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reduce diff noise by using roofing insulation under seats?
Posted: Tue Aug 14, 2007 11:54 am
by ssornerrad
I read in the " E30 restoration bible " that a noisy rear diff could be attenuated by sticking roof insulation under the rear seats. Anyone tried this and did it work before I get stuck in and get all itchy from the glass wool?
Re: reduce diff noise by using roofing insulation under seat
Posted: Tue Aug 14, 2007 11:57 am
by maxfield
Not something I've ever heard of on here...
Andyboy who wrote the book is on here though...
Re: reduce diff noise by using roofing insulation under seat
Posted: Tue Aug 14, 2007 12:01 pm
by josh-hocking
best ask andyboy!!
Re: reduce diff noise by using roofing insulation under seat
Posted: Tue Aug 14, 2007 12:44 pm
by ric325i
well a noisy dif could be fixed with a better dif?
but i bet you have thought of that.
why not just go to a scrap yard with an e30 and and use the sound deadening from that double up on that stuff?
i would not be putting any roof stuff in my car!

Re: reduce diff noise by using roofing insulation under seat
Posted: Tue Aug 14, 2007 1:47 pm
by Raj_p
Roofing materials, as in what you use on your house, YES, the roofing sheets you get from B&Q is good stuff, you may need two layers but works a treat, you can alos use this in your doors or boot to stop any vibrations caused by bass.
Re: reduce diff noise by using roofing insulation under seat
Posted: Tue Aug 14, 2007 4:00 pm
by Dr Firefly
I know you probably want info, not opinions, but surely it's better to fix the underlying problem?
Re: reduce diff noise by using roofing insulation under seat
Posted: Tue Aug 14, 2007 5:08 pm
by Chris
I would have thought you are better off putting some Dynomat down rather than roof insulation. I reckon the fibreglass would would be evil
Re: reduce diff noise by using roofing insulation under seat
Posted: Tue Aug 14, 2007 5:46 pm
by slinky2000
jess, the diff isnt meant to be noisey.
e30 restoration bible, never heard of it but I did find it
http://www.bentleypublishers.com/product.htm?code=H740