Want to Hear Your Opinions on Cost-Effective Thermal Barriers for Floor and Transmission Tunnel

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Duster256

Honolulu, Hawaii
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After about 30 minutes of driving, the inside of my car gets hot like heck due to exhaust system (headers/dual exhaust pipes) radiant heat transfer through the floor pan and transmission tunnel - to the point where my wife doesn't enjoy riding in the car. I put 1/2-inch thick, adhesive-backed closed-cell foam rubber insulation sheets on the inside of the firewall (under the dash) and it does a good job there of preventing heat transfer from the engine compartment. I may consider putting a thinner 3/8" or 1/4" closed-cell foam rubber insulation under the carpet, front and back.

What can I do on the underside of the car to reduce heat transfer through the floor pan? I'm considering adhesive, foil-backed thermal barrier sheets from Home Depot on the inside of the transmission tunnel and underside of the floor pan above the dual exhaust pipes and mufflers. I'd like to hear what others are using as a cost-effective barrier to reduce heat transfer through the floor. And what about those 1/2" tall exhaust pipe shield standoff mounts that clamp to your pipes using standard stainless steel hose clamps - are aluminum exhaust shields standing 1/2" above your exhaust pipes (like modern cars) more effecting in dissipating exhaust heat and preventing floor plan heating than reflective foil backed sheets adhering to the underside of the floor pan? Let the discussion begin - thanks FABO Nation.

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I went to our local "Foam Factory", and purchased "gym mat". Closed cell foam, black, and comes in many thicknesses. That and 3M spray glue. It was much cheaper than automotive stuff.

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After about 30 minutes of driving, the inside of my car gets hot like heck due to exhaust system (headers/dual exhaust pipes) radiant heat transfer through the floor pan and transmission tunnel - to the point where my wife doesn't enjoy riding in the car. I put 1/2-inch thick, adhesive-backed closed-cell foam rubber insulation sheets on the inside of the firewall (under the dash) and it does a good job there of preventing heat transfer from the engine compartment. I may consider putting a thinner 3/8" or 1/4" closed-cell foam rubber insulation under the carpet, front and back.

What can I do on the underside of the car to reduce heat transfer through the floor pan? I'm considering adhesive, foil-backed thermal barrier sheets from Home Depot on the inside of the transmission tunnel and underside of the floor pan above the dual exhaust pipes and mufflers. I'd like to hear what others are using as a cost-effective barrier to reduce heat transfer through the floor. And what about those 1/2" tall exhaust pipe shield standoff mounts that clamp to your pipes using standard stainless steel hose clamps - are aluminum exhaust shields standing 1/2" above your exhaust pipes (like modern cars) more effecting in dissipating exhaust heat and preventing floor plan heating than reflective foil backed sheets adhering to the underside of the floor pan? Let the discussion begin - thanks FABO Nation.

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Here's a great alternative.


LizardSkin 1303-1 LizardSkin Original Ceramic Insulation | Summit Racing
 
I read several years ago of a homebrew version of lizard skin. Unfortunately I don't remember where.
Google search, maybe?
Or maybe a header wrap for the exhaust under dr/pass feet?
 
All good suggestions received so far . . . keep those suggestions coming!
 
Just get the carpet with Mass Backing. Mine is Under-coated and doesn't get too hot.
 
I used Kilmat as mentioned above. Helped in the Demon. I used Home Depot style HVAC for my daily pick up. Worked well and cheap. I feel the Kilmat was better. Took a full day to pull seats and carpet, install and put all back together.
 
Mass backing makes a big difference. I have a car with it and without.

In a pinch, I laid down that big box store double sided silver bubble wrap. It did a great job on a cross country trip, temps 80+.

Going to replace with the Speedway stuff below. Have to keep an eye on it and order once available as it goes out if stock frequently.

I'll run it from the top of the firewall all the way back, then get a carpet with the mass backing.

No sticky stuff required.

Aluminized Heat and Noise Insulation Shield, Double Sided
 
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