Marlon

Thinking of pulling the rear seat and panels out to apply some dynamat sound deadener or thin sound insulation. Any recent experiences to share in this reagard - yes, I have been using the 'Search' function

AOW162435

Listening to the sweet sounds of the flat six are one of the best parts of the drive - for me.



Andreas

RallyJon

First, theoretically: Do you know how sound deadening/absorption works? If you're not already very familar with the subject, do some reading first. Dynamat is often used incorrectly.

Second, practically: Your car has a very good sound pad already that is bonded to the metal. It deadens and absorbs sound really well. It will be a messy project to remove that, install your own concoction of deadeners and pads, and put your car back together. And unless you're prepared to install hundreds of dollars and tens of pounds of aftermarket products, it won't be much quieter than before.

901aero

RallyJon is right. I've used the Dynamat stuff in street rods and other cars and while it CAN be effective it IS heavy and installation on your 993 is unfeasible.

texas911

The carpet on the 993 is glued on isn't it? Major work to take it out.

NP993

I have stock cats and mufflers on my car, and the engine is barely audible when you're cruising around town. Any quieter and it'd be a Toyota Corolla. What exactly are you trying to accomplish?

Marlon

I would use the dynamat to deaden sound and would use insulation to 'stop' sound waves emanating from their generation point to my ear. My experience with the solid, heavy Dynamat is that it works best when used to dampen frequency propagation through solids (panels,etc). That's why you don;t see aluminum bells generally - aluminum does not propagate shock wave like steel, etc. As a matter of fact, most of you know that the 993 valve covers are PLASTIC. Plastic is a teriffic sound insulator - recall that the 993 was designed not only as a kinetic performance machine but also as a high performance machine that REDUCES noise emissions during it's designed performance duty cycle. Plastic valve covers will absorb valve train noise: wa-la huh. Insulation works best when used in the correct manner as well - to absorb sound frequencies.
Anyway, the only 'noise' coming from the back that bugs me, is the sound of the rear tires. Love the sound of the motor though. But the 265 P-zeros have a sort of 'beachball boing' sound ocassionally - you can sort of 'hear' the air sometimes. The tires don;t make any appreciable 'road noise' per se - it's just the 'boing' sound of the tire. I think for what I want to do, it more or less relates to the rear wheel arch areas. I wil lhave to get in there to take a look at the environment - might not be worth the effort.

95FL993CAB

I would suggest you change the tires before through the trouble of insulatiing parts of the car that may or may not affect the sound that bothers you.
Take care
Ron

ed devinney

+1 - is there something wrong with the factory sound deadening?

More seriously, go after tire choice first if that's the sound you don't like. Remember, though, the 911 is a sports car and not a Lexus.

The Brewmeister

+2 The tires are your problem. Reviews on Tirerack.com (no affiliation) usually mention tire noise
as part of their review. Check it out, there is plenty of interesting reading there.

Dan V

I removed my sound insulation from the rear foot wells and behind the big vinyl panel behind where my rear seat-back used to be. It wasn't difficult to do; I love the engine noise, haven't noticed much tire noise (Conti Sport Contact 2), but Mrs. V goes into a panic every time I floor it

Marlon

Actually - now that I think about it, maybe RSR's or LPMMs are the real answer. Keep my muffs for posterity. Don't even have to deal with sound crap adn my tires will be soundless:^)

Amfab

oy

djames

Sounds like a better plan to me. (No pun intended)

Marlon

Woo - woo! Wonder if FisterD can do muffs from the East Coast:^)