Sound Deadening Project

[eldahank]

Wrapped up my initial sound deadening plan on the FL5 this weekend. Killmat in the trunk, door cards, and door skins, 4mm aggsound acoustic foam covering the door cards, 3M SM200L Thinsulate lining the trunk, rear wheel wells, and under the rear seats. Road noise is significantly reduced on the highway, the speakers sound much clearer with tighter bass, and the doors sound much more solid when closed. I was surprised how much easier it is to have a conversation on the highway. Next up, some goodies from CDT Audio!

Did you have any issues getting the door panels back on with the added material thickness?

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[johnloov]

Did you have any issues getting the door panels back on with the added material thickness?

I had no problems on the doors, some trial and error.

 

[track.n.trail]

Did you have any issues getting the door panels back on with the added material thickness?

Nope, zero issues with reassembly. I’ve had them off and on a few times since then swapping speakers as well.

 

[johnloov]

Quick update, drove from Dallas to Austin maybe longest road trip I’ve ever had, on cup 2s and zero tinnitus. The roads are much rougher here and I thought for sure it was gonna be too too much but actually the sound insulation worked really well.

another massive bonus was that the car seems to stay cooler in the hot sun because the doors are so insulated.

Also, I’m not really seeing any weight penalty. The only production cars that did a lot better at COTA circuit of the America, were the GT3 RS and GT4 RS. Type R did insanely well.



I thought these camber plates - ball joints to help camber would increase road noise, but luckily they did not.

enjoy your sound
insulation deadening without any regret of weight penalty.

 

[johnloov]

Here is the Zygrene Video review of the car: Enjoy

 

[johnloov]

Not sure if I shared this, but you may find it helpful, I deployed similar strategies. The civic also has a flap to allow air pressure to equalize.


I put open cell foam around that flap

 

[TomFrog]

I used products from resonixsoundsolutions.com for my hatch area and rear doors, and it made a noticeable difference. The midbass tightened up, and road noise dropped quite a bit, especially on rough pavement. It’s not crazy expensive if you focus on key spots like wheel wells and trunk. Their site has a bunch of info if you’re unsure where to start or how much material you’ll need.

 

[johnloov]

I noticed a big difference after doing the rear doors and trunk area....road noise dropped a lot on the highway. Took a full weekend but it was totally worth the time.

yes the rear wheel arches are the only wheel arches in the cabin. Be sure to really blanket all the way around the rear wheel wheels inside all the way up and around the rear passenger airbags. Doing a proper complete job, it’s important. You don’t want to waste your time like I did going back and realizing you should have done it right . Sound escapes easily

 

[jtlctr]

I noticed a big difference after doing the rear doors and trunk area....road noise dropped a lot on the highway. Took a full weekend but it was totally worth the time.

What materials did you use?

 

[johnloov]

In thread somewhere ) lots of info

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