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      07-25-2013, 04:48 PM   #29
swamp2
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Quote:
Originally Posted by kyleb350 View Post
I'm no expert in this field, but aren't there still a number of unknowns you'd need to know before making these calculations? I see you make an estimate on speed, but wouldn't gearing and exhaust acoustics also come into play? Also, it's probably a safe assumption, but still an assumption that the car is shifting at redline.

Excellent analysis though.
Thanks, gearing and exhaust acoustics absolutely affect the overall spectrum of sound (how much power/peaks occur at which frequencies). There is also a boat load of broadband wind and tire noise in the spectrum. However, you should generally have a prominent peak based on the sound directly from each piston firing and for that gearing and exhaust are not really relevant.
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