"I talked to the service manager at my Infiniti dealer, and he commented that they did not put in more sound insulation b/c of weight. BS"

oh that stuff's heavy alright... granted most of us wouldn't notice the difference, but it will make a difference in times. And a few tenths of a second can mean a lot to a lot of people.

Either way, this car is (relatively) cheap, so I'm not complaining.

And in addition to that cascade stuff, I hear b-quiet is pretty good.

Any comparisons between cascade and b-quiet?

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2004 TB/W 6mt Coupe. Sunroof only.
Bel Vector 985 Hardwired.
Grounding Kit.
Splash Guards.
Custom Carputer.
Custom FG Sub Enclosure.

 

A 36 sq/ft pack of dynamat extreme weighs about 20 lbs. This will be enough to hit all of the trouble spots with some left over.

The front foot/wheel wells and over the rear wheel wells and over the rear seat will cut down on the road noise considerably. I can carry a conversation with the G/F without having to raise my voice at highway speeds. I did the driver's side door but didn't notice any improvement there.

 

No idea on the b-quiet, but I did see the name floating around chevytalk.com while I was looking for the name of Cascade.

Not sure how many of you have experience with older cars, but speaking from personal experience, the '55-'57 Chevys need insulation BADLY to reduce noise and heat. These are the guys that you can be certain have looked into all of the possible alternatives. Of course, it's not just the floors but the doors, firewall, roof, hood, trunk, etc. that need attention on these older cares. Lots of methods and products have been used over there. Glad I decided to get rid of the '55 before I got to the insulation issue. [img]/w3timages/icons/wink.gif[/img]

I used Dynamat Xtreme (before I went to chevytalk.com and learned of Cascade) and did complete coverage in the cargo area of my '97 Eclipse GSX (it had NO insulation back there from the factory) and added some under the rear seat. It worked great, and even cut down on the noise of that 3" turbo-back exhaust!... ...while the windows were up at least. lol

Even with as much of a weight savings program that I plan to put my G on, I'm still probably going to lay down a lot of this Xtreme-level insulation. This time, I'll save the money and not pay for the Dynamat logo.



'05 IP(or ?) 6MT... ...Never too soon to think about modifications!!

 

Check out my rather long post about my dynamat experience. http://forums.freshalloy.com/ubbthre...4&Forum=UBB25&

I did most of the problem areas with 1 box of the 36 sq feet of Dynamat Xtreme. Then i did 1 layer of "dynaliner" in the trunk. It has helped a great, great deal with road noise and quieting my exhaust. What I've noticed is that I now listen to the radio at a much lower level. I don't need to put it up so high to overcome the roadnoise.

There are in fact a few other products that are similar to dynamat, but when I was reading up about which one to buy, I still chose Dynamat extreme. Their product seems to do an excellent job of dampening, plus it is very easy to install. I've read on other forums that you need a heat gun to first heat up the material to make it so you can apply it. This was also the case with regular dynamat. But the "extreme" type doesn't need to be heated. Just peeled off the backing and put on. Very easy. Just very time consuming.

 

I think the best way to cut down on road noise is to get quieter non-performance tires. Dynamat is supposed to reduce vibrations and reflected sound rather than muffle sound coming from outside. There are different products for that. I had to remove the driver's seat to run wires from my AVIC-N1 to the secondary unit and going under the seat, I saw that there was lots of sound deadening under the car. Personally, I'm ok with it and on my drive to and from work, it mostly has to do with the road. The tires amplify the road noise. Some newer roads are pretty quiet, but bad roads are pretty loud.

 

See, I almost agree with what you are saying . . .but here is the problem. I had Z rated pilot sports in my CLK430, and the ride was not as loud. Although I agree that bad roads make it worse and tires contribute. Proper sound deadening would mask the noise.

Consider this, Lexus SC430 . . .does it not have high performance tires? What about the AMG models? None of them are as loud as the G35.

Here is another thing to consider . . .when you drive the G and pick up road pebbles and debris, it clangs so damn loud against the side of the car. Never was that loud with the CLK which confirms that the G simply doesn't have enough sound insulation.

The fact that it would only have cost Infiniti approximately $100 a car and 20lbs of weight to put in more sound insulation completely dumbfounds me.

If they wanted to differentiate the G from the Z, making this car quieter and more luxurious would have been the trick. But fortunately or unfortunately depending on your point of view, the G is simply a four-seat 350Z.

 

Great thread. I'm really into it. Problem is that I don't have the time (or know how) to do what you did, although I'm desperate to quiet this car down.

Does anyone know who in NJ could install Dynamat for a reasonable price?

 

Compare the curb weight of the CLK and G35C and you will find out how much high quality interior and sound deadening material cost. How much does the SC430 weight? Sound deadening is not as simple as slapping $100 worth of dynomat all over the car, afterall, it takes man hours to install these. Still.... I agree with others, road noise in the coupe over uneven surface is way too much.

 

I doubt that the all of the increased weight attributable to a CLK is due to sound deadening. I think there is a lot that goes into that car that makes it heavier. But to be honest, it was more a stable car on highspeed highways than the G is. The CLK was a dog in curves due to a soft suspension and a recirculating ball steering, but it was a MONSTER on the highway. The G is good on the highway, but feels too nervous and is just too loud. But on twisty roads, the car rocks!

That's why I'm making a big deal about the noise issue. If they would have made it quieter, the car would feel so much more composed. Trust me, the car would be even more popular than it already is. . . .

 

If someone decides to install sound deadening, it would be great if they could:

1. get a sound level meter and measure the interior road noise over a relatively rough road without other traffic around
2. get the car weighed at a weigh station

after adding the material, do the same tests.

 

I agree . . .

No matter, I think it is a safe bet that aftermarket sound deadening would improve the road noise situation no matter what . . .(as to what degree, only an exact measurement would tell). With respect to weight, I think if you weigh the material before installation, you'll get an idea of the added weight. I think up to 50lbs is acceptable.

Remember, for most of us . . we don't live on a race track so a little extra weight is not going to matter especially if the real world benefits of lesser noise is noticeable.

 

"2. get the car weighed at a weigh station"
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For those interested here is a comparison of products on b-quiet.
The comparison shows db info weight (you can calc w/o weighing car), prices etc.

<font color=blue>04 Silverstone G35, 5AT, Prem, Aero
ES100 225/45-18 front 245/40-18 rear
Borla TD, Z-tube, Eibach, 35%Tints</font color=blue>

 

How much square feet do you think is required to cover the floors, trunk, doors, and wheel wells?

 

Super old thread but has anyone else tried to Dynamat there car. I am really getting tired of the road noise.