Champagne

Hey all,

to those who soundproofed their doors with either Dynamat or B-quiet, how did you go about it. Did you apply the product to the door or the inside face of the door panel.
And if you applied it to the door, how did you guys deal with the access hole that is only covered by plastic originally.

Thanks in advance

Paul

Chris

I applied it to the door, cutting holes where appropriate for the door panel fixers, cable etc ... If you have to get in the door again it is easy enough to peel back.

Chris

Randy V

I hear ostrich feathers work excellent, Paul!

Kidding!

Perhaps Seth W will also respond - he soundproofed his GT.

Champagne

Ha hell!, and I have everything but the feathers

Hey Chris, so I assumed that you removed the original plastic and replaced it by the soundproofing sheet? Did you cover the middle access hole?

Hey Sterling, here lies the dilemma. Both installs have been discussed but I don't think there is a consensus as to what gives the best performance.

Paul

Chris

Hey Paul, yes my Plastic sheeting was shot so not much of a loss there. Yes I covered all the access holes.

Big improvement noise wise too.

Chris

Steve 88

I am going through the sound-proofing process right now. I couldn't quite figure out where best to put the B-quiet material on the doors. I ended up doing some very un-scientific testing. I rapped my knuckles on the outside of the door to simulate pothole/seam noise. Placing the B-quiet on the inside of the door (inside side of skin and opposite side) seemed to cut down on the resonance and make quite a difference in muffling the sounds. I couldn't easily test the B-quiet on the side facing the cabin (covered by the panel), although I did put some there. I think this blocks sound from entering the cabin as much as it reduces resonance. I did not cover the holes, but am having second thoughts after reading these posts. I had to remove some B-quiet from the area around the indentation for the speakers. Even though the stuff is pretty thin, I think this was causing me to have trouble getting the panel back on. Once removed, the panel fit better.

I have finished one door and will move on to the other tomorrow morning. I am not expecting that the door treatment (as I have done it) will reduce sound as much as the foam stuffing of the rear wheel wells I did last week.

Good luck.

urnotthesameina928

Just when you think your the only one taking off the door panels to fix some things and getting ready to sound proof them and out comes a post just in time.. I am probably going to order the B-quiet since it looks like it works the best. Just started reading up on the stuff yesterday.. from what I have read it may work better than dynamat. Let us know how it turns out. From what I have seen most of the soundproofing is done by covering up any holes when possible...an air tight seal would be ideal...I wonder if placing a second layer right on the backing of the door panel would work? I know there is only so much room and some of this stuff can be thick but it might be easier than laying it inside the door . If the material is too thick though the door panels may not clip back on so this will have to be looked at. Dave

bwebb77

I have finished one door and will move on to the other tomorrow morning. I am not expecting that the door treatment (as I have done it) will reduce sound as much as the foam stuffing of the rear wheel wells I did last week.

Good luck.[/QUOTE]

Hey Steve what kind of foam stuff did you use and did you "spray" it where the rear speakers are? That is, directly behind the driver and pass seat.

Champagne

Thank you all for your insights guys.

I have the B-quiet in hand and I don't think thickness will be an issue.
My gut feeling tells me that applying it to the door, in place of the plastic that is there right now would be the best. That material does work by absorbing vibration and I would suspect that the doors must act somewhat as speaker enclosers at times.

I think I'll give that a try and report back.

Paul

Alan

Paul,
Post your subjective results from this - I'm very interested in doing this too - my GTS (although supposedly already improved) could be a lot quieter.

Are you planning to do anything else for sound proofing - say the fronts of the rear wheel wells... I hear that's a major source too. Having seen your interior I'm sure the sound-proofing you do will be very well executed - like to see what you figure out - is the B Quiet a fully waterproof membrane? How thick is it and will that create any issues?

Alan

Omar_7375

Champagne,

Instead of adding B-Quite why did you not instead replace the rubber sealing of the door instead? I am actually thinking of doing that at my Porsche dealer. From what I can see with the cost B-Quite the price wouldn't be that different.

Champagne

Hey Omar, my door seals are in perfect shape and although they do an excellent job of keeping the rain and moisture out, I doubt they contribute much in soundproofing.

Hey Alan, I plan on doing the rear quarters next but this another area where more than one techniques exists. While some have filled the void with foam from the outside, others have concentrated their efforts on the area behind the leather quarter panels. I will need more information on that one.

The stuff I bought is the B-quiet Ultimate. It's about 1/16" thick and being butyl backed by an aluminum sheet, it should easily double as a moisture barrier.
I'm trying to figure a way of covering the entire door while still having easy access to the door's innards.

In any event, I'll take some pictures.

Paul

Alan

Omar,
I replaced my door seals recently (old ones were a bit torn). It did reduce at speed wind noise but thats about all - there is still some resonance noise... Its not cheap on the GTS - seals changed at some point (S4?)

Alan

Omar_7375

Thanks Paul & Alan. It looks I might be saving money by spending money and still not being satisfied.

I will wait to see your pics Paul so as to see what the car doors will look after- i am assuming you will not be able to tell with the car doors shut?

Chris

Rear quarter sound proofing: I removed the thin foam that is on the backs of the quarter panels that covers the front of the rear wheels, I placed the sound proof material there. I sprayed foam into the rear speaker cavity also and placed more sound proofing material on the inside of the speaker enclosure. Works pretty good.

Material: I bought more Dynamat Extreme than I could use on Ebay, a box for $99.

Door seals: when I had some body work done I had to remove the door seals and drive the car, I was amazed at the road noise ..... I ordered a new drivers door seal from Pelican and it was reasonably priced and came with the GTS lip (nice surprise). While my old seal didn't look to bad its obvious the new one sealed better, you can tell as the door shuts with a nice 'thunk' now.

After all of this I can now tell there is a small gap where the inner seal (one the glass runs in) has between the glass and the outside world. I could not hear this before over all the road noise .....

I wouldn't expect a huge improvement by doing just the doors, its more subtle and any improvement will only highlight the next area to work on !. One thing that motivated me was how quiet my 91 was compared to my 87.

Chris