Maxie2U

I added soundproofing material behind the seats and placed the pre-cut BLOCKIT sound deadening mat right over the existing carpet in the hatch area. I now want to soundproof the rear wheel wells since this area transmits a lot of noise into the cabin but I do not want to remove the rear interior trim in order to sound proof the wells.

Has anyone soundproof the wheel wells from the underside by removing the rear wheelhouse liner?

Rooster OG

I’ve seen it done on here. I don’t remember seeing any feedback as to whether it was worth it or not. I think removing the rear interior would be a lot easier than removing the rear wheels and liners though. The rear interior is just those two plastic pieces on the sides and the carpet. It’s really not very tricky.

Maxie2U

I think removing the wheelhouse liner is easier and safer than removing the plastic side panels in the hatch area. I also believe in order to remove the side panels the rear panel also has to be removed.

What I don’t know is if the underside of the wheel wells are fully accessible with the wheelhouse liner removed.

etaylor14

Yes I have done three c7s I used peel and seal tape from Lowes I also did the cargo areas. It is a huge improvement.

Avanti

Before going to all that trouble... either way, I'd temporarily cover the wheel-wells on the inside and see how it actually sounds. Of course, this would hardly be exact since you probably would be using what we'd hope was less efficient make-do material.

red62vette

From the inside or outside?

Maxie2U

Please clarify, did you apply it from the underside of the wheel well by removing the wheelhouse liner or did you apply it on the top side of the wheel well by removing the interior trim/panels?

Hart1499

I recently did both. Doing under the fender wells is whole lot easier as the inside cargo space is quite small when you climb in there and try to move around. I put DynaMat with 3/8" mat inside and just DynaMat on the underside. Have not had a chance to go for a run and the weather here in Oregon is a little cool and snowy.

Maxie2U

Thank for the replies and assistance.

yeller z06

I recently put in sound insulation in the rear under the carpet and all of the plastic trim. There appears to be a fair amount of space under that trim over the wheel wells, but there are also a lot of wires that get in the way, so I didn't do much there. I like the idea of putting it under the external fender well liner, and I may try that this weekend with my leftover material.

Maxie2U

I plan on soundproofing the underside of the wheel wells in late January after I receive my Jackpoint Jack Stands. So if you do yours please share your learnings.

Here are a few pics of the underside of the wheel well without the wheel house liner. These pics show why I think it’s better to soundproof the underside.

bankers1

I have a lot of noise from the passenger side only from the seat back to the wheel, right from the dealer. Drivers side nice and quiet. Suggestions?

LT4CMG

When you say noise, do you mean road noise or squeaks? If road noise, very odd that you only get it in that specific area and completely fine on driver's side

Avanti

Right ear better than the left, perhaps?

HAD2HAV2

Max, did you use a product like Lizard Skin?

Maxie2U

Have not soundproof the wheel wells yet. I did add soundproofing material behind the seats using BLOCKIT.

I’m not familiar with “Lizard Skin”.

HAD2HAV2

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I’m not familiar with “Lizard Skin”.

Lizard Skin is a spray-on sound deadener.

oldC5

https://www.google.com/url?sa=t&rct=...WtmV7jkIE73rMd

Gonzo

I was wondering about spraying the wheel wells did not know there was a product!!

yeller z06

I finally did it this weekend, it got nice and warm (60s) and enough snow had melted that I could take the car out.

Removing the liner isn't very difficult. Natch once you add material where none was designed to be, it makes replacing the liner a bit more of a challenge. I only put material in the top curved section (see pics above in post 11) and the vertical section directly under it.

Because it would make too much sense and prove anything that I'd want to otherwise assume, I did not make before and after sound measurements. So by the seat of my ears guess, on my noisy cement highway I would suggest that road noise is slightly diminished by the addition of sound absorbing material.

I've also done the hatch floor, most of the tops of the wheel wells and the rear most bulkhead, as well as the bulkhead behind the seats. The material I used is a 3/8" composite of mass loaded vinyl and closed cell foam.

The road noise in my coupe is now tolerable, whereas before it was annoying. It is by no means quiet, but hey, it's a sports car.