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Thread: Tailgate sound insulation

  1. #1
    Join Date
    Oct 2009
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    Aus
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    540i + 528iT

    Tailgate sound insulation

    Hey guys,

    Does anyone have any experience with the tailgate sound insulation?

    I took the trim off to get to the lights and the sound insulation mat fell apart. I mean literally turned to dust.

    I'm talking this part:
    51488194675

    Now, I can find a replacement in Aus. I can either wait and try to ship over, but the cost will be excessive.

    Will standard butyl sheets do the job?

    While I'm at it...any tips for getting the trim back onto the tailgate without a helper?

    Mine keeps falling out before I can get the screws in.

  2. #2
    Join Date
    Oct 2016
    Location
    Atlanta
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    392
    My Cars
    2001 540iT
    Any sound deadening insulation will work. Dynamat? There's other brands just call a car audio shop or look online

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  3. #3
    Join Date
    Dec 2006
    Location
    West of Boston, MA
    Posts
    726
    My Cars
    2001 BMW 540iT/6
    Butyl is the sticky rubber goo used to hold the vapor barrier / insulation in. The barriers themselves are foam ? I think.

    You can try and find some thin foam sheet and cut to fit. Dynamat May work but it might also add weight to the hatch and make it tougher to stay open (particularly if you have worn struts)


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  4. #4
    Join Date
    Feb 2014
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    ‘01 540’00 528T’03 525T
    Snotty says PLUS 1 to Scotty. Dynamite is heavy, so if you feel you have to use the stuff, get the Dynamat Lite, about half the weight of the regular stuff.Really, you don’t need the stuff as the whole idea about Dynamat is to weigh down the huge panels of steel or aluminum, to keep it from reverberating, mainly for high end audio, although, it will muffle out road noise too. But the main concern is the weight. Perfectly fine when the tailgate struts are in good shape. All you need is a good dense foam cut to shape. I just replaced the old foam on my green wagon about a year ago. Really didn’t replace it, it was still good, so I doubled it up with the new one, stuffed dense rubber foam in the open nooks and crannies, here and there. It did help get rid of a lot of road noise, what really helped a lot was replacing the tailgate gasket with a new one.
    What I need to get are those corner rubber baskets that go on the bottom corners of the tailgates door well, kinda sit on the rear bumper. They’re only like $25 or so a piece.
    Set the controls for the heart of the sun

  5. #5
    Join Date
    Oct 2009
    Location
    Aus
    Posts
    153
    My Cars
    540i + 528iT
    Yeah, I didn't really think of the weight. The OEM stuff is very light.

    I was thinking of Butyl sheets like this:
    https://www.amazon.com.au/deadening-.../dp/B00URUIKAK

    But, yes, my tailgate struts aren't great, so I should keep weight to a minimum.

  6. #6
    Join Date
    Dec 2006
    Location
    West of Boston, MA
    Posts
    726
    My Cars
    2001 BMW 540iT/6

    Tailgate sound insulation

    Looks like butyl backed foil of some kind? Maybe worth a try... Cleanup might be a disaster if it doesn’t work as hoped though. That looks to be a comp to dynamat so could also weigh a lot.

    You could try and talk to some custom car audio shops to see if they have recommendations


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    Last edited by scottieducati; 08-26-2020 at 07:25 PM.

  7. #7
    Join Date
    Jun 2016
    Location
    North Carolina
    Posts
    1,249
    My Cars
    03 525it/5, 1967 GTO
    I used Fatmat under the rear deck of my sedan. Similar to Dynamat but less expensive and not as heavy

    https://www.amazon.com/dp/B003TU6066...ing=UTF8&psc=1

  8. #8
    Join Date
    Nov 2016
    Location
    NY
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    750IL/540iT/R53/E46Vert
    He’s in Australia - choices will be different.

  9. #9
    Join Date
    Jan 2005
    Location
    Baltimore
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    176
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    99 528iTA
    The later years seem to use a better material. My 1999 foam is dust in the wind but I got one out of a 2002 and it is in much better shape.

  10. #10
    Join Date
    Dec 2006
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    West of Boston, MA
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    Really depends on climate and such too. A car left out in the sun a lot is gonna have crappy foam and plastic.


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  11. #11
    Join Date
    Jan 2017
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    CT
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    My Cars
    2011 750Lix M sport
    I picked one up from FCP. Took a few weeks to get here but it was around $50. Still in the box haven’t installed yet.


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  12. #12
    Join Date
    Oct 2009
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    Aus
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    540i + 528iT
    Thanks guys,

    I'll look at picking up a similar type of foam mat somewhere and; if I can't find anything, I guess I will just have to fork out for the OEM mat from FCP or a similar supplier.

    Back to my second question. Does anyone have any advice on getting the trim back on? Mine is driving me crazy as it keeps falling out before I can get the screws in.

  13. #13
    Join Date
    Feb 2014
    Location
    Alexandria, VA
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    ‘01 540’00 528T’03 525T
    Just man up and have the screws ready on hand. I’ve done it many times without any help, you can do it. Hold the piece up on location, one hand, with the other hand, screwdriver holding the screw, screw it in on one corner, then the next. Once you get two or three in, you can relax your other arm. If thats too much for you, use a prop, like an adjustable rod to stand on the ground, or a small table, other end holds the piece for you, get creative, no? Sucker a friend over, make him, or her useful. By the way, the oem foam was only about 1/4” or 3/8” thick.
    Set the controls for the heart of the sun

  14. #14
    Join Date
    Jan 2017
    Location
    CT
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    My Cars
    2011 750Lix M sport
    Quote Originally Posted by bmchuckleyou View Post
    Thanks guys,

    I'll look at picking up a similar type of foam mat somewhere and; if I can't find anything, I guess I will just have to fork out for the OEM mat from FCP or a similar supplier.

    Back to my second question. Does anyone have any advice on getting the trim back on? Mine is driving me crazy as it keeps falling out before I can get the screws in.
    Are the plastic push pins in place which hold it in until you can get the screws in? Similar to the ones in the door panels? Also when I did mine I took the tool tray out thereby reducing the weight pretty simple process. Hope that helps…


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  15. #15
    Join Date
    Oct 2009
    Location
    Aus
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    540i + 528iT
    Quote Originally Posted by BimmrMeUpSnotty View Post
    Just man up...... Sucker a friend over, make him, or her useful.
    Best advice on Bimmerforums. Johnny Lawrence, is that you? Hahaha

    Thanks for the actual advice, btw.

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