My ideal perfect car is not only insanely fast but also quiet. (I want to imitate an M5...ok, I know an accord is far from that but..) anyway, I want to know if anyone has experience with dynamating a car. Dynamat has so many different ones I want to know what people used and what's their experience...it's gonna be pricey for sure.

 

oh, you said "racecar" i didn't know it was an accord.
you can go dynamat happy on that sucker, no big deal.

 

haha, ok, let me explain why I say that. I'm going to be pushing over 450+hp and most people who do that are all for 1/4 mile times and making the car as light as possible. That's not my goal with my car.

I wanted it to be insanely fast but I'm not willing to compromise comfort for that. I also want it to be quiet inside with a nice stereo. That's the whole reason I decided to put my h22 into a 4dr instead. Does that explain my situation a little better?

 

almost admirable.
is the car already too noisy?
you are running a full interior correct?
what size wheels and tires?

 

You are really trying to battle two types of noise here, and dynamat is only designed to take care of one of them.

The first is the noise created by vibrating panels. When something vibrates, it acts like an additional speaker in your system. That's bad. Dynamat (and other similar products) are called mass loading material. They have an adhesive side and are designed to add mass to the panels you apply it to. This lowers the resonant frequency out of the audible spectrum. This means that you won't hear it vibrating anymore.

The second kind of sound is your basic road noise. Dynamat will do nothing to help kill road noise. It's effectiveness as an insulator is minimal. For this function, you should find a barrier loading product. Cascade has been making these materials for a while, but they tend to be expensive. You can replicate the same material with some work by using some thin foam. Open celled foam for areas where no moisture is present, and closed cell foam is moisture is an issue. A barrier loader is designed to take the mecanical energy (sound waves) and convert it to heat, there by disappating the sound. Insulite foam (made by 3M) is a good material and is fairly cheap. Carpet padding (the foam used in your house) does wonders for your floor boards as well.

By combining mass loading and barrier loading products, you can get pretty quiet without adding too much weight to your car. To achieve the same level of sound deadening with just mass loading as you could with multiple materials, you are talking about about 5 times the amount of mass.

 

wow...great info. Thanks! Could you give me some links on this cascade stuff? Also how much carpet padding would you need for it to even make a difference? Seems like it's just a thin sponge to me.

 

you want your car to be two polar opposites; insanely fast and comfortable with a good stereo system. A stereo will decrease your Hp two ways, 1. your accesories now require more power to run them, susequently decreasing the hp reaching your wheels. and 2. just adding weight decreases hp reaching your wheels. it will be damn hard for u to get a h22 up to 400+hp when you are adding weight and accesories. I would choose one route and go with it.

 

1. Thats crap I'm afraid. Its only affecting the alternator, and the stereo doesn't affect the power outage of the alternator/motor, but the alternator can affect the output of the stereo.

2. Um, no. Adding weight does NOT change the hp getting to your wheels (unless your rotating mass is high, ie big heavy rims). With extra weight you are simply requiring MORE energy (power) to achieve the same performance. That's all. At 400 hp, its gonna be damn fast anyway (assuming it gets to 400 hp). An extra 100 lbs of dynamat aren't going to change things too much.

To the original poster, you could always try some of that closed cell foam....here's a thread https://honda-tech.com/zerothread?id=294835 ......not sure that the road race people appreciated what it can do for stereo/comfort/sound, etc.

HTH!

Steve

 

Yea, I agree...with you. and it IS possible to have both power and comfort. like I said, I'm not going for the fastest car. I WILL have insane power but yea, it won't be the fastest because of the stereo + sound deadening...etc. I don't care. That's what I want.

Thanks for that link. I've been searching for that for a while after seeing it used in Japan in their skylines. But I really wonder how much it actually quiets the car. I guess it's worth trying for such a cheap price. Just want to make sure there's not drawbacks to it.

 

Well, the only drawbacks I can see are -

1. It could be a waste of money.....dunno how good it really is, but that SCC article sure liked it....

2. You could burst open some seams if you're not careful.....again, I don't know how true/likely that may be.

If/when you do decide to do it, take pics and let us know how it works! I'm planning on sound deadening and/or foam on my del Sol, which will also be quick and have a comfy interior.

Steve

 

Yea, if I go that route I definately will.

Does anyone else have comments about what rcurley55 said? I was under the impression that dynamat was suppose to accomplish both helping your stereo but also keeping road noise out (if you apply the correct sheets that they sell to each respective purpose). Anyone dynamat their car and can say they noticed a quieter ride?

 

Just FYI......

http://www.b-quiet.com/index.html

I'm planning on brown bread and some foamy material maybe (they have some new Lcomp stuff that's interesting......)

Steve

 

brown bread ....i'll get my promised pics up soon

-Rage