 Backpad delete questions |
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| jmargush |
 Feb 19 2022, 02:12 PM
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Member  Group: Members Posts: 460 Joined: 8-June 04 From: Goshen, IN Member No.: 2,176  |
Does anyone know if there is a backpad delete process documented in a thread?
For those who have done it did you leave the rubber mat attached tot he inside of the firewall or remove it? What materials felt/carpet? have been used to cover the firewall? Sources? |
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| GregAmy |
Feb 20 2022, 12:49 PM
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Advanced Member Group: Members Posts: 2,311 Joined: 22-February 13 From: Middletown CT Member No.: 15,565 Region Association: North East States 
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I still have one of those eBay kits I never installed...
Instead of bumping that necro-thread...what's the noise difference with a noise mat behind Perlon? I don't really want to increase it much (if at all). And of course I'd have to dispense with a light. |
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| Superhawk996 |
Feb 20 2022, 12:55 PM
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#3
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914 Guru Group: Members Posts: 5,900 Joined: 25-August 18 From: Woods of N. Idaho Member No.: 22,428 Region Association: Galt's Gulch
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QUOTE(GregAmy @ Feb 20 2022, 01:49 PM)  I still have one of those eBay kits I never installed... ...what's the noise difference with a noise mat behind Perlon? I don't really want to increase it much (if at all). Be forewarned, NVH is going to get worse on it's own with just Perlon. The combination of the OEM asphalt mat (mass damper), the fiberboard backpad backers (noise barrier), the contour foam (noise absorber), and the vinyl (noise barrier) is a pretty effective noise treatment. I'd consider the addition of at least Dynamat (a highly effective, constrained layer + mass damping) behind the Perlon. Dynamat is going to be more effective than the original asphalt mass damping mat was. |
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| horizontally-opposed |
Feb 20 2022, 05:24 PM
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#4
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Advanced Member Group: Members Posts: 3,432 Joined: 12-May 04 From: San Francisco Member No.: 2,058 Region Association: None
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QUOTE(Superhawk996 @ Feb 20 2022, 11:55 AM) Be forewarned, NVH is going to get worse on it's own with just Perlon. The combination of the OEM asphalt mat (mass damper), the fiberboard backpad backers (noise barrier), the contour foam (noise absorber), and the vinyl (noise barrier) is a pretty effective noise treatment. I'd consider the addition of at least Dynamat (a highly effective, constrained layer + mass damping) behind the Perlon. Dynamat is going to be more effective than the original asphalt mass damping mat was. Was hot to move to a carpeted firewall a few years ago—they look great!—but never got around to it. Thanks for a reminder of why I shouldn't. (IMG:style_emoticons/default/beerchug.gif) I've actually been thinking about adding insulation under the engine lid and a dual-pane rear window. Even with a factory airbox, a 914-4 engine-side mat, the asphalt mat inside, and a full back pad, the Mezger six is a lot to listen to when the top is on. When the top is off, it's pure heaven—which has kept me from making any changes so far… |
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Posts in this topic
jmargush Backpad delete questions Feb 19 2022, 02:12 PM
Craigers17 Here's one discussion.
https://www.google.co... Feb 19 2022, 02:39 PM Geezer914 I covered mine with a piece of Perlon and installe... Feb 20 2022, 12:28 PM GregAmy Noted, thanks.
Given my backpad is still in excel... Feb 20 2022, 01:07 PM partwerks I put in a rear view mirror with map lights. Feb 20 2022, 05:27 PM
horizontally-opposed
I put in a rear view mirror with map lights.
^ ... Feb 20 2022, 05:41 PM
partwerks
I put in a rear view mirror with map lights.
^... Feb 20 2022, 05:49 PM Montreal914
I put in a rear view mirror with map lights.
... Feb 20 2022, 07:05 PM partwerks
[quote name='partwerks' post='2983130' date='Feb ... Feb 20 2022, 07:27 PM roblav1 I did this on my car. Very carefully cut Dynamat ... Feb 20 2022, 06:28 PM roblav1 Here... somehow, it went upside down! Hopefu... Feb 20 2022, 06:35 PM partwerks https://www.ebay.com/itm/233579578314?hash=...FQAA... Feb 20 2022, 07:38 PM bkrantz Check out my build thread. I put a layer of Dynam... Feb 20 2022, 08:08 PM |
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