I know I know the six sounds great in a 914 but I would like to calm the noise a little inside the car.
Is it possible to fit 5mm thick sound deadening under the backpad? I already have the factory tarboard ? in place so not sure if theres room.
Yes, you should be able to depending on how you attach it to the firewall. It will probably not quiet it much, as much of the sound comes through the window.
Do you have a firewall pad on the engine side?
Put dynamat (and/or a similar product) on the back of mine, and the stock backpad fits fine. I did it a little for the sound, and maybe a little more to block the heat. Sweatyback is bad enough in the summer without adding engine heat to the equation. My car is loud AF anyway.
Also make sure the lower butyl tape seal on the rear window is good. I would think that vibration there would make it louder as well.
I found under the seats help. Evidently sound bounces off the road and thru the floor too.
Ok,thanks for the replies, lots of info,I recently moved my engine forward in the car because PO had copied the engine carrier mount wrong and it was to long,now it is a lot better as there was noise transfer from the motor/gearbox because of body contact in 3 area's.
Will try to answer all replys in no particular order;
No soundpad anymore more don't really want one back.
The reply about the floor I think is a good one and makes sense ,food for thought.
Back window has been refitted with correct sealing medium.
I have peeled a lot of weight off this car because I'am a power to weight freak,I will however look at some improvement in noise levels as I'am not the only one in the car,cheers all for replies
http://www.rix914parts.com/store/p29/914_Firewall_Heat%2FSound_Reduction_Mat.html
I knew a guy with a 2.7 and webers maybe PMO's doubled up the glass and it made a difference . But as Nathan said make sure there is no vibration in the glass itself
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