Sound deadening/ride quality |
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Sound deadening/ride quality |
jmargush |
Sep 26 2022, 05:24 AM
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#1
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Member Group: Members Posts: 463 Joined: 8-June 04 From: Goshen, IN Member No.: 2,176 |
I built my car as an autoxer years ago and never installed carpet or sound deadener after the restoration.
Now as I age and have an opportunity to take a longer trip in the car I am looking for a little more "comfort" in the car. Question is how much will carpet and/or sound deadening improve the road noise? The back pad has been removed and there is sound deadener and felt covering the firewall currently. Curious as to what you all might have experienced or recommend. I am also thinking about dialing back the suspension setup for the long trip. |
Cairo94507 |
Sep 26 2022, 07:10 AM
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#2
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Michael Group: Members Posts: 10,057 Joined: 1-November 08 From: Auburn, CA Member No.: 9,712 Region Association: Northern California |
I believe the sound deadener makes a dramatic difference in our cars. My floor, firewall and doors are all done. Anything you can do to keep heat and sound out is a good thing. (IMG:style_emoticons/default/beerchug.gif)
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Superhawk996 |
Sep 26 2022, 07:38 AM
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#3
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914 Guru Group: Members Posts: 6,502 Joined: 25-August 18 From: Woods of N. Idaho Member No.: 22,428 Region Association: Galt's Gulch |
Duplicate
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Superhawk996 |
Sep 26 2022, 07:46 AM
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#4
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914 Guru Group: Members Posts: 6,502 Joined: 25-August 18 From: Woods of N. Idaho Member No.: 22,428 Region Association: Galt's Gulch |
I have been involved in data analysis and modeling to correlate ride quality with 3rd party quality metrics like Consumer Reports, JD Power, OEM customer satisfaction surveys.
Sound is a highly correlated variable even though it has no direct effect on ride quality. That is to say that most people if they perceive that bumps are “loud” they are also perceive the bump to be more severe than it really is as measured by seat track accelerometers. So - a quieter car is perceived to ride better than an equivalent car that is noisy. Addition of constrained layer damping like Dynamat will get you a huge improvement over what you have (nothing). This treatment will reduce the structurally transmitted noise low frequency noise <100 Hz. Addition of carpet and a back pad over Dynamat will reduce the higher frequency airborne noise above 100 Hz. You really want both types of noise reduction treatments since they each affect different noise frequency ranges. Don’t forget the felt liner on the targa top - that big fiberglass panel is a noise reflector. Dialing back your suspension from an AX setup would also be a significant improvement for long trips. |
mlindner |
Sep 26 2022, 08:29 AM
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#5
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Senior Member Group: Members Posts: 1,568 Joined: 11-November 11 From: Merrimac, WI Member No.: 13,770 Region Association: Upper MidWest |
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emerygt350 |
Sep 26 2022, 08:43 AM
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#6
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Advanced Member Group: Members Posts: 2,473 Joined: 20-July 21 From: Upstate, NY Member No.: 25,740 Region Association: North East States |
What do you suggest for the roof? Mine has nothing at the moment, didn't really consider the added sound deadening it would provide. Mine is pretty quiet but I could always use more..
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Superhawk996 |
Sep 26 2022, 09:22 AM
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#7
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914 Guru Group: Members Posts: 6,502 Joined: 25-August 18 From: Woods of N. Idaho Member No.: 22,428 Region Association: Galt's Gulch |
What do you suggest for the roof? Mine has nothing at the moment, didn't really consider the added sound deadening it would provide. Mine is pretty quiet but I could always use more.. Something like this. I don’t recall my OE headliner having edge binding but this should be close. On my 2nd car it is missing and yet to be replaced but I’ll use this or just cut some Perlon. https://www.pelicanparts.com/More_Info/APBZ...eBoCu4MQAvD_BwE |
jmargush |
Sep 26 2022, 09:32 AM
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#8
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Member Group: Members Posts: 463 Joined: 8-June 04 From: Goshen, IN Member No.: 2,176 |
Thanks guys great info!
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Retroracer |
Sep 26 2022, 01:08 PM
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#9
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Senior Member Group: Members Posts: 620 Joined: 7-July 13 From: Bend OR Member No.: 16,100 Region Association: Pacific Northwest |
What do you suggest for the roof? Mine has nothing at the moment, didn't really consider the added sound deadening it would provide. Mine is pretty quiet but I could always use more.. My car (faux GT) has almost zero sound insulation, but I did rework my roof panel a while back to try and reduce heat transfer inside. I used a product called Dynaliner: https://www.dynamat.com/products/dynaliner/ on the bare fiberglass, then purchased a precut headliner piece from 914Rubber: https://914rubber.com/oem914563321113-1-700-charcoal-1-2975 to finish it out. Can't really comment on whether the heat insulation reduced the sound as the rest of the car is so loud at speed anyway; but the thermal reduction worked a treat ;-) - Tony |
jmargush |
Sep 26 2022, 04:42 PM
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#10
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Member Group: Members Posts: 463 Joined: 8-June 04 From: Goshen, IN Member No.: 2,176 |
Another question is there an opinion on whether loop carpet is more effective than perlon at reducing sound?
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mlindner |
Sep 27 2022, 04:19 AM
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#11
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Senior Member Group: Members Posts: 1,568 Joined: 11-November 11 From: Merrimac, WI Member No.: 13,770 Region Association: Upper MidWest |
Loop all the way. Perlon is very thin and light.
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emerygt350 |
Sep 27 2022, 06:49 AM
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#12
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Advanced Member Group: Members Posts: 2,473 Joined: 20-July 21 From: Upstate, NY Member No.: 25,740 Region Association: North East States |
Any opinion on just applying a sound deadening mat to the targa without carpet? Was thinking maybe a sheet of this stuff and calling it a day.
https://www.amazon.com/Siless-Sound-Deadeni.../dp/B07CG2YPRJ/ but that price I could just get carpet (if it were in stock). |
Superhawk996 |
Sep 27 2022, 08:24 AM
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#13
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914 Guru Group: Members Posts: 6,502 Joined: 25-August 18 From: Woods of N. Idaho Member No.: 22,428 Region Association: Galt's Gulch |
@emerygt350
I guess I’m wrong - looked again and it says it does have the aluminum constraint layer like Dynamat. |
bbrock |
Sep 27 2022, 08:52 AM
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#14
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914 Guru Group: Members Posts: 5,269 Joined: 17-February 17 From: Montana Member No.: 20,845 Region Association: Rocky Mountains |
I'd do a search on other recent threads on sound deadening. As @Superhawk996 said earlier, different materials reduce different frequencies of sound. The firewall also has the engine noise to contend with which is why sound deadening in that area was designed as a sandwich of different materials to reduce sound levels.
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rfinegan |
Sep 27 2022, 09:41 AM
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#15
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Senior Member Group: Members Posts: 1,021 Joined: 8-February 13 From: NC Member No.: 15,499 Region Association: MidAtlantic Region |
Coming back from Octeeener fest, MY 75 914 did not have the fire wall blanket, on on return I purchased and installed a Synthetic blanket from Rix914 at the show..EZ install and made a noticeable difference in the reduction of engine noise in the cabin. Wish I had done this upgrade earlier . Rick is a great guy to work with too
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jim_hoyland |
Sep 28 2022, 07:10 AM
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#16
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Get that VIN ? Group: Members Posts: 9,466 Joined: 1-May 03 From: Sunset Beach, CA Member No.: 643 Region Association: Southern California |
Coming back from Octeeener fest, MY 75 914 did not have the fire wall blanket, on on return I purchased and installed a Synthetic blanket from Rix914 at the show..EZ install and made a noticeable difference in the reduction of engine noise in the cabin. Wish I had done this upgrade earlier . Rick is a great guy to work with too Does that mount inside the cabin ? Are they available on-line ? @rfinegan |
bbrock |
Sep 28 2022, 08:13 AM
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#17
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914 Guru Group: Members Posts: 5,269 Joined: 17-February 17 From: Montana Member No.: 20,845 Region Association: Rocky Mountains |
Coming back from Octeeener fest, MY 75 914 did not have the fire wall blanket, on on return I purchased and installed a Synthetic blanket from Rix914 at the show..EZ install and made a noticeable difference in the reduction of engine noise in the cabin. Wish I had done this upgrade earlier . Rick is a great guy to work with too Does that mount inside the cabin ? Are they available on-line ? @rfinegan It replaces the heavy tar/fiber mat inside the engine bay and is available online. It's the same mat I went with and I really like it. I measured 1 dB sound reduction inside the cab compared with a less expensive sound/heat reduction mat. Unfortunately, I got too excited about installing the new mat and forgot to measure sound with no mat at all. It is significant though. |
rfinegan |
Sep 28 2022, 02:00 PM
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#18
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Senior Member Group: Members Posts: 1,021 Joined: 8-February 13 From: NC Member No.: 15,499 Region Association: MidAtlantic Region |
https://www.rix914parts.com/store/p29/914_F...uction_Mat.html
attaches with factor metal tabs and 3/ 4 push in fasteners from the engine compartment |
FL000 |
Sep 28 2022, 08:23 PM
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#19
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Member Group: Members Posts: 424 Joined: 31-January 12 From: Lancaster, CA Member No.: 14,076 Region Association: Southern California |
Food for thought but don’t forget to focus on any window gaps as they contribute significantly to road noise and overall comfort.
Case in point I spent some time recently readjusting my door windows and seals. Couldn’t believe how much more relaxed I was driving the 1500 odd miles to Utah and back. My car is loud as hell so not implying it is quiet by todays standards, but my wife and I were never so relaxed after 5 hours in the car. |
Van914 |
Sep 29 2022, 04:40 AM
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#20
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Van914 Group: Members Posts: 702 Joined: 5-January 03 From: Cincinnati, Ohio Member No.: 90 Region Association: Upper MidWest |
Years ago Stoodards used padding on the top above the roll bar to reduce sound.
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