i have an 84 with stripped interior, im currently at 2100lbs and wanna get lighter so im wanting to remove the tar sound deadening, so does this serve any structural purpose or is it all for noise reduction.

if its just for noise i will be removing it with dry ice as i heard this is the most effective way.

 

just noise reduction.

 

Yep just for noise/heat. Expect to save about 40lbs if you remove it all.

 

Great thanks both of you for the quick response and only 40lbs looks like alot more then that in the car but dry ice is about 98 cents a lb so guess i willl be buying some, has anyone done this and know about how much dry ice i need to buy? i have to drive 45 minutes to get dry ice.

 

I saw an instructional video on Youtube. Worth a quick search to see how it's done.




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I have done it!! It was easy but be prepared to use a lot of dry ice. I took dry ice and broke it in small pieces all over the floorboard. Use a rubber mallet to smash the ice into smaller pieces to aid in coverage.

Then take the rubber mallet and bang the hell out of the floorboard. It pops up super easy. It took me about an afternoon to remove all the tarboard.

I DON'T really think I pulled 40 pounds out, but maybe 15-20# of total weight.

 

Also if you put your dry ice in a closed ice box (like a igloo lunchbox). it will stay cold for days. Notice where you buy dry ice it is only a cooler box.

 

I chiseld all the deadner out of my 74 Rx-4 and kept it all to weigh it, it ended up weighing a hair over 50lbs, so 40lbs probaby not to far off for a 2 seater.

 

i think its going to vary a bit car to car

 

HOw much is alot lol like 40lbs 80lbs or 100lbs what??

 

I pulled ALL the flooring tar off, all the tar behind the front seats as well as all the tar in the back around the spare tire. Also all the insulation (non tar) on the firewall. I weighed it all... It was 20# in a 84 GSL.

20# is still 20#!!! Do it and weigh it. You will see I am right.

 

How many pounds of dry ice did it take and when i say stripped i mean stripped the tar and dash pad, steering wheel and shifter is all thats left lol

 

Interesting. But my next question is, does there exist a lightweight alternative to this tar of which we speak? Hmm, I am wondering...

 

prolly dynamat, and still trying to figure out homw much dry ice to buy lol

 

Yes there are lot's of good lightweight sound deadening alternatives. The modern stuff quiets better and is much lighter than the old stuff we are removing.

There are sprays, mats, all sorts of stuff. There is a pretty good thread in the detailing and restoration section.

 

I worked in a car audio shop for years. We used Second Skin brand sound deadening stuff. Very good, but the other brands are quite good too.

We usually had kids wanting louder bass with less rattle, but occasionally we'd get a customer with a sports car who wanted a lightweight sound deadening solution for a daily driven racecar. It worked out well. There are different materials that work better for different frequencies of sound control and for different problems. Very interesting exercise in acoustic physics

 

I wonder if its a yearly thing... I pulled all the tar out of my 83 and it was definatly closer to 40lbs. maybe they used different stuff on the 84/85 cars?? Who knows, will be curious to see how much weight he comes up with though.
Also, I used a hammer and chisel on a cold day, didn't bother getting dry ice

 

i have access to air chisels i wonder if that would just do it? and ill prolly be doing it this weekend

 

I used about 5 pounds of dry ice. I would definitely do it this way. Air chisels are not needed! If you do it with dry ice, it does not bang up your metal!

 

I'm sure the dry ice method is the best. i would not use an air chisel, too much risk of tearing through the sheet metal. I used a old dull chisel and made sure it was angled quite a bit when striking it so there was little risk of denting/cutting the floor. In the case of both my 83's it was coming up in fairly big pieces without dry ice, so i'm sure with the dry ice it would be even easier.

 

air chisel will got right thru the floor!

 

figured was just throwing it out there lol, so only 5lbs of dry ice??? i was thinking more like 20+

 

since you helped me in my thread, I feel obligated to help you in yours.
http://www.youtube.com/watch?v=Fbb5dD98b5s

 

Dry ice, bare hands, claw hammer, flip-flops... clearly professionals at work, heh.

Wonder why he didn't use the claw end to rake the tar loose, instead of his fingers?

For those who haven't messed with dry ice: Use gloves to prevent burns (-100f, you know - will frost-burn uncalloused skin almost instantly) and make sure you have decent ventilation because the dry ice sublimates into odorless CO2, which being heavier than air will collect in low areas, and can lead to hypoxia if it gets too highly concentrated. Can sneak up on you fast, especially when exerting yourself.

 

More would be better since I really had to use it lightly. This stuff is super cold... It don't take much!