decibel level inside your car science project!!!
02-26-2010, 05:01 PM
#16
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Your best way to compare and eliminate most of the variables would be to have it rev in Neutral, say fix the revs at 4k rpm and have someone measure dB at 1, 3 and 7 meters away from the car.
Other than that you're wasting your time
Other than that you're wasting your time
02-28-2010, 12:20 PM
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Would you state the brand of your exhaust and post the decibel level check at IDLE, HARD ACCELERATION and CRUISE SPEED[ 75mph ]. Also post the MAX decibel level recorded in your car. You may want to elaborate on the decibel level changes with some other components but try to be right on the money and be as precise as possible. It will vary on some different surfaces but maybe take 3 measurements, add them up, divide by three to get an average in each category. This will give us a point of view which exhaust is the most quiet and the loudest. If you don't have access to a decibel meter download an application for yours or your friends Iphone.
The road surface alone would have a variance of at least 30 dB with one car.
Tires "hum", and are tuned for noise. Lou can tell you. Invo vs NT05 anyone? MASSIVE difference.
As for idle, even an open header wouldn't be super loud at idle. Louder than your typical exhaust? yes. Excessive on a production street car? no.
The only way to get consistent results is to eliminate the variables. E.g. All tested on the same car, similar weather, same tires (and level of wear on tires)
Tires "hum", and are tuned for noise. Lou can tell you. Invo vs NT05 anyone? MASSIVE difference.
As for idle, even an open header wouldn't be super loud at idle. Louder than your typical exhaust? yes. Excessive on a production street car? no.
The only way to get consistent results is to eliminate the variables. E.g. All tested on the same car, similar weather, same tires (and level of wear on tires)
02-28-2010, 12:22 PM
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02-28-2010, 12:27 PM
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It has to be done inside the car. My topic is inside sound level. I think you are right Sam, to check the levels at these rpm's thous eliminating the rod condition sound distortion.
02-28-2010, 12:33 PM
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02-28-2010, 12:37 PM
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Totally off topic response please read the topic and relate to it if you wish, peace, Greg
02-28-2010, 12:47 PM
#23
Greg, I hope you've learned by now that arguing with these guys is pointless. They are always right...
Fact is, you have a good idea but you would have to include a bunch of caveats or segregate the measured parameters.
I bought a decent SPL meter for a little over a hundred bucks to measure the different exhausts I have for my truck. It is not a simple tool. I have a notebook so I can keep track of what readings I get with what settings. I can get the thing to read just about any number you want by adjusting the settings.
Fact is, you have a good idea but you would have to include a bunch of caveats or segregate the measured parameters.
I bought a decent SPL meter for a little over a hundred bucks to measure the different exhausts I have for my truck. It is not a simple tool. I have a notebook so I can keep track of what readings I get with what settings. I can get the thing to read just about any number you want by adjusting the settings.
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