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Rasmus · 26th May 2007, 17:00

I wouldn't use too much of bimast. Vibroplast itself is very good but its much thinner and lighter.
If I was to do my Civic over again, this is what I would use:
1 sheet of vibroplast for each door
1 sheet of bimast for each wheelarch
1 sheet of vibroplast for the trunk
1 sheet (I suppose) of vibroplast for the roof
So total of a package of bimast and 6 big sheets (or 4 packages) of vibroplast + some soft isolation material should be enough.
You can always go nuts and do your whole car - like these guys ( http://www.kalliojarvi.net/ibiza/vaimennus/ ), but in the end the more isolation the more weight and like I said, you will never make this car into a luxury vehicle, so in my view there is no point in doing that much. And remember, that reducing sound means reducing vibrations, so its good to use different materials in layers.
For example, road/tyre noise is a lower frequency, so it can be reduced by adding thick, elastic substances on metallic areas (vibroplast) to stop it flooding around the car, but there are also higher frequency noises which are better suppressed by foams, cloth etc.
So remember, its not a matter of quantity, but a matter of smart placement.

26th May 2007, 17:00	#20 (permalink)
Rasmus Valve Cap Join Date: 10th February 2007 Location: Tallinn, Estonia Posts: 28 Thanks: 0 Thanked 9 Times in 4 Posts iTrader: (0)	I wouldn't use too much of bimast. Vibroplast itself is very good but its much thinner and lighter. If I was to do my Civic over again, this is what I would use: 1 sheet of vibroplast for each door 1 sheet of bimast for each wheelarch 1 sheet of vibroplast for the trunk 1 sheet (I suppose) of vibroplast for the roof So total of a package of bimast and 6 big sheets (or 4 packages) of vibroplast + some soft isolation material should be enough. You can always go nuts and do your whole car - like these guys ( http://www.kalliojarvi.net/ibiza/vaimennus/ ), but in the end the more isolation the more weight and like I said, you will never make this car into a luxury vehicle, so in my view there is no point in doing that much. And remember, that reducing sound means reducing vibrations, so its good to use different materials in layers. For example, road/tyre noise is a lower frequency, so it can be reduced by adding thick, elastic substances on metallic areas (vibroplast) to stop it flooding around the car, but there are also higher frequency noises which are better suppressed by foams, cloth etc. So remember, its not a matter of quantity, but a matter of smart placement.