Has anyone insulated the trunk-to-back-seat area for sound? I think I'm getting a lot of noise transmitted from the trunk area into the cabin. There's foil faced 1/4" rubber stuck on a Masonite divider I made for behind the back seat and also on the inside of the quarter panels beside the rear seat. But, nothing to block noise transmitted from the trunk over the wheel wells up to the interior quarter panels. Also didn't insulate under the rear shelf but I can stick more foil-faced rubber there. Thinking I should put more insulation of some kind on the front area of the trunk and extend it to the quarter panels. Haven't decided on what insulating material to use. Probably should be rigid. One thing I've thought of is some 1/2" thick soft fiber board. Second possibility would be some fiberglass insulation on Masonite. Don't know which would be better sound insulation. Has anyone done something like that? If yes, what material did you use?
Our new cars and vans have plastic bags full of insulation. Looks like ground up carpet insulation they had left over. They just shove the bags into areas like your quarter panels. Just an idea.
Good idea. Could stuff the area behind the interior panels. I want to avoid anything that will hold water but putting the insulation in plastic bags should prevent that. Thanks.
I had some 1.5" foam rubber from a previous project. Cut pieces to fit behind the interior rear panels, doubled them up, and put them in plastic garbage bags. Stuffed the area over the wheel well full to close off that path for sound. Put pieces of foam in baggies and stuffed them up in the cavities in the top of the trunk behind the rear package shelf. It helped some with the noise level inside the car. Definitely worth doing.
Insulation Did u take any pix of this upgrade? Im kind of confused abt all the garbage bags and baggies.
No pictures. Foam rubber was cut to fit 3 areas and placed in plastic bags to prevent them from getting wet. 1. Behind both interior rear 1/4 panels. Filled the areas from the door jam to the top of the wheel well. Used large trash bags here with the opening at the bottom to avoid collecting water.. 2. If you look in your trunk at the top you'll see a panel with cut outs that forms a chamber with the slopey part of the rear package shelf. I cut pieces that would fit thru the cut outs, put them in zip-lock baggies, and stuffed that chamber full. I may also add foil-faced, sticky-backed rubber insulation to the under side of the rear shelf. I'm still getting more noise than I like in the cabin.
do you think a trash bag and spray foam may work. Seams like it may be light weight and fill the hole a little batter.
I used jute for a bunch of it, and a bubble-wrap with aluminum foil on the floors. The jute I used in the quarter panels, on floor of trunk, under back seat, pretty much anywhere I could put it. Not just for sound, but also for keeping the interior cool in our 95 degree summer day heat.
The car is noisy in all those ways but this effort was directed mostly at exhaust noise. Already changed mufflers to reduce drone. Its tolerable now.
Yes, everything. Kit from AK and good used 1/4 window weatherstripping. Still have a few things to do though. Haven't reinstalled the plastic splash guards in the front fenders or two 1" plugs in the firewall. Most of the wind noise is from the windows that don't roll up all the way into the channel felts. Guess I shouldn't complain about wind noise till I've fixed that. Just some details I haven't gotten to yet but they're not going to have much effect on the exhaust noise that I'm working on now.
