Best "rubber" strut mounts? - Pontiac G8 Forum: G8 Forums - G8Board.com
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post #1 of 39 (permalink) Old 02-22-2017, 09:54 PM Thread Starter
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Best "rubber" strut mounts?

I currently have poly strut mounts and am not thrilled with the extra nvh it adds. It's not a huge amount, but noticeable. My question is, are there any rubber mounts that come close to poly for longevity?

2009 Pontiac G8 GT - Pacific Slate Metallic

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-1997 Camaro Z28
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post #2 of 39 (permalink) Old 02-23-2017, 08:10 AM
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Originally Posted by eagleknight97 View Post
I currently have poly strut mounts and am not thrilled with the extra nvh it adds. It's not a huge amount, but noticeable. My question is, are there any rubber mounts that come close to poly for longevity?
Apparently, the Pedders heavy duty rubber strut mounts (5851) are better than the other rubber strut mounts out there. I purchased some back in December along with their bearings (5030). I currently have the Whiteline strut mounts installed and I agree with your assessment as it relates to NVH.

I'll be installing the Pedders strut mounts this weekend along with Koni strut inserts and shocks, among other things.

From Pedders as it relates their redesigned heavy duty rubber strut mounts (5851) and bearings (5030): http://d22enj1fxubdc2.cloudfront.net...1295493082.pdf

I bought mine at GTOG8TA.com as they agreed to price match ultrarev.com's shipped price.

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#22 of 37: Summer-only Potenza tires

Last edited by GXP25; 02-23-2017 at 05:20 PM. Reason: More information.
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post #3 of 39 (permalink) Old 02-23-2017, 09:10 AM
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I'm curious what other suspension mods you have done, I'm running stock other then the Whiteline Poly strut mounts and the difference in NVH is non noticeable to me. I'm wondering if it's worse if you add other stiffer suspension components with them.

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post #4 of 39 (permalink) Old 02-23-2017, 09:12 AM
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SuperPro (I think) has two mounts - one that is like ever other mount and one that is sort of a "lite" poly mount. It's construction more closely follows the original design and it is supposed to add very little NVH. Part number should be SPF1590AK.
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post #5 of 39 (permalink) Old 02-23-2017, 09:24 AM
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Originally Posted by mjones73 View Post
I'm curious what other suspension mods you have done, I'm running stock other then the Whiteline Poly strut mounts and the difference in NVH is non noticeable to me. I'm wondering if it's worse if you add other stiffer suspension components with them.
Stock FE3 suspension. When I replaced the collapsing OEM mounts, my struts were still in pretty good shape.

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Originally Posted by FastKat View Post
SuperPro (I think) has two mounts - one that is like ever other mount and one that is sort of a "lite" poly mount. It's construction more closely follows the original design and it is supposed to add very little NVH. Part number should be SPF1590AK.
Good information and definitely something I'll look into if the Pedders HD rubber strut mounts fail earlier than expected.

That material reminds me of a similar light blue material that Moog uses in some of their bushings for other vehicles that is meant to last like poly but perform (NVH) like rubber.

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post #6 of 39 (permalink) Old 02-23-2017, 10:44 AM Thread Starter
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Personally i have bone stock FE2 80k original parts (other than Whiteline strut mounts) , which will all be replaced soon with Koni's and possibly Tein springs.

2009 Pontiac G8 GT - Pacific Slate Metallic

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-2009 Colorado Z71 V8
-2003 S10 ZR2
-1997 Camaro Z28
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post #7 of 39 (permalink) Old 02-23-2017, 12:01 PM
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Quote:
Originally Posted by FastKat View Post
SuperPro (I think) has two mounts - one that is like ever other mount and one that is sort of a "lite" poly mount. It's construction more closely follows the original design and it is supposed to add very little NVH. Part number should be SPF1590AK.
Carrying on with this. Based upon the post and review in the following thread, the SPF1590AK (Polyelast®, another trademarked name like polyurethane): strut mounts seem to be much better than the SPF1590BK (polyurethane) strut mounts. The SPF1590BK (polyurethane) would be similar to the Whiteline poly strut mounts and others out there. While the SPF1590AK (polyelast) would be like the OEM rubber (little-to-no NVH) but will actually last long. It is newer and cheaper as well.

SPF1590AK (polyelast): GTO Front Strut Mount with Bearing | SuperPro SPF1590AK

SPF1590BK (polyurethane): SuperPro SPF1590BK Front Upper Strut Mount w/ Bearing. SuperPro SPF1590BK

In hindsight, I kind of wish that I went with the SPF1590AK (polyelast - NVH of OEM rubber but long lasting) strut mounts since I'll be swapping everything out this weekend, but I'm just over the Whiteline polyurethane and looking forward to getting back to rubber (Pedders rubber HD strut mounts; new design). If and when these Pedders HD rubber strut mounts fail, I'll move over to the SuperPro SPF1590AK (polyelast) strut mounts.

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post #8 of 39 (permalink) Old 02-23-2017, 12:19 PM
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I've bought some SuperPro Polyelast's, but it'll be a few weeks before they get into the car. They're essentially the same hardness, and feel just like the same material.

When I get the other mounts off, I'd be able to tell for sure what the differences are if any.

'09 PSM G8 GT - Current Mods: Solo Axle-Back w/ X-Pipe OPG CAI. SuperPro Bushings (Front and Rear). BMR Sway Bars (Red)
Mods Planned: DOD-Delete, Stage 1C Livernois, Kooks Mids, GXP Trans Cooler, 2800 Circle-D Stall Converter, Differential (Max 3.45)
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post #9 of 39 (permalink) Old 02-23-2017, 12:51 PM
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Quote:
Originally Posted by Jova007200 View Post
I've bought some SuperPro Polyelast's, but it'll be a few weeks before they get into the car. They're essentially the same hardness, and feel just like the same material.

When I get the other mounts off, I'd be able to tell for sure what the differences are if any.
Well, the differences between the SPF1590AK (polyelast) and SPF1590BK (polyurethane) are quite obvious.

See the all rubber/polyelast construction (SPF1590AK - polyelast) and the dull rubber-looking material vs. the metal construction/sleeve under the bearing (SPF1590BK - polyurethane) and the shiny and hard plastic in the following pictures for comparison.

SPF1590AK (polyelast):








SPF1590BK (polyurethane):


Enough to increase NVH in my opinion. I suspect your OEM rubber ones will be similar in construction to the SPF1590AK (polyelast) strut mounts.

EDIT: Pedders 5851 HD rubber strut mounts for comparison.




strut mounts at 4000 miles - LS1GTO.com Forums

#754 of 1829: GXP
#23 of 67: LR, M6, Roof, Onyx/Red
#22 of 37: Summer-only Potenza tires

Last edited by GXP25; 02-23-2017 at 06:10 PM. Reason: Added Pedders' strut mount.
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post #10 of 39 (permalink) Old 02-23-2017, 01:40 PM
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I was referring to the stock mount style versus the PolyElasts.... I'm not blind. But perhaps I didn't clearly specify.

'09 PSM G8 GT - Current Mods: Solo Axle-Back w/ X-Pipe OPG CAI. SuperPro Bushings (Front and Rear). BMR Sway Bars (Red)
Mods Planned: DOD-Delete, Stage 1C Livernois, Kooks Mids, GXP Trans Cooler, 2800 Circle-D Stall Converter, Differential (Max 3.45)
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post #11 of 39 (permalink) Old 02-23-2017, 01:48 PM
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When I change mine in the spring, I will be going with a set of Moog's.

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post #12 of 39 (permalink) Old 02-23-2017, 02:15 PM
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Quote:
Originally Posted by Jova007200 View Post
I was referring to the stock mount style versus the PolyElasts.... I'm not blind. But perhaps I didn't clearly specify.
I know you were. I was just providing some insight for anyone else.

Quote:
Originally Posted by G8GTLVR View Post
When I change mine in the spring, I will be going with a set of Moog's.
There is zero evidence that the Moogs have been redesigned compared to the original GM mounts. And mind you, GM made a revision to the mounts and they still fail from what I've read. You'd be really wasting your money and time if you end up going with the Moogs (or Mevotech or anyone else that hasn't been mentioned above).

Your best bet is either Pedders (heavy duty real rubber that has been redesigned) or SuperPro SPF1590AK (polyelast, not to be confused with polyurethane: OEM rubber feel and comfort but long-term durability of polyurethane).

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post #13 of 39 (permalink) Old 02-23-2017, 02:31 PM
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Quote:
Originally Posted by GXP25 View Post
I know you were. I was just providing some insight for anyone else.
hehe I was just giving ya some grief.

'09 PSM G8 GT - Current Mods: Solo Axle-Back w/ X-Pipe OPG CAI. SuperPro Bushings (Front and Rear). BMR Sway Bars (Red)
Mods Planned: DOD-Delete, Stage 1C Livernois, Kooks Mids, GXP Trans Cooler, 2800 Circle-D Stall Converter, Differential (Max 3.45)
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post #14 of 39 (permalink) Old 02-23-2017, 02:55 PM
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Another FYI: The bearings are different between the SPF1590AK (polyelast) and SPF1590BK (polyurethane) strut mounts; the two cannot be interchanged. The SPF1590AK (polyelast) strut mount bearings are larger.

Quote:
Originally Posted by Jova007200 View Post
hehe I was just giving ya some grief.

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post #15 of 39 (permalink) Old 02-23-2017, 04:19 PM
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Like Jova, I'm waiting for spring to put my polyelast bushings in too. Just a thought, does the latest Chevy SS still have bushing problems? Maybe the latest GM one won't collapse as fast as the original design , '97 Cadillac Catera

'09 SRM GT. VCM Intake, Saxonpc MAF Screen 5:1, Cortex,1.85 Rockers/105# Springs, JBA shorty's, Solo H/F Cats, Solo Mach Balanced. BMR Sway bars, Superpro strut mounts, Whiteline Rear Subframe Bushing, Mevotech arms. PPV struts/shocks, Tein Springs. MPSS Tires
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post #16 of 39 (permalink) Old 02-23-2017, 05:19 PM
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Originally Posted by GT Drew View Post
Like Jova, I'm waiting for spring to put my polyelast bushings in too. Just a thought, does the latest Chevy SS still have bushing problems? Maybe the latest GM one won't collapse as fast as the original design , '97 Cadillac Catera
They seem to be having the same issue even though theirs is a different part number.

Strut Mounts Issues? - Opinions wanted

EDIT: Same new part number for all: 92272959

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Last edited by GXP25; 02-23-2017 at 05:50 PM. Reason: Part number.
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post #17 of 39 (permalink) Old 02-23-2017, 08:45 PM Thread Starter
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Well, ordered up some Polyelast mounts tonight and will be installing them sometime in the next few weeks, so I will be sure to post my impressions afterwards.

2009 Pontiac G8 GT - Pacific Slate Metallic

Previous Rides
-2009 Colorado Z71 V8
-2003 S10 ZR2
-1997 Camaro Z28
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post #18 of 39 (permalink) Old 02-23-2017, 10:03 PM
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Quote:
Originally Posted by G8GTLVR View Post
When I change mine in the spring, I will be going with a set of Moog's.
And you'll be replacing them in no time again.

Matt Jones
2009 Hot White G8 GT w/ premium & sport packages
Vararam CAI/Kook's Long Tubes/Corsa Cat Back/RPM Tune
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post #19 of 39 (permalink) Old 02-23-2017, 10:50 PM
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Seems that half the folks that switched to poly strut bushings notice increased NVH and half don't. I'm in the half that didn't notice any change in NVH. I want to point out that I watched my factory rubber bushings collapse so by 8500 miles I changed to poly. So I can't recommend rubber for strut bushings. They won't last.
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post #20 of 39 (permalink) Old 02-24-2017, 05:37 AM
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Seems that half the folks that switched to poly strut bushings notice increased NVH and half don't. I'm in the half that didn't notice any change in NVH. I want to point out that I watched my factory rubber bushings collapse so by 8500 miles I changed to poly.
I agree with this as some people are more sensitive than others.

Quote:
So I can't recommend rubber for strut bushings. They won't last.
That is quite subjective and vague and it all depends on how we classify strut mounts. From what I've read and agree with, strut mounts are a wear item, just like brake pads and rotors, struts and shocks, tires, etc.

While Pedders uses the same grade of rubber as the OEM piece, the surrounding ridges have been redesigned. One poster (LS1GTO.com) explained it as viewing the surrounding edges as a series of waves.



The OEM design troughs (sunken areas) are wider than the crests (raised areas). The Pedders strut mounts have wider crests and narrower troughs. It is the crests that make contact with the body of the vehicle and thus having wider crests provides a larger contact area. Also, Pedders' strut mounts have a larger ferule.

But yes, the Pedders strut mounts will also fail in time.

The SuperPro SPF1590AK (polyelast) strut mounts are a good replacement if they truly have the same feel as OEM rubber. I'll wait for some more reviews since I already have the Pedders mounts and will be installing everything tomorrow.

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