Looking for someone who’s done it with ’08 sedan. I read posts on ’07 accord but want the 8th gen. experience. This is my first accord and road noise is unusually high for me. Any info you can provide is much appreciated.
thanks.

I've done it on my coupe. 3 layers on each door, and trunk.

Dynamat isn't going to reduce road noise much. It reduces panel vibration well, but that isn't what causes the majority of the noise in our cars. Honda has even put vibration dampening over the wheel wells. If you really want to reduce road noise, the most bang for the buck is going to be new low noise tires. If you want to get into absorbing noise, you'll have to find some good layer/barrier noise reduction materials such as second skin's luxury liner pro, combined with a layer of dynamat-type material.

The main reason to do Dynamat is to preven your panels from vibrating from your speakers, causing backwaves that will cause distortion.

http://dynamat.com/products_automotive_dynaliner.html

Your best bet is to get new tires, the Michelins that come with the car are very hard.

here's a chart from tirerack.com that ranks the "noise comfort" of the original equipment Michelins to other "grand touring" tires. The tires are sorted by the "noise comfort" with the Michelins coming in 3rd from the bottom.

http://www.tirerack.com/tires/surveyresults/surveydisplay.jsp?type=GTAS&tireSearch=true&width=225/&ratio=50&diameter=17&speed_rating=H&speed_rating=V&speed_rating=Z&speed_rating=W&speed_rating=Y&speed_rating=(Y)&autoMake=Honda&autoYear=2008&autoModel=Accord%20Sedan&vehicleSearch=true&autoModClar=EX-L%20V6&VT=null&sortValue=12

http://dynamat.com/products_automotive_dynaliner.html

My suggestion is the link above (Dynaliner) for the floor - you can probably put it under the driver/passenger mats up front and get good results....

And also:
http://dynamat.com/products_automotive_hoodliner.html

Add this under the hood for reduced engine noise.

Dont buy from the Dynamat website...you can find it for 50% off elsewhere.

Hondas are noisy b/c of their suspension set up and sound deadening (SP?). Adding insulation under carpet and in doors will help some, but Honda's engineering is why your car was noisy.

*I had more road noise in my TL than I do in my truck.

Also, those tires are noisy, so quieter ones will help.

Hondas are noisy b/c of their suspension set up and sound deadening (SP?). Adding insulation under carpet and in doors will help some, but Honda's engineering is why your car was noisy.

*I had more road noise in my TL than I do in my truck.

Also, those tires are noisy, so quieter ones will help.
I tend to agree, I think alot is how well the suspension is isolated from the body. this means sub-frame/control arms bushings and the rest of movable suspension links.
One thing to note, the more you isolate suspension the less feedback and generally less responsive it will feel.

I got that undercoating done at the dealership thats supposed to reduce road noise by 60%. Dont know if thats true, but definately look into it.

unxder coating works but I will say if you have Navi or bluetooth the redeeming factor is dynamat helps alot of the ambient nose go away as well cars driving by outside trucks etc... im going 3 to 4 layers on the doors quarter panels 1 on the roof 3 in the trunk..3 on the floor then covering the floor with a vinyl so that the dynamat stays away from the cartpet panels and cables Its a mess to clean once there.. the only thing I found that gets smudged dynamat out of anything is rubbing it with a dab of gasoline sing both are basically a petrollium based item..

unxder coating works but I will say if you have Navi or bluetooth the redeeming factor is dynamat helps alot of the ambient nose go away as well cars driving by outside trucks etc... im going 3 to 4 layers on the doors quarter panels 1 on the roof 3 in the trunk..3 on the floor then covering the floor with a vinyl so that the dynamat stays away from the cartpet panels and cables Its a mess to clean once there.. the only thing I found that gets smudged dynamat out of anything is rubbing it with a dab of gasoline sing both are basically a petrollium based item..
So what your saying is sounds like trucks and cars passing by type sounds are being hit on outer skin ofthe body panels and transfer then to inside.
The only thing I would be concerned about with putting anything on the outer skins is moisture and long term rust developing ?.
A least in the doors as water does get in there and needs draining.

Thanks for all your comments. I have EX-L V6 Sedan Blackhawk Navi/bluetooth leather the whole works I guess.
I will start with new tires then. While at it, I will replace my wheels as well. Off topic - what do you guys think of tirerack and or discountires less expensive brands they carry like Kazera KZ-S, Bremmer Kraft, Zinik, Konig, MB Wheels and Privat?
For tires I'm looking at 245/35/19 8 or 8.5 between Nitto Invo and 235/35/19Yokohama S drive.
Again thanks for all your input.

Original post 5/13/08. Updated 5/15/08 - slight change of plan.

Just a quick note to keep the post going... And thank you again for all your comments.

I have continued to pursue the challenge of reducing road noise, wind and improve cabin experience on a 2008 EX-L V6 sedan.

I purchased an Extech 407730 sound level meter to measure cabin noise. I will post pictures within the next few days.

The plan:
1) Baseline measurements at 45, 55, 65, and 75mph.
2) Dynamat Xtreme and Dynaliner on Floors, 4x doors, trunk incl. lid
3) Measure cabin noise
4) Replace OEM rims/tires with 19x8x43 ACE Manta and Nitto Invo 245/35/19
5) Measure cabin noise with new tires.
6) Maybe dynamat roof

That's it. I hope to share my experience to anyone who may want to reduce cabin noise but is reluctant due of varying opinions.

Please post an entire write up with this. This information is invaluable to those trying to get their Honda to a tolerable interior noise level.

Thanks and good luck! (FYI) If it was me...I'd start with the Dynaliner as that will decrease noise from the outside and probably is cheaper than blowing money replacing brand new tires. I hate to waste money like that.

Dynamat isn't really the greatest for the $$. Check out www.raamaudio.com and get some Raamat bxt. If you really wanna get out of asphalt based stuff try second skin but they're just like a status type deadener, very expensive. When you do your doors make sure you do the inside of them as well then seal the outerskin with some type of thin sheet metal/silicone and deaden over that. Just depends how heavy into it you wanna get.

[QUOTE=vernisog;237468]Dynamat isn't really the greatest for the $$. Check out www.raamaudio.com and get some Raamat bxt. If you really wanna get out of asphalt based stuff try second skin but they're just like a status type deadener, very expensive. When you do your doors make sure you do the inside of them as well then seal the outerskin with some type of thin sheet metal/silicone and deaden over that. Just depends how heavy into it you wanna get.[/QUOTE

___________________________:stupid:_______________ ____________________
Just fill your doors with concrete, then you can be an spl competitor like vernisog too :screwy:

or you could just claim you know everyone and claim high ass db numbers with no proof and try to get uber elite e-points with em. for someone who claims they're doing an sq setup now you obviously know nothing about deadening a door i see. you should post your bs up on caraudio.com and see how much you get flamed unless you already did and don't bother going back. see who's the "outsider" then. get back on topic.

LOL I truly find your lack of itelligence disturbing and If you Knew anything about anything.. you'd know that Gary Biggs built Alma's last Bronco before her heart surgery at 77 years old, with 42 chain driven Alternators and all JBL equipment including no less than 6 JBL ams with no less than 20000 watt amps & 18 batteries.. and the doors were filled with concrete... but obviously where ever you are in the back hills.. you havent been exposed to the true pros in the industry.... I truly feel sorry for you... so Keep Flapping your gums...

LMAO!!! And Now a word from our Sponsors! :)

Cabin Noise Baseline
Engine running idle in garage 58.5 db
45 mph = 67.1 db
55 mph = 71.7 db
65 mph = 72.9 db
75 mph = 73.5 db

No trucks passed me or I passed. The meter refreshed every 1 sec. and could jump 2 - 3 db. I will post pictures later.

Please note that these are not scientific measurements and accuracy varies so much. They are more real world experience with my driving, sound level meter and road conditions.

People were given infractions and posts were deleted to keep this thread on topic and language friendly.

Don't test me w/ the insults as you will be surprised how fast we can delete you as a member.

Baseline engine idle

Baseline 45mph

Baseline 55mph

Baseline 65mph

Baseline 75mph

great info!

I want to thank you guys again for your input but I've decided to use Dynamat Xtreme. My goal is not to compare and contrast different products but to reduce cabin noise on 2008 Accord sedan.

Progress has been made and here's some pictures of the work done.

Here's april strip down

oh my dear god
brave soul...hopefully no rattles once you put her back together

Progress on april, floors on dynamat xtreme. Hopefully doors and dynaliner will be done today.

Wow that rocks:dude:can't wait to see the results :)

How about the step by step on the entire teardown seats trunk and all Im going to have to do the exact same for my sound system wiould appreciate any and all data.. especially the rear dash, pillars,seats and the whole center console if applicable..

It never ceases to amaze me how bare these cars are when the liner's are removed. Absolutley ridiculous.:thumbsdow

Good work and keep us posted on the road noise; or lack of road noise hopefully when your done.

Well Any Car Without Panels, Is Bare Hence, Skin...lol

Here was my Saturday Project installing my FatMat:yes: btw. wear gloves this Stuff is like razors on the edges OUCH:yes:
http://img221.imageshack.us/img221/1796/picture014qi9.jpg
http://img292.imageshack.us/img292/8049/picture015yu7.jpg
http://img408.imageshack.us/img408/2252/picture016sm3.jpg

Very interesting and can't wait for the final results showing the sound meter values. I just purchased an 08 Sedan EX-L V6 and although the car is very tight with virtually no rattles, I'm a little disappointed by how much road noise there seems to be at higher speeds.

I will post my result soon. I ended up upgrading my sound system and the ANC caused much headeache. I had the pulsating bass problem and drove my crazy.

Final Sound level numbers.
Before and After dynamat.

Baseline:
Cabin Noise Baseline
Engine running idle in garage 58.5 db
45 mph = 67.1 db
55 mph = 71.7 db
65 mph = 72.9 db
75 mph = 73.5 db

After Dynamat and New tires Nitto Invo 245/35R19
Cabin Noise After
Engine running idle in garage 57.1 db
45 mph = No measurement
55 mph = 72.8 db
65 mph = 73.2 db
75 mph = 73.5 db

The numbers though are skewed because i upgraded my rims/tires before i could measure. I went from Michelin Pilot HX MXM4 225/50R17 93V to Nitto Invo 245/35R19. Invo claims it to be the quietest tire of their street tires, however, i don't know how it compares with Michelin Pilot HX MXM4.

I will let you decide if it's worth dynmatting with dynaliner your car for the purpose of reducing cabin noise in 2008 accord sedan. But the numbers don't lie. I hope to share this experience to all of you guys & gals who is thinking about doing this type of project and thanks again for all your input.

Salamat po!

Sound level meter pictures.

Dynamat and Dynaliner

More dynamat and dynaliner pictures.

you have to remember our cars have active noise canceling in them ;http://www.driveaccord.net/forums/showthread.php?t=18324 ; so you measurements might be affected , also Ive gone the route you have with a dodge ram i own i ended up with 3 layers of dynamatt extreme, still abit noisy . final solution is the wrestling mat looking stuff from dynamatt i think its called fat mat or something that needs to go on the floor . your car should run cooler now though ,extreme is an excellent thermo liner . also no rattles and acoustically sealed .i think the type of sound deadener [Grey] you have there is to cancel crossing sound waves or bounce back due to interior deflections , you want the wrestling mat stuff :)

Am I missing something, or the noise levels went UP (same at 75 mph) after dynamat???? Just curious.
JC

two things need to be done to save this test . you will need to park near a noisy street with the engine off and the sound meter near your head rest were your ears are ,take a measurement . then go test drive a stock accord ,park in the same place and with the mike up in the same place near your headrest take another measurement with the engine off. i think active noise canceling has compromised your test , you know i wrote this at 3 in the morning I'm reading it now and it looks kinda aggressive and dumb ,sorry . i hope you like your test but beware the active noise canceling

If the purpose of Dynamat is to reduce noise and vibration and the ANC takes care of the noise, then what really is the value of using Dynamat or its clones in these cars. The sound meter levels seem to indicate that Dynamat made no difference in the vehicle's overall cabin sound levels. With the extent of the amount of Dynamat used I would assume a cost of between $250-$500 in materials (at least). Don't really see the benefit.:dunno:
For your sake I hope there are other noticible benefits other that just the ambient noise.

I have a question related to road noise on Honda Accords. Before we bought the Accord we test drove the Accura TSX and the noise level is as quite as a Mercedes. The TSX is basicaly same car as the Accord just a comfort level version. What did they do to get the Accuras so quite.

Oh,, we loved the Accura, but not the price tag...

Does anybody know if the 6MT has the ANC? It shouldn't, since it's not VCM, but I read more than once it does. The 6MT is definitely noisier than I'd like on the freeway, but not to the point of being a deal breaker. I blame most of that to tire roar, so a quieter set of tires should bring things down to an acceptable level.
If it has it, is there a way to defeat it without other consequences? Just curious. Later.
JC

The ANC feature is not related to VCM. The I4 models (except sedan LX/LX-P) have it as well. However, on the V6 coupe, ANC is listed as a feature on the 5AT trim only, so, it looks like the 6MT does not have ANC for whatever reason...

I have a question related to road noise on Honda Accords. Before we bought the Accord we test drove the Accura TSX and the noise level is as quite as a Mercedes. The TSX is basicaly same car as the Accord just a comfort level version. What did they do to get the Accuras so quite.

Oh,, we loved the Accura, but not the price tag...

The TSX uses a lot more sound deadening material between the sheet metal and the interior plastics, whereas the Accord is pretty much just hollow.

Dynamat will reduce some noise, but not most. I know it won't help wind noise at all, because the wind gets leaks in because of the gaps that are open.
Tire will help with road noise

ANC does NOT handle road noise it handles the noise from the VCM switching settings and the 4cyl (190hp motors) exhaust noise. When you cut the ANC on the 4cyl you'd swear you had aftermarket exhaust. My buddy has an 07 SI and the exhausts sound very similar (accords i deeper).

hey guys. it sux that the dynamat doesn't do much as far as deaing with road noise. for those who do have it on, how much does it help with SQL? i have a bunch of dynamat extreme that I was planning on putting on the car but if it doesn't help then i'm not gonna bother.

hey guys. it sux that the dynamat doesn't do much as far as deaing with road noise. for those who do have it on, how much does it help with SQL? i have a bunch of dynamat extreme that I was planning on putting on the car but if it doesn't help then i'm not gonna bother.
Yes. I had it put in front doors around my new speakers an rear deck on top (need to do undernieth too) but it gets more mid bass from your door speakers the d'mat is installed.

Yes. I had it put in front doors around my new speakers an rear deck on top (need to do undernieth too) but it gets more mid bass from your door speakers the d'mat is installed.

Thats good. Thanks for the info.

Does Dynamat still have that chemical order after you apply it? If so, how long does it take for the odar to go away?

I used dynamat nearly 2 decades ago and you had to use a heat gun to apply it.

Ok this is my first post on this forum. I have a 09 v6 6sp and agree that the road noise is a little to much. I have installed many types of sound deadening material and can tell you that if you want to cut back on road noise dynamat extreme is not the only step to take. Dynamat will help reduce the noise caused by panel vibration but you need some type Noise Control Barrier. I love dynamat have used it in most of the cars i have done would stay away from the raammat quality is not as good but just my opinion, the one that i have found that works realy good is Cascade Audio Engineering they have some realy good products and if you call them up they are very helpful. And no i dont work for them.