phatboypimp

Out of all of the cars I have owned in the recent past, my C350 has the worst road noise. I know a lot can be said about tires contributing to road noise, but I find it intolerable driving on the freeway (especially because if I am in my car I am usually on the phone via bluetooth).

Has anyone installed a sound supression material such as Dynamat? If so, where did you apply it? I am thinking about the doors, trunk and floors to begin with, but I would appreciate any lessons learned by others.

My buddy just installed dynamat on his Prius and went out of control with the stuff and basically did every surface of the car including the roof. I know there is some weight that comes with the product, so I would like to put it where it will be most effective. Any advice is appreciated.

jctevere

Well I know that under the floor there is VERY thick insulation from pulling up my mats. I don't know how much road noise supression you will gain from there, but it seems logical to install it there. I find that much of the road noise comes from the creases such as dors and windows. But mostly I hear things in the trunk, that back needs more insulation IMO.

Sportstick

https://mbworld.org/forums/c-class-w...d-you-use.html

Read this thread, especially posts 14 and 29.

phatboypimp

Very helpful thank you.

Anyone heard of http://www.cascadeaudio.com/?

C300Sport

I just installed a WeatherTech mat in the trunk and it has cut down a significant amount of tire and exhaust noise...the first day I had it in, I noticed the faint whine of the manual gears for the first time so the noise reduction had to be more than the simple fact I "wanted" it to be quieter.

Carsy

Roads may be constructed of coarser material in the USA compared with Europe. I notice the amount of road noise depends on the road topping.
It would be cheaper to insert foam earplugs !

albert101

Try changing your tires first before you start putting noise dampening material all over the interior of your car. I used to have Dunlops on my car. They were really noisy. I then changed to Michelin Sport Pilot 2 tires and the road noise was significantly lower. Of course you will still hear it but it was MUCH better than before.

Check www.tirerack.com and look at the tires that have the lowest road noise on their rating system. You'll be surprised how much of a difference it can be. Hope this helps!

Derspeed

^ Yes, try the tires. The quietest and longest lasting tires I have ever owned are Pirelli PZero Nero M+S. They perform as well as and maybe better than the OE Contis (which I hate).

Yesterday I noticed that on a newer concrete highway my tires were ridiculously loud. On asphalt and grooved concrete they were pretty quiet.

I thought it was just me. It really does seem like I hear the traffic around me way more in my C than in any other car I have owned. Because the noise is less noticable with the sunshade closed, I am going to assume that a lot of the traffic noise is coming through the roof.

GMBZ

I too was surprised at the amount of road noise in my new C class. I previously had an E also with 18" wheels and it was significantly quieter even with tires with over 30K miles on them compared to the brand new C. So, yeah, the C does not have good sound insulation.

Sportstick

+1

But, the real Achilles Heel is the plastic spare tire tub, which is quite an amplifier. Work on that first, and see the significant improvement possible.