Carpet underlining and noise reduction - DodgeIntrepid.Net Forums - Dodge Intrepid, Concorde, 300m and Eagle Vision chat
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post #1 of 19 (permalink) Old 08-03-2005, 04:51 PM Thread Starter
 
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Carpet underlining and noise reduction

I find there is a lot of noise inside the car when driving at highway speeds. I'm under the impression it is mostly coming from the tires. I am considering the possibility to put a double carpet underlining, from the junkyard, to improve the situation. I wonder if some of you have tried this or other solutions?
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post #2 of 19 (permalink) Old 08-03-2005, 06:24 PM
 
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There are noise reducing things like dynamate, or the peal and stick stuff at home depot, also lots of the noise comes from the damn intrepid seals unless you've fixed those already.
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post #3 of 19 (permalink) Old 08-03-2005, 06:30 PM
 
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I Dynamated the hell out of the floor in my old car ('94 Cavalier) and quite honestly, I didn't notice that much difference. However, once I covered the insides of the doors, firewall and other similar areas with damping material the noise level dropped dramatically. At least in that car the carpet and "padding" really killed the majority of the noise through the floor and I would assume the same for the Intrepid. I'd focus on other areas like the doors. Of course the crappy door seals don't help. I didn't really notice how bad it had gotten until people riding with me started commenting on how much road noise there was...
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post #4 of 19 (permalink) Old 08-03-2005, 10:10 PM
 
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If you can't afford Dynatmat or some product like that, you could do a cheap fix with carpet scraps cut to fit the inside of the door panels. I did this, because I'm poor, and I have noticed a significant decrease in road noise. I only did the front two and I plan to replace the front two door's weather stripping because they are more worn than the back's from more use.
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post #5 of 19 (permalink) Old 08-04-2005, 12:06 AM Thread Starter
 
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Quote:
Originally Posted by RF_Blazer
There are noise reducing things like dynamate, or the peal and stick stuff at home depot, also lots of the noise comes from the damn intrepid seals unless you've fixed those already.
I drove from Montreal, Quebec, to Lake Park, Florida recently and I had planned to get a new head unit and speakers when down there. Unfortunately getting a confirmed Florida address for eBay buying, thru PayPal proved to be much longer than expected and decided to forego with that plan. In a way, this turned out for the good for two reasons: FL is too hot to work for any length of time when not in an air conditioned environment; the noise level inside the car is way too high to really appreciate a high fidelity system at 75 mph which is my normal cruising speed. I mentioned the tire noise which is the predominant one as it becomes quite apparent when the surface changes from asphalt to ciment etc. The tires are the original ones that came with the 2004 SXT Intrepid.

You mention fixing the seals and wonder what you are referring to. I have yet to see a discussion where people suggest better ones. The only reference I've seen were from a 300M owner who got them replaced with original ones with pictures on his web site but complained about the excessive use of heat when they were installed. Do you have a reference for door seals that would be superior to the ones used by DC?
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post #6 of 19 (permalink) Old 08-04-2005, 12:49 AM
 
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In the forum, you can read much about mostly the older intrepids, my g/fs 98 has had the problem and so on, the gasket around the door shrinks, allowing for a gap, sometime you notice the seal falling, or excessive air coming through the door, best way to fix i hear is either get new seals, or pick up an extra one from junk yard or some weather striping, cut the seal, stretch it so it fits, and then fill gap with piece cut from other seal of the weather striping, I hope that may help you, though it may not be your problem, this one proves to get rid of the wind noise you get near the window line....
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post #7 of 19 (permalink) Old 08-04-2005, 12:54 AM
 
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https://www.dodgeintrepid.net/forums/...ht=seal+shrunk
that is prolly the best link i can find thats i just about the seals...
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post #8 of 19 (permalink) Old 08-04-2005, 02:06 AM Thread Starter
 
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Quote:
Originally Posted by RF_Blazer
https://www.dodgeintrepid.net/forums/...ht=seal+shrunk
that is prolly the best link i can find thats i just about the seals...
Thanks! I've just read that thread. I've had to pay attention to my weatherstripping because I've had to install an OTIS, sunshade/lighted vanity mirrors, autodim rearview mirror with a new full harness a couple of weeks after Easter of this year. This installation requires removing the weatherstripping from all four doors because the pillar covers need to be removed. They also needed to be reinstalled and I've had to pay close attention to them to do a good job. I also closely looked at them as I waxed the interior portion of my doors two weeks ago. When I say the interior portion, I mean the width aspect of all four doors as well as the body side of it.

Again, I attribute most of the highway speed noise to the tire making contact with the pavement. I noticed it particularly when the pavement changes type such as asphalt to cement, ribbed vs non-ribbed etc. On a half hour ride, you don't notice it as much as when you drive for 16 hours...
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post #9 of 19 (permalink) Old 08-04-2005, 02:19 AM Thread Starter
 
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Quote:
Originally Posted by dbaudiopro
I Dynamated the hell out of the floor in my old car ('94 Cavalier) and quite honestly, I didn't notice that much difference. However, once I covered the insides of the doors, firewall and other similar areas with damping material the noise level dropped dramatically. At least in that car the carpet and "padding" really killed the majority of the noise through the floor and I would assume the same for the Intrepid. I'd focus on other areas like the doors. Of course the crappy door seals don't help. I didn't really notice how bad it had gotten until people riding with me started commenting on how much road noise there was...
I kind of remember you mentioning, in an old thread, that carpet underlining was as effective as the specialty products and much cheaper to use... I'll pay close attention to the inside of doors and firewalls. You surprise me there mentioning you didn't notice the amount of road noise there was! Too distracted by the dancing elephants on the face of your radio? :icon_lol:
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post #10 of 19 (permalink) Old 08-04-2005, 03:07 AM
 
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Welcome, also as listed above, some sort of padding, def try doors, firewall, and kick panel area, if its the front that makes the most sounds, have you rotated tires around? something in the front might be affecting alignment of tires, causing them to push in an odd direction creating road noise, the torsion bar in my truck wasn't aligned properly, and it was riding more on the inside of one tire, and made lots of noise, adjusted properly and nothing anymore... just my total 8 cents... hehe
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post #11 of 19 (permalink) Old 08-04-2005, 03:38 AM
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On my M I used an elastromeric sheet. I got it at a roofing supply. It is used for the prevention of ice dams on roofs. It has a peel off backing and acts like Dynomat except for the foil like back is missing. I got it because it cost me $60 for a rool (300 sq ft). I did my trun, interior, doors, and such. It helped. I also used spray undercoating for areas that I couldn't reach. And finally I used expansion foam for the wheel wells and under body cavities. The wheel wells and doors are where most of the road noise comes from. The tires can make a big differance (about half the equation) also. On my car since I do not have the back bench seats the car is noiser, but with what I did it is still much quieter then when I first got it.
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post #12 of 19 (permalink) Old 08-04-2005, 10:08 AM
 
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Quote:
Originally Posted by Gilbert
I kind of remember you mentioning, in an old thread, that carpet underlining was as effective as the specialty products and much cheaper to use... I'll pay close attention to the inside of doors and firewalls. You surprise me there mentioning you didn't notice the amount of road noise there was! Too distracted by the dancing elephants on the face of your radio? :icon_lol:
I don't think I noticed it because it was a gradual increase. It wasn't like all of a sudden one day it got really loud. Just over time the seals shrunk and I've changed tires (as you mentioned they can be a huge factor in road noise) etc. and never really noticed how loud it was in the car...
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post #13 of 19 (permalink) Old 08-04-2005, 04:52 PM Thread Starter
 
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Quote:
Originally Posted by RF_Blazer
Welcome, also as listed above, some sort of padding, def try doors, firewall, and kick panel area, if its the front that makes the most sounds, have you rotated tires around? something in the front might be affecting alignment of tires, causing them to push in an odd direction creating road noise, the torsion bar in my truck wasn't aligned properly, and it was riding more on the inside of one tire, and made lots of noise, adjusted properly and nothing anymore... just my total 8 cents... hehe
I have a set of winter tires that I purchased in mid November and reinstalled my mag wheels with the original tires in May. As for wheel alignment, I'll say I've had more than my share of problems with that with my previous cars. Finding a good place for wheel alignments is rather difficult and a matter of trial and error and can get to be rather expensive if you don't find a good place soon. It took me six places before finding a good one on my previous car (1989 Taurus SHO) and even the Ford dealer did not do a good job after two attempts... Tire sets were lasting about 12K miles with H speed rated tires! I was not even driving hard and my rear tires were getting bald on the inside rather fast to the point of wires coming out of what thread there was left. On my first new car, I went to 4 different places before it was discovered there was a bent rod originating from a towing after getting stuck in a snow storm. Heard of alignment mechanics getting a cut from the recommandations to change parts?

I bought my 2004 SXT used August 5th 2004 and the car had 16250km (bit over 10K miles) and had been properly aligned. It now has 29962km.
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post #14 of 19 (permalink) Old 08-05-2005, 11:46 AM
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Quote:
Originally Posted by RF_Blazer
the gasket around the door shrinks, allowing for a gap, sometime you notice the seal falling, or excessive air coming through the door, best way to fix i hear is either get new seals, or pick up an extra one from junk yard or some weather striping, cut the seal, stretch it so it fits, and then fill gap with piece cut from other seal of the weather striping,
When I removed my weather stripping to install my OTIS I made sure the weather stripping was stretched enough to fill in the corners so there were no gaps. My dad who has a 2000 Concorde LXi commented that his weather stripping was not fitting snugly, I removed the sill plates and just re-fitted the strip to make sure it filled the gap, problem solved. I also used some silicone spray on the weather strip to keep it soft. If there's a gap left under the sill it shouldn't cause a problem.
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post #15 of 19 (permalink) Old 08-05-2005, 02:30 PM
 
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See my post and pictures in audio/video about deadening sound.. most of your road noise will come through the doors.. this is a great place for Dynamat, if you cannot afford Dynamat I will sell you some of mine for cheap-you don't need much.. many people think that Dynamat must cover every inch of the car like heat insulation, it does not.. 1 inch of it deadens 6 inches.. so you only really need patches.. let me know if you need some..

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