Does it make a difference: sound deadening insulation?

[Super Blue 72]

Just wondering for those who have put in some sort of sound deadening material like Dynamat, does it make a big difference if you drive with the windows open?  Is it worth it?  Just curious.  Thanks in advance. 

[Slotts]

Hey Phil,   

I think if you have an A/C car, it might be worth it, but otherwise I don't see the need for it. Like you said with the windows open all you want to hear is the roar, right? 

Slotts

[Super Blue 72]

Hey, Jim! 

Thanks for the reply!  Yeah, no AC for me.  I have the interior out and was hopefully this spring put it back in and didn't know if I should do the insulation route.

One big issue is that I will sometimes get water inside the car from a hole in the cowl somewhere and figure if I have less stuff under the rug, the quicker it will dry and not hold moisture.  Yeah, so probably best no insulation stuff.

Besides, I need the windows open to listen for parts falling off the car.      

[Final Challenge]

I'm looking into using Lizard Skin to insulate from heat and sound. It is spray on and sandable.  You can also paint over it.

[Jesus H Chrysler]

One of the things the undercarpet insulation does is reflect heat from the exhaust to keep the interior cooler.  My Challenger has a 440 with headers and it gets really hot from underneath.  It also deadens the sound reflection from the road.  My car had turndowns after the mufflers before the axle for a little while.  Even with the top down the noise in there was horrendous.  I put the carpet in loosely and it quieted down some.

To calm your leak fears try this:  Put a small hole in the dynamat or whatever you use right over one of the factory body plugs in the footwell.  Then put a few pinholes through the plug to allow any water that collects to escape. If you get the foil lined dynamat it will act like a barrier between the moisture and the metal of the floor.  I know it's just a stop gap method until you get the moisture problem figured out, but it will help you with your short term problem.

[Super Blue 72]

Thanks for the input guys! 

Lizard skin?  Interesting, I'll look into it.

Thanks for the tips, JHC.

 

[dodj]

I've always thought the sound of these cars is part of the character, but I agree with JHC, the exhaust really heats up the floor. I'm thinking of putting some just on the area between the seat and firewall. 

[mojavered]

Besides, I need the windows open to listen for parts falling off the car.      

  I like it!  I just went to the fabric store and bought that aluminum sided wool stuff by the yard.  It was cheap, maybe 30-45 bucks for the whole car.  I have just enough to do my roof.

[Super Blue 72]

Yeah, the sound of these cars is like music to our ears. 

Aluminum sided wool stff?  Sounds interesting!  I'll check it out! 

[dutch]

I love the sound too, but I don`t care for resonance in the bodypanels. Stuff like dynamat eliminates it pretty good.

[JoltinJoe]

Besides, I need the windows open to listen for parts falling off the car.      

Holy Christ I thought I was the only one... 

[Strawdawg]

sound deadner does not stop the noise...it changes the characteristic by changing the resonance of the panel

[johns cuda shop]