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texican

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Discussion starter · #1 ·
Not to beat a dead horse once again but I think I got some decent results on wifey's new car, an 09 V6 Coupe w/Navi,white.

This car is the first new car we have had in decades,(raising and educating 3 boys with house payments puts a crimp in the new car department). Loved the looks and the way it drove but we did not test drive on anything but nicer, smoother, newer roads. After purchasing we discovered the thing was absolutely awful with road noise on less than stellar roads.

Here in west Texas all our roads are asphalt and every few years the do what is called "seal coating" in order to extent the life of the roads. Seal coating consists of putting down a nice thick layer of hot tar and laying a fresh coat of gravel, level and compact. It creates a very porous surface that makes a coupe howl like a drum, driving this old man crazy.

The first thing I did was put a clear bra kit on the front and make the standard homemade Home Depot lower grill.

Then, last weekend I attacked the road noise problem and think I achieved some success. Here is what I did:

1. Sprayed 1 gallon of a product Quiet Car under the seat pans and inner front fender wells.
2. Ripped out her trunk, rear seat, and front seats. (she just about died seeing her new baby tore all apart!)
3. Applied 1/4" neoprene foam on the inner trunk side liners both sides and bottoms of these liners. As well, applied it to the bottom of the spare tire cover, all of it.
4. Applied to inner trunk lid under the cover.
5. Removed rear seat side covers and applied foam to outer fender panels as well as the inner of the plastic panels themselves.
6. Applied misc. shaped pieces under the rear seat.
7. Applied double layer to door outer panels and misc areas of inner plastic panel as well as covered the two huge holes in the door inner sheet metal.

Results: On my seal coated test road the DB ratings at 70 MPH dropped from 75 to 68. On the nice, recently repaved interstate it is deathly quiet. And my #3 son said he noticed right away on start up the difference because he hardly knew the engine was running. The stereo sounds so much better and the doors go "thunk" when we close them. A conversation is conducted at real normal levels and the broad (no offense to you gals out there) on the Navi understands me now.

In addition I installed the sheepskin seat covers when I had the seats out during this process. That light tan color was awful to keep clean and it is hotter than hell here in the summer making me sweat just as bad as if it was vinyl, in time it would ruin the leather. Oh boy, do the sheep skins feel good too, improving the rather firm Honda seats.

No, I don't have pics, this ole guy is still trying to figure out how to use his Cannon 35mm SLR. So me with digital pics??? Haha.

Total cost: About $225 for the sound deadening, maybe another 25 for trim tools, spray glue and carpet tape. I used the spray glue sparringly cause wifey does not like the stink and the carpet tape works great, just make sure it is positioned correctly the first time. I bought 6 sheets of 1/4" neoprene off Ebay and had just enough, barely.

If I had it to do over I would have put more in the front section of the rear quarters. I was concerned about having enough and was a little too conservative.

Enough for this long a$$ed thread.

PS-If I can talk the wifey into some Bridgestone Serenity's we will have a really, really nice quiet coupe. But I have a feeling we will have these damn Pilots for awhile. She bought the car on June 2nd and has a whole 1500 miles on it.
 
Great post! though pics would def. be nice! this is a good write up... my only complaint as well is the road noise... although i don't even know what to say anymore... there are times when the car seems sooo quite i can't even tell its on while on the freeway... and other when i feel like i'm driving a tractor when/if i ever have the time and place to do some of the noise reduction you've done at least i know it'll help...
 
Great Info

I have an 09 six speed also and after trading in a Mini Cooper (you want road noise - the Cooper sounds like you're in a rock crusher) I was pleasantly surprised at how quiet it is. I live on an island where they chip-seal the roads as well. But even the newest application of tar and gravel isn't that objectionable.

However, I still might tear mine apart as you did and make it quieter. Did you get special sound-deadening foam or was it just regular stuff? I know you can buy stuff with a lead sheet that supposedly attenuates sound greatly.

Thanks,
Den
 
Nice ideas...Enjoy the coupe as I do :yes:
 
Discussion starter · #6 ·
I used the regular neoprene foam, not even the sticky, peel off back. Got 6 3'X4' sheets off Ebay for 90 bucks. One side is smooth skinlike and the other is porous so I glued on the slick side, leaving the porous side to absorb noise. I decided to try to soak up the noise instead of using Dynamat mass dampner.

As to the sheepskins, when I ordered them I specified for side airbags and they come with a velcro attached flap that flips up if the airbags go off. They are marked "driver or passenger side" so you have to pay attention upon installation.

The neoprene foam only added maybe 15 lbs. to the car, does not burn as bad as synthetic or plastic foams. I had used some many years ago on an old VW Beetle for sound deadening with good success.
 
Great ideas and methodology as an answer to sound control and dampening, I am sure others will also do same, maybe adding some additional innovative steps also. Regards

Richard
 
we want pics we want pics!
 
Going from 75db to 68db is a significant improvement. I believe that is LS460 territory, let alone on a course road with noisy Michelin tires. I have had enough with the stock tires so I switched them out at 30K for a set of Serenity. Man, let me tell you, it's surprising to hear and feel the difference of a good set of tires will do. Maybe down the road I will have the courage to tear the car down to apply acoustic isolation stuff. I'm very happy with the car's acoustic performance at this point.
 
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