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reducing drone

Adding sound deadening to the interior of the car is the only real option. Be advised it is going to take a significant amount of quality mass-loaded volume to be

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Old 11-27-2009, 10:43 AM   #1 (permalink)
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Adding sound deadening to the interior of the car is the only real option. Be advised it is going to take a significant amount of quality mass-loaded volume to be able to block the drone and you are going to end up adding, at minimum, 50 lbs to the car.

Applying it to the hatch alone won't do much because there is no deadening in the rest of the car so it just finds other ways to get through... you'd have to do the whole floor and hatch to make a noticeable impact.

Since you have the 12" resonators you might want to consider swapping for the 18". You'd probably be able to resell your 12" so you might not take that much of a hit.

I have the 18" and the only real annoyance is with highway driving if I need to be applying throttle. Flat roads are fine, but throw some hills and mountains in there and you are constantly dealing with that noise. Everywhere else I think the sound levels are fine.
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Old 11-27-2009, 10:54 AM   #2 (permalink)
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The treatment depends on if the drone you hear is structural or airborne noise related. If structural, adding damping at the attach points of the exhaust would help minimize the energy getting into the structure. If airborne then the mass addition to the interior panels is the way to go only after identifying which panels are the greatest contributors. If most of the airborne noise is vibrating your windows you are pretty much screwed unless you can change the modal characteristics of the window ("add a heavy tint layer"......joking).

Notice all the "ifs". Careful effort identifying the "source-path-reciever" will enable the least amount of weight addition.

You gained HP why throw some of that goodness away by adding unnecessary weight?
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Old 11-27-2009, 11:40 AM   #3 (permalink)
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Adding sound deadening to the interior of the car is the only real option. Be advised it is going to take a significant amount of quality mass-loaded volume to be able to block the drone and you are going to end up adding, at minimum, 50 lbs to the car.

.
My Corvette had a big plastic tub sitting right over the Mufflers. After installing headers and HFC's I had an issue. It resonated like a Bass drum. On Vette's the drone RPM is 16-1800 RPM's which is easy to work around with the next lowest gear selection. Regardless, a liberal coat of Second Skin Damplifier helped quite a bit. Maybe 25-30 lbs worth. Some Z guys have done this...Check over in the Audio section.



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Old 11-27-2009, 03:18 PM   #4 (permalink)
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