Sound Deadening Project

[johnloov]

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[Monkey_Luck]

I have started installing everything and this takes a lot more time than I thought it would. So far i have installed NVX CLD. Closed cell foam and 1" double scrimmed thinsulate in the entire hatch area. I am currently working on the rear doors have installed NVX CLD and 1" megazorbe pro in both rear doors. The rear door panels i have applied CLD and lots of thinsulate. I am still working on the inner door skins and will be making block off plates out of 1/32 lead sheets wrapped in CCW.

 

[johnloov]

I have started installing everything and this takes a lot more time than I thought it would. So far i have installed NVX CLD. Closed cell foam and 1" double scrimmed thinsulate in the entire hatch area. I am currently working on the rear doors have installed NVX CLD and 1" megazorbe pro in both rear doors. The rear door panels i have applied CLD and lots of thinsulate. I am still working on the inner door skins and will be making block off plates out of 1/32 lead sheets wrapped in CCW.

Make sure you use one large piece in doors or pieces are connecting. Sound likes to go around.

 

[Han_Solo]

This is a great video, especially explaining the concept of resonance using a cymbal as the major source.

Now I'm wondering where to get better door seals and acoustic glazing for the windows.

 

[johnloov]

Another big upgrade I did recently is I’m racing in 275/35/19 on stock rims Pirelli pzero corsa’s and the ride and noise is much better. I did get a bit of wheel rub on one side because my front fender liner was sagging because I sound proofed the wheel arches then used some glue to hold it close. Zero metal contact and now zero rub on fender since I glued it closer to metal. It was simply sagging due to the weight of the foam I installed on wheel liner. I’m now able to go to the track and home in super comfort, and even less noise than before. The only downside is gearing is slight increases so it’s off by 2-3 mph and I can feel it on long straight aways at Cota, but then again I have zero wheel hop anymore flooring it first and second, and actually compared to the stock cup 2 and stock 4s lap times I am 2-3 seconds faster at Cota. The best I could do at COTA on oem dt1 4s was ~2.42 cup 2 2.41 and oversized 275/35 stock rims Pirelli pzero corsa streetable track tire was 2.39

 

[Han_Solo]

Another big upgrade I did recently is I’m racing in 275/35/19 on stock rims Pirelli pzero corsa’s and the ride and noise is much better. I did get a bit of wheel rub on one side because my front fender liner was sagging because I sound proofed the wheel arches then used some glue to hold it close. Zero metal contact and now zero rub on fender since I glued it closer to metal. It was simply sagging due to the weight of the foam I installed on wheel liner. I’m now able to go to the track and home in super comfort, and even less noise than before. The only downside is gearing is slight increases so it’s off by 2-3 mph and I can feel it on long straight aways at Cota, but then again I have zero wheel hop anymore flooring it first and second, and actually compared to the stock cup 2 and stock 4s lap times I am 2-3 seconds faster at Cota. The best I could do at COTA on oem dt1 4s was ~2.42 cup 2 2.41 and oversized 275/35 stock rims Pirelli pzero corsa streetable track tire was 2.39

Are you running the standard damper module or the ITS module?

I have the same tyre setup and it made a huge difference in terms of ride comfort and NVH. I will look into sound proofing the wheel-wells in future and then stick the plastic tighter to the body. Thanks for the tip.

 

[johnloov]

Just running standard, in comfort setting, and type R on track - rides smooth, the extra sound dampening weight in trunk helped and tires.

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