I have seen tons of posts for what type of insulation to replace the fuzzy stuff on the engine side firewall with. I need something for the inside of the trunk that's fairly thin and will insulate well.
Doing the engine swap to the 3800, the exhaust system runs really close to the trunk wall and it gets really hot in the trunk. Any suggestions on some type of insulation that will work? There's lots of thin types of insulation for flooring and such, but not made for this much heat.
Dynamat makes a product called Dynaliner. A 1/2 inch thickness is suppose to give you a 150 degree difference. It comes in 1/8 (part 11101), 1/4 (11102) and 1/2 (11103) inch thicknesses. Each sheet covers 12 sq ft. I have not tried the stuff yet but I have heard great things about it.
West Coast Fiero sells a precut foil type firewall insulation. This type of product may also be available from Lowe's, Home Depot, hardware store, etc. I have used it on two cars with 3800 SC engines, a turbo 3.4. and a 383 V8 install. You may also want to consider insulating your trunk to minimize heat transferred to that area. It should take about 20 square feet after the cutting and fitting (unless you are a lot better at it than I am). I also installed a SS heat shield between the trunk and muffler but your exhaust system design will dictate what you need to do in that area.
Thanks for all the ideas. The Dynaliner looks like a good option. I am going to take the trunk carpet out, and insulate the engine side, and put the carpet back in.
I honestly never knew there was a heat shield meant for the trunk. My car definitely did not come with it still in place.
Ideally, I would like to have the heat shield, and then the insulation on the inside.
A shiney stock heat shield (if there is room) and a self adhesive foil behind the heat shield facing the engine on the engine side of trunk wall will do wonders to keep trunk temps down. Keep an air space between heat shield and trunk wall.
[This message has been edited by olejoedad (edited 07-21-2017).]
I cut the trunk out in mine for the 3800 swap. Took the heat shield like someone did above, double wrapped it in header wrap with some self tapping screws. Then I took the bottom of the trunk I cut out and flattened it. Then bought some thermo tec stuff from jegs: http://www.jegs.com/p/Therm...rier/750869/10002/-1 and put it on the bottom of that and the top.
Then I ended up getting the "peel and seal" roofing material stuff from Lowes and lining everything inside. Then cut the stock carpet and put it in to fit.
I just took a 5 hour trip to Detroit in 85 degree weather, stop and go traffic and the temps never got above 115* in there.
I'm actually able to fit two chairs, a small tool bag and a few other things in there without having it catch fire .
If anyone's interested I can take some pictures tonight when I get home.
I used MightyMatt 1/4" insulation, Foil on both sides, found on Ebay. Does a great job. I sandwiched mine between the stock heat shield and the outside of the trunk- better to keep the heat out of the trunk, rather than trying to insulate on the inside- once the heat is through the trunk skin it will stay there no matter what. For this product, there was very litle diference between their 1/4" version and 1/2" - so I went with the 1/4". Also used on on the firewall side, and also used it to wrap some of the wiring harness.
I used this on the interior cabin, and this on the interior of the engine bay(firewall+trunkwall) and used it on the inside of the trunk. Noise was significantly reduced in the cabin, and the trunk didn't get above 85 degrees on an 8 hour trip. It also fit perfectly underneath the stock heat shields and didn't interfere with the exhaust. Only downside was that when a mechanic used heat to get a stuck bolt out of the exhaust, some of the insulation melted off(although he effectively left a propane torch on it..).
For the price, this stuff is incredible.
[This message has been edited by Threedog (edited 07-21-2017).]
Thanks for all the ideas. The Dynaliner looks like a good option. I am going to take the trunk carpet out, and insulate the engine side, and put the carpet back in.
I honestly never knew there was a heat shield meant for the trunk. My car definitely did not come with it still in place.
Ideally, I would like to have the heat shield, and then the insulation on the inside.
I mounted mine on the inside but sandwiched a piece of heat insulating material between it and the trunk wall which was also treated with Lizard Skin CI (Ceramic Insulation) and then put the stock carpet back in.
Look at the Second Skin Audio site and check out the Damplifier Pro which is what I used on several different cars with good results. Their Heatwave Pro also looks good but I have not used any as of this date.
With my full 3800SC exhaust system, I retained the heat shield but the trunk temps were still getting pretty hot. It was detrimental when I carried a small ice cooler in there. One day at the local dollar store I saw a windshield sun shield. It was made from a foil covered heat insulating material. I lifted the carpet on the trunk side and cut the windshield sun shield to size with a scissors with an opening for the light . Placed the shield against the trunk wall (facing the engine) and put the trunk carpet back. Trunk is now remarkably cooler. Total cost $1 and ten minutes of work.
------------------ " THE BLACK PARALYZER" -87GT 3800SC Series III engine, custom ZZP /Frozen Boost Intercooler setup, 3.4" Pulley, Northstar TB, LS1 MAF, 3" Spintech/Hedman Exhaust, Autolite 104's, MSD wires, Custom CAI, 4T65eHD w. custom axles, HP Tuners VCM Suite. "THE COLUSSUS" 87GT - ALL OUT 3.4L Turbocharged engine, Garrett Hybrid Turbo, MSD ign., modified TH125H " ON THE LOOSE WITHOUT THE JUICE "
[This message has been edited by Dennis LaGrua (edited 07-22-2017).]
What olejoe said.. head sheild and reflective on the outside of the trunk. I also ended up wrapping my muffler with a muffler wrap heat shield as well.
I mounted mine on the inside but sandwiched a piece of heat insulating material between it and the trunk wall which was also treated with Lizard Skin CI (Ceramic Insulation) and then put the stock carpet back in.
In addition I also Titanium wrapped my Crossover
And my Muffler
Some people choose to go with this instead of Titanium
I had no clue there were so many options!. Thanks for all the advice! It is much appreciated.
I also titanium wrapped my down pipe, as well as the actual muffler. The wrapped muffler servers 2 purposes. One, help with heat in the engine bay, two, reduce the drone of the muffler while cruising on the highway.
Lots of options out there, some better than others. I recommend Hushmat, as it is a thermal blocker as well as sound deadener. Most foil lined mats such as Dynamat are for sound reducing only, FYI.
I also titanium wrapped my down pipe, as well as the actual muffler. The wrapped muffler servers 2 purposes. One, help with heat in the engine bay, two, reduce the drone of the muffler while cruising on the highway.
Did you drive the car before wrapping the muffler? How much did it reduce drone?
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