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Thread: Sound deadening 1973

  1. #1
    Senior Member NorthernThrux's Avatar
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    Sound deadening 1973

    What's the current thinking of sound deadening for the floor pans for 72-73? I have the original insulation in the rear tub/parcel shelf etc. and no rust under it whatsoever. SO that's all good. On the floors I also have no rust but we chipped away some of the tar stuff with the hexagonal imprint at places where it had cracked to check for rust. All looked good, but now I have a few sections of bare metal where we did scraping (including almost all of the driver's side pan) and the remainder with the original black material. I've used POR15 over the bare metal but am wondering what I should do on top of that? Just leave it? Use rubberized coatings like Wurth etc? Or use some kind of modern audio or vibration damping material? What to people think?

    Ravi
    Early 911S Registry # 2395
    1973 Porsche 911S in ivory white 5sp MT
    2015 Porsche Macan S in agate grey 7sp PDK

  2. #2
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    These seem to be popular with full resto crowd. Was the way we are leaning with our 69 resto.

    http://www.repaintsupply.com/3m-0884...ads-p6102.html

    3M 08840

    Scott
    69 911S #1379
    65 356 SC #130757

  3. #3
    Senior Member csbush's Avatar
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    That 3M pad is what I am using in my 73 restoration. I think it is important to help absorb road noise. It does lay down nicely, and fits the contours of the floor pan. It looks about as original as I have seen- unlike dynamat and other sound deadening. They also look very similar to the replacement pads from Porsche I was able to buy in the mid 80’s when I replaced the sound deadening on my 70 911.
    Chuck

    Early 911S registry #380
    '70S
    '75S
    '96 C4S
    '65 R69S

  4. #4
    Senior Member NorthernThrux's Avatar
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    Thank you both. I hadn’t seen that product, but it turns out it is made in the 3M factory right here in town, so I can support a “local” business.

    Ravi

    EDIT: For future reference, NAPA carries this in the US and Canada.
    Last edited by NorthernThrux; 08-15-2019 at 07:17 PM.
    Early 911S Registry # 2395
    1973 Porsche 911S in ivory white 5sp MT
    2015 Porsche Macan S in agate grey 7sp PDK

  5. #5
    Senior Member NorthernThrux's Avatar
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    For reference.
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    Early 911S Registry # 2395
    1973 Porsche 911S in ivory white 5sp MT
    2015 Porsche Macan S in agate grey 7sp PDK

  6. #6
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    Like this.
    P1050290.jpgP1050291.jpg

    Thanks Scott72 for the tip.
    J P
    69 911T 2.4L w' 2.2S/E cams/Webers

  7. #7
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    Wurth also makes the similar adhesive backed materiel. I just wish they didn't put the diamond stamped texture on the top.
    72S, 72T now ST

  8. #8
    Senior Member csbush's Avatar
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    The other part of the sound proofing is the sound deadening pad that goes between the tar stuff on the floor and the carpets/floor mats. I know this was on my 73 T because I have pieces that were glued to the floor. Here is a picture of one from the back seat area:

    BC3A1EF3-4A8F-4934-A145-0BB70266966F.jpg

    I went to an upholstey supply store and got a roll of this carpet padding. Cut to shape and glued to the floor it looks like this:

    EB0D7E19-3563-44FB-A6A8-6AD061FEF9A1.jpg

    Not sure if this is exactly correct, but I matched the original best I could. It will help cut down noise and make the floor carpeting more comfortable on my feet.
    Chuck

    Early 911S registry #380
    '70S
    '75S
    '96 C4S
    '65 R69S

  9. #9
    I went large and the difference is DRAMATIC.
    Don't care about the weight, not that much. I can now have a conversation with my passenger, listen to bluetooth and not have ears ringing after hours of driving.
    With new carpet padding and carpet, you'll notice the difference in comfort. Doubt you'll notice the performance "loss due to the weight gain"
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    Ray Crawford
    Early S Registry #271
    R Gruppe #255
    '70 911 S Coupe 2.9 w/MFI Twin Plug "Flairs n Chairs"
    '72 911 S Targa 2.4 w/MFI

  10. #10
    Senior Member H-viken's Avatar
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    Quote Originally Posted by RC70SCoupe View Post
    I went large and the difference is DRAMATIC.
    Don't care about the weight, not that much. I can now have a conversation with my passenger, listen to bluetooth and not have ears ringing after hours of driving.
    With new carpet padding and carpet, you'll notice the difference in comfort. Doubt you'll notice the performance "loss due to the weight gain"

    Out of curiosity, what was the weight gain?
    SEARCHING FOR ENGINE 6208326 (last seen in car with VIN 9111101452)

    -70 911E
    -84 3,2 Sold

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