Floor tar repair/ restoration Options

[TonyA]

What does everyone use to repair floor tar sound deadening material. I have some popping up very little rust the cause of course. I am removing a small amount to good sound completely rust free areas and want to restore that to like new appearance. Any suggestions?

[nivekdodge]

I would imagine the determining factor here is the open engine cover being 12" behind our heads.And the fact that not many have A/C and the ability to close the windows in summer. The high end cars were using two layers of steel with nvh material in between. I put some dynamat on the floor because I had it but I don't expect it to be quiet. for you guys that get together, Is anyone's car quieter than other?

[Superhawk996]

I would imagine the determining factor here is the open engine cover being 12" behind our heads.And the fact that not many have A/C and the ability to close the windows in summer. The high end cars were using two layers of steel with nvh material in between.

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Modern cars also using laminated (and thicker) glass on things like the side windows (usually just tempered glass) to reduce outside noise intrusion.

914 rear glass is thin by modern standard.

There is a ton of NVH treatment in a modern car that most have no appreciation for other than to appreciate that new cars are far quieter than they were back in the 70s.

Modern cars often have the entire suspension mounted to an isolated sub-frame. It’s great for noise reduction but adds transient delay to steering. 914 is much more directly connected to the road precisely because it lacks that sort of isolated subframe. The down side is much more noise transmitted into the cabin.