mustanghammer
Well-Known Member
- Joined
- Dec 11, 2017
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- 1
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- 167
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- Location
- Parkville Mo
- First Name
- Scott
- Vehicle(s)
- 2017 Mustang GT
I have performed sound meter tests at Autox events and my race car is subject to SCCA sound rules when I race it. Sound db's are interesting and what sounds loud to the human ear is not "loud" on a db meter. For example my rotary powered race car is loud...really loud...but it meets 103db SCCA sound regulations. On the same track, V8 powered cars that sound quieter to your ears are more likely to trip the db meter than my obnoxious car.
Where sound is measured and what the car is doing when the sound is measured is also relative. A 11:1 Windsor powered autox car with a 4" Howe 2 into 1 muffler coming off of a corner at the bottom of a gear measured 101-102db at 75ft from the course. The same car measured at a faster part of the course, with the meter at the same distance from the course and the engine near its 7500 RPM red line measured 97-98 dbs.
I mention all of this because even with objective measurement processes "loud" can still be subjective. So the best way to avoid this kind of thing is to follow the advice offered earlier:
DON'T BE AN A-HOLE!
Where sound is measured and what the car is doing when the sound is measured is also relative. A 11:1 Windsor powered autox car with a 4" Howe 2 into 1 muffler coming off of a corner at the bottom of a gear measured 101-102db at 75ft from the course. The same car measured at a faster part of the course, with the meter at the same distance from the course and the engine near its 7500 RPM red line measured 97-98 dbs.
I mention all of this because even with objective measurement processes "loud" can still be subjective. So the best way to avoid this kind of thing is to follow the advice offered earlier:
DON'T BE AN A-HOLE!
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