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Fancy Tech: How to Get Rid of Exhaust Drone, works great!

If there is temperature change in the exhaust due to outside ambient temps the speed of sound will change and the wave length will also be affected. Frequency=Speed of sound/Wave

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Old 07-30-2010, 10:28 AM   #7 (permalink)
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If there is temperature change in the exhaust due to outside ambient temps the speed of sound will change and the wave length will also be affected.

Frequency=Speed of sound/Wave Length

This may be a non-issue if the exhaust temps are not affected much by the outside temps.

my 2 cents

This is true for the math, but the exhaust temps should be pretty similar despite outside temperatures. Perhaps a bit cooler in the winter but still pretty close. The side branch resonators cover about 15 points of frequency completely and then begin to lose a bit of efficiency. On my car it knocked out all the drone from 2200rpms through 3000rpms. I expect in winter for the car to make a bit more noise but probably not much. Can always report back when its cold outside.
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