Shadymindz0516

cosmomiller

Car Analogy

If you use any sort of dynomat, be sure to just put a little piece in the middle of each flat section, like 25% coverage. Don't try and cover every millimeter like you see on TV project cars. Way too heavy and too costly.

Full coverage is only worthwhile on professional level high watt audio competition automotive projects.

Tape the edges with metal foil tape from home depot. Used for sealing duct joints.

That thinsulate insulation is awesome, and awesomely expensive. For cars such as ours that you probably don't want to shut out all noise, something like the bubble wrap style foil backed insulation might be a good choice. Light. Cheap. Cuts down heat and some noise, but not too much noise.

Dynomat type damper, applied with 25% coverage, taped edges, foil backed bubblewrap.

tsukasa36

The nasty grey stuff is called jute padding or shoddy pads. While thinsulate does a good job of blocking out noise, the frequency it filters out does not match what shoddy pads filter out. I did a quick co-op at toyota in NVH team and the reason why some areas of the cars have certain type of NVH material is due to the frequency that area generates or permeates. While thinsulates are very good NVH material, replacing a shoddy pad with thinsulate may not give the same NVH performance. My 2 cents would be that you should add dynomat to metal and replace the old shoddy pad with newer ones for floor carpets. There is a reason why automakers use shoddy pad for floor lining (other than the fact that it's cheaper). on the other hand, thinsulates are almost always used in upper body NVH such as doors or behind plastic trim. Don't quote me on this but from what I remember, shoddy pads are better for lower frequency such as road noise/engine noise while thinsulate is excellent for higher frequency like wind noise. again no NVH expert here but one of the things I learned as a co-op a while back.

cosmomiller