Modern material for making new interior firewall insulator?

[Kurbycar32]

I wish i noticed this thread when it started. Quiet Ride in Stockton CA makes these with a CAD drawing and computer controlled cutter. Here is their catalog: http://www.quietride.com/catalogpdfs/datsun_z_catalog.pdf

My saga:

https://sites.google.com/a/thecomputerrehab.com/260z/Interior/firewall-insulator

[skydoy]

Hello i would like to get the file to cut my own is it possible?

Edited February 28, 2023 by skydoy
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[Warty]

I ordered a firewall insulation piece a few years ago, just before setting the project aside. Back on the project now, and looking at the firewall piece, it has a black board-like material that you would glue to the firewall, then the jute, then... nothing. I think it should have a layer of black tarry/rubbery stuff facing the driver, no? (My car had a previous "restoration", and while it had black stuff facing the driver, it was shiny, and inside it was not jute, but some kind of fiberglass insulation). 

I think I can just use it as a pattern, and glue something onto it, but... what to use? 

Shiny black with silver foil back. Seems like overkill, also don't not sure it's strong enough to hang the carpet off of? - $33
https://www.amazon.com/Reflective-Silver-Double-Bubble-Insulation/dp/B0BQZ7XDCZ

The Garage Guard by Oil-Dri mat thing: - $24, but maybe a bit heavy? 
https://www.amazon.com/Drymate-Spill-Inches-Premium-Absorbent/dp/B07R185TNN

Vinyl mat - 2 lbs - $29 - maybe the best yet?
https://www.amazon.com/Resilia-Work-Bench-Easy-Clean/dp/B09K5ZCPCZ

Anybody have any other suggestions? 

 

 

 

[Warty]

I think I found a better choice:
https://www.amazon.com/CHERAINTI-Grill-Mat-Non-Stick-Resistant/

16" x 70" (firewall insulator pad is about 15.5" x 52.75"), and looks very thin. Described as 0.2mm (seems off, but...). Good for up to 500 degrees and looks pretty tough. $15.

I'll take some pictures when it is installed. 

 

[Warty]

The grill mat thing came. here are some first impressions:

• It is, in fact, very thin. Kind of like a sheet of thicker paper, but definitely not as thick as yardstick.
• It feels very tough. I think a carpet snap attached this would not pull out/tear away
• The pattern, if you could call it a pattern, is very very subtle. It has a very slight sheen though, it is not a fully flat black

I think it's going to be good, but I have a new idea I'm going to use instead of putting this in front. I'm going to remove the cardboard-like backing that came with the firewall piece, glue this to it to make it much stronger, glue the jute to the back of this, and then glue the jute directly to the firewall. That way, I think it will look very original, but will have some extra toughness which will hopefully prevent the carpet from pulling it to pieces.