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post #41 of 80 Old 18th July 2007, 12:13 AM
keang24
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Quote:
Originally Posted by NobleM400 View Post
Where do you want it measured from?
I assume couple feet away from the pipes would be the loundest? Otherwise, where ever would be the loudest? How much is the sound meter from radio shack? I'm interested now (just for a sake of agument with neighbors because my patient/kindness are running out soon with assumption that my exhaust setup meet the legal limit)

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post #42 of 80 Old 18th July 2007, 01:09 AM Thread Starter
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http://www.dmv.ca.gov/pubs/vctop/d12/vc27150_2.htm

Quote:
Regulations Governing Exhaust Systems

27150.2. (a) Stations providing referee functions pursuant to Section 44036 of the Health and Safety Code shall provide for the testing of vehicular exhaust systems and the issuance of certificates of compliance only for those vehicles that have received a citation for a violation of Section 27150 or 27151.
(b) A certificate of compliance for a vehicular exhaust system shall be issued pursuant to subdivision (a) if the vehicle complies with Sections 27150 and 27151. Exhaust systems installed on motor vehicles, other than motorcycles, with a manufacturer's gross vehicle weight rating of less than 6,000 pounds comply with Sections 27150 and 27151 if they emit no more than 95 dbA when tested in accordance with Society of Automotive Engineers Standard J1169 May 1998.
(c) An exhaust system certificate of compliance issued pursuant to subdivision (a) shall identify, to the extent possible, the make, model, year, license number, and vehicle identification number of the vehicle tested, and the make and model of the exhaust system installed on the vehicle.
(d) The station shall charge a fee for the exhaust system certificate of compliance issued pursuant to subdivision (a). The fee charged shall be calculated to recover the costs incurred by the Department of Consumer Affairs to implement this section. The fees charged by the station shall be deposited in the Vehicle Inspection and Repair Fund established by Section 44062 of the Health and Safety Code.
(e) Vehicular exhaust systems are exempt from the requirements of Sections 27150 and 27151 if compliance with those sections, or the regulations adopted pursuant thereto, would cause an unreasonable hardship without resulting in a sufficient corresponding benefit with respect to noise level control.

Amended Sec. 4, Ch. 92, Stats. 2001. Effective January 1, 2002.
Amended Sec. 3, Ch. 569, Stats. 2002. Effective January 1, 2003.



Society of Automotive Engineers Standard J1169 May 1998:

Quote:
Under the SAE standard, a sound meter is placed 20 inches from the exhaust outlet at a 45-degree angle and the engine is revved to three quarters of maximum rated horsepower. The highest decibel reading is then recorded.
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post #43 of 80 Old 18th July 2007, 02:04 AM
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I have the same info from DMV website and print out/posted on my garage door since the first complaints couple months back But I have to admit my setup was way over the limit based on one of the thread (~105dBA with section1&2+e-race or 98dBA for section3 alone if I recalled correctly). My meisterschaft GT should be even louder than e-race. Hopefully, your dixis will give me a leverage against my neighbor/HOA.


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http://www.dmv.ca.gov/pubs/vctop/d12/vc27150_2.htm




Society of Automotive Engineers Standard J1169 May 1998:
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post #44 of 80 Old 18th July 2007, 02:08 AM Thread Starter
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What RPM did you test it? Did you measure it 20" from the exhaust outlet? It's bound to be really loud right there.

Given the stock HP "graph" that BMW released, 3/4hp is 380hp. It's at 380hp at what looks to be 5600rpm.

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post #45 of 80 Old 18th July 2007, 02:26 AM
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Quote:
Originally Posted by NobleM400 View Post
What RPM did you test it? Did you measure it 20" from the exhaust outlet? It's bound to be really loud right there.

Given the stock HP "graph" that BMW released, 3/4hp is 380hp. It's at 380hp at what looks to be 5600rpm.
Actually, I didn't test it, just read from one of the thread or may be from Eisnhaus. So I guess the loudest would be at [email protected] away from the tip? Can't wait to see the number.

Thanks,
Kenny
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post #46 of 80 Old 18th July 2007, 10:56 PM Thread Starter
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At idle, 20" from tip, 45 degree angle, peak measurement:

Cold: 91 dB
Hot: 74 dB

Haven't had a chance to try 5600RPM yet though.

The RS decibel meters are about $30 or so, though the new digital ones are $50.

http://www.radioshack.com/product/in...ductId=2103667
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post #47 of 80 Old 18th July 2007, 11:33 PM
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Quote:
Originally Posted by NobleM400 View Post
At idle, 20" from tip, 45 degree angle, peak measurement:

Cold: 91 dB
Hot: 74 dB

Haven't had a chance to try 5600RPM yet though.

The RS decibel meters are about $30 or so, though the new digital ones are $50.

http://www.radioshack.com/product/in...ductId=2103667
Thank you for posting this info. It's very convenience to have a handy sound meter in hand, huh? Cold at 91dBA and it dropped alot. How was the sound at cold start in your opinion? Do you think it could still disturbing the neighbor? Sorry for asking too many questions, but I'm still paranoid from my past experience.

Just want to be cleared, your measurement included section1 and H-pipe+muffler, right? And I assumed H-pipe is equivalent to eisenmann section2.

Last edited by keang24; 18th July 2007 at 11:35 PM.
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post #48 of 80 Old 18th July 2007, 11:42 PM Thread Starter
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Yep, section 1, 2, 3. I think the biggest difference is the mufflers though.

Cold start is relatively loud. Part of the issue is the garage amplifies the noise. However, the M5 is a noisy car in general at startup, and it's the kind of noise that carries. It's quieter than my 996TT with 3" piping though.
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post #49 of 80 Old 19th July 2007, 12:36 AM
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Quote:
Originally Posted by NobleM400 View Post
Yep, section 1, 2, 3. I think the biggest difference is the mufflers though.

Cold start is relatively loud. Part of the issue is the garage amplifies the noise. However, the M5 is a noisy car in general at startup, and it's the kind of noise that carries. It's quieter than my 996TT with 3" piping though.
Agreed. Section3 is the biggest different. Even at cold start with just section1&2, I think it's quite loud compare to bone stock. How do you compare dixis with e-race/e-sport?

Kenny
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post #50 of 80 Old 19th July 2007, 01:49 AM
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