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Old 02-04-2013, 04:34 PM   #16 (permalink)
TOOSTUBBORN2FAIL
EcoModding Apprentice
 
Join Date: Sep 2009
Location: Fresno, CA
Posts: 134

Deceptive - '98 Dodge Neon R/T
90 day: 44.38 mpg (US)
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Quote:
Originally Posted by COcyclist View Post
I have a belly pan and didn't notice any noise reduction. I removed the back seat, spare and parcel shelf in my hatchback for about 100 lbs of weight reduction in the VW. The downside was INCREASED noise. I added another 11 lbs on Dynamat sound deadener and still my wife would rather not ride in the car with the back seat out because of the tire noise.
Makes sense, as dynamat is a vibration dampener. The seat, shelf, and spare were better at blocking noise than dynamat is. To block noise, you need a decoupled mass loaded barrier. Something like mass loaded vinyl, separated from the metal by closed cell foam, or lead with closed cell foam on both sides.
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