most I'm hoping for is enough responses for each system to normalize the distribution
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      08-17-2013, 12:01 PM   #8
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Quote:
Originally Posted by budski View Post


Once I get home from overseas I plan on order one from Amazon. The Mini Digital Sound Level Meter for $28 has pretty good reviews.
I bought that exact one, works well
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      08-17-2013, 12:02 PM   #9
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I tried the app, very different readings them the actual meter. I even tried it with a different phone and reading were off. I will be going to a meet this weekend. I will take my db reader and get readings off all the M3s with different exhaust and take pic, and post
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      08-17-2013, 02:18 PM   #10
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Quote:
Originally Posted by mkPOTO View Post
I tried the app, very different readings them the actual meter. I even tried it with a different phone and reading were off. I will be going to a meet this weekend. I will take my db reader and get readings off all the M3s with different exhaust and take pic, and post
you're a super star, thank you! Will be great to finally have legit #s on these. It's been tried before but with different instruments, so it was no good. Can't wait to see your results!
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      08-17-2013, 04:20 PM   #11
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This was tried before. Look here for some ref

http://www.m3post.com/forums/showthr...light=decibels
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