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I have noticed that some cars have a second firewall in the engine compartment. It is pressed metal, forward about 10cm / 4 inches of the other, making a cavity behind. I guess it is for further insulation of engine noise and/or body stiffening.
In our case, with the plastic front wheel arches it should help with tyre noise too.
Therefore I am toying with the idea of a "reflective sound curtain" to cover the firewall, hanging down to cover the cavity above the transmission and wrapping forward around the sides of the engine compartment. I am thinking three layers of building-foil insulation (shiny one side and blue on the other). Rather than pull off hoses, pipes and cables etc there would be slits leading to cut-outs for the hoses etc. If the slits were vertically down for one layer and horizontal for the next then vertically up for the third layer, the overlap would block sound through the openings of the slits.
Any negative or positive comments welcome.
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GTS86 Auto (Australia)
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