What are these?

BigDaddyLS

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I am currently dynomating my whole vehicle and i came across under the back seat two large gromet looking circles and i was wondering what their purpose was.
 
the fuel pumps are located under the groumets.that is if you are talking about the rear lower seat cushion.about the size of a small plate.
 
Thats weird i just got done dynamatting my car as well.. lol.. What one are you using, i use the stigner roadkill extreme and well needless to say and a few hundred cuts all over my hands, recommend using gloves the aluminum backing cuts like a razor.. I take some pics to show.. I will be posting some pics of the install thats going in the ls.. soon for those that was kinda keeping up with my progress.. lol.. My first post on this forum a few months ago was asking if a double din would fit.. And well This saturday we are putting in the head unit that just came in..
 
Oh and another thing one my i cut around all the gromments just to be safe, and its a little difficult too if you cover the small holes that everything pops back into also.. I only did that once, if you clear the holes as you go you won't have to rememer everyone single one of em.. lol
 
I know some people so I can get stuff cheap, but how hard was it too install, and what about the benefits. Are almost all rattles gone?
 
I don't understand why people think they need to dynamat the entire vehicle.

I agree that a certain amount of the stuff will reduce road noise, but if you're planning on putting on an intake, exaust, and a killer sound system, what good is the reduction of road noise.

Dynamat is great for reducing rattles but that only takes very little of the product. Only in specific places like where two pieces of metal may vibrate together or possibly resonate.

In my 96 ford bronco I had 8 15's walled off behind the seat and I only used one regular sized box of offbrand "dynamat" in small strips to deaden the entire vehicle. It may take a little more for a car b/c the roof and trunk lid tend to resonate. 80% of my roof was fiberglass and no trunk. But covering the entire floor in my oppinion is a waste of time and money. :soapbox:

The best way to dynamat is to put some good subs in the car and see what vibrates. Then fix each little vibration. Some vibrations can't be fixed by using dynamat others you could fix with some good ole duct tape. It may be red neck but it works and costs less.

Just my opinion and you know what opinions are like.
 
MikeB said:
I don't understand why people think they need to dynamat the entire vehicle.

I agree that a certain amount of the stuff will reduce road noise, but if you're planning on putting on an intake, exaust, and a killer sound system, what good is the reduction of road noise.

Dynamat is great for reducing rattles but that only takes very little of the product. Only in specific places like where two pieces of metal may vibrate together or possibly resonate.

In my 96 ford bronco I had 8 15's walled off behind the seat and I only used one regular sized box of offbrand "dynamat" in small strips to deaden the entire vehicle. It may take a little more for a car b/c the roof and trunk lid tend to resonate. 80% of my roof was fiberglass and no trunk. But covering the entire floor in my oppinion is a waste of time and money. :soapbox:

The best way to dynamat is to put some good subs in the car and see what vibrates. Then fix each little vibration. Some vibrations can't be fixed by using dynamat others you could fix with some good ole duct tape. It may be red neck but it works and costs less.

Just my opinion and you know what opinions are like.

its not for road noise... my guess is he's doing everything possible to gain db's on his system... :F

theres a technical reason for dynamating the whole car.... i just dont feel like looking it up... maybe someone will do the honors...


oh but, you are right if your just trying to cut down rattle, it is a waste to do the whole car... one piece of dynamat between the license plate and trunk will do. when i had my 15" back there, i used double sided 3m foam tape on all sides of the license plate to hold it down. dynamat wasnt cutting it.... i also drilled 2 new holes into the car so that i could have all 4 screws holding down teh plate... believe it or not, that double sided velcro/foam tape holds the plate down beautifully! :Beer
 
Dynamat and Dynamat Extreme suck testicles. Second Skin is the best!!! And its a lot cheaper. When sound dampining the whole car you are not only getting rid of vibrations, but you are setting a standard resonant frequency which will reduce all noises. The reduced noises will yield a higher SPL in most instances and everything will sound much nicer.
 
Hey I have been thinking about putting that stuff in my Chrysler to reduce road noise. Is it really a waste of money? The trunk is just bare empty metal, and there is no bulkhead between the trunk and passenger compartment except a piece of cardboard and the back seat. I had also planned on doing the interior floor.

It's also a 40-year-old convertible with an unlined top.

I don't have a real stereo in it, just a circa 1998 Pioneer deck pushing 4 speakers, so this is the least of my concerns.

Looking at their web site, it's $170 for 40 sq. ft, and that wouldn't even do my whole trunk. I'd probably need 100 sq. ft. to the tune of $420. Waste of money or good idea?
 
Dutch said:
Hey I have been thinking about putting that stuff in my Chrysler to reduce road noise. Is it really a waste of money? The trunk is just bare empty metal, and there is no bulkhead between the trunk and passenger compartment except a piece of cardboard and the back seat. I had also planned on doing the interior floor.

It's also a 40-year-old convertible with an unlined top.

I don't have a real stereo in it, just a circa 1998 Pioneer deck pushing 4 speakers, so this is the least of my concerns.

Looking at their web site, it's $170 for 40 sq. ft, and that wouldn't even do my whole trunk. I'd probably need 100 sq. ft. to the tune of $420. Waste of money or good idea?
If your plan is to get rid of road noise, an offbrand "dynamat" will work to a point. My comments where more toward the people (like myself) who can barely hear the road noise over the stereo and othe performance mods.
A bare mettal floor can benifit from small (1ft) squares of dynamat to reduce resonance, but most newer cars already have those small oem pieces.
I wouldn't spend more than $100 for the problem areas.
 

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