[STAGEUP]

I honestly didn't notice a change in NVH going to poly strut mount bushings. And I'm pretty darn picky about NVH.

 

[Jova007200]

Polyelast is essentially a polymer synthesized from polyurethane and elastomeric rubber. I did some reading, and it essentially is meant to act like rubber and resist breakdown and deformation like poly. There are lots of variations, so I didn't dig that deep into the actual composition.... as if that matters LOL.

Since here in NC I've only had one set of mounts fail, I would posit that the chemical exposure in certain areas leads to advanced wear. I'd say rock salt from areas that use it would be the best known culprit.

Like GXP25 said... it's a wear item like brakes, tires, etc.... Not much you can do but replace them when they go.

 

[GXP25]

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.

The Moog material I was speaking about is called "thermoplastic" and seems to be far inferior in comparison to polyelast.

... IN WITH THE NEW

Moog makes their sway bar bushings with two materials; rubber and thermoplastic. Moog's rubber bushings are designed to restore your smooth OE ride, getting you back to your original performance. The thermoplastic is stiffer and more durable. With thermoplastic bushings installed your NVH might increase slightly, but your performance will not only be restored, it will be improved. So if you're looking to fix up your daily driver, or reduce your lap time, Moog has you covered.

 

[Jova007200]

Actually, Polyelast is a thermoplastic as well.... As far as the properties of each, I wouldn't read the marketing brochure to discover what the difference really is. You have to look at the actual engineering bulletins on each material....

Were the marketing brochure's to be believed, everybody has the best part available.

Edit... P.S. for the record, I can't really find the appropriate EB since there are so many variations of PolyElast that I don't know which one to pick.... aside from asking for that EB from the manufacturers using it (if they'll provided)

 

[G8GTLVR]

I think I am going to get a set of Whiteline Poly bushings. I have all Whiteline bushing in my GTO and they are great.

 

[G8GTLVR]

I installed the Whiteline poly strut mounts in the G8 this past weekend. Other than my steering feeling a bit smoother, I cannot tell a difference in the ride quality.

I think the Whiteline poly material is a softer durometer. On my GTO, I found also that the Whiteline poly subframe bushings also did not give a harsh ride.

I think Whiteline is the way to go.

 

[GXP25]

Well it looks like the Pedders mounts are starting to collapse. I'll be looking into the SuperPro SPF1590AK (polyelast) mounts when the replacement (warranty; it was leaking oil up top) Koni strut insert comes in.

 

[Jova007200]

The Polyelasts are good quality parts, but I didn't like the bearings. I reused the bearings I had (inspected them thoroughly) since they had only been in the car for about a year.

It might have been just me. Anyhow, overall the quality and feel aren't going to be identifiable different.

 

[GXP25]

The Polyelasts are good quality parts, but I didn't like the bearings. I reused the bearings I had (inspected them thoroughly) since they had only been in the car for about a year.

It might have been just me. Anyhow, overall the quality and feel aren't going to be identifiable different.

Aren't there different sized bearings (the plastic rings)?

I currently have Whiteline polyurethane strut mounts and their bearings (sitting in the garage) and the Pedders strut HD rubber strut mounts and bearings.

 

[Jova007200]

It wasn't the size of the bearings. Mostly, it was the overall perceived quality of them. They were not smooth in operation and didn't handle compression well.

The mounts are as good as can be expected.

We'll see how they measure up in longevity. Any mount will eventually wear out, but I expect these to never have to be replaced again (or at least not in a reasonable amount of time) given the amount of driving I intend to do going forward with the G8. 4-6k driving a year means these should last a good long time.

 

[GXP25]

It wasn't the size of the bearings. Mostly, it was the overall perceived quality of them. They were not smooth in operation and didn't handle compression well.

Oh, I honestly thought that there was a size difference in the rings (not the actual balls) which made then incompatible with the other mounts out there.

The mounts are as good as can be expected.

We'll see how they measure up in longevity. Any mount will eventually wear out, but I expect these to never have to be replaced again (or at least not in a reasonable amount of time) given the amount of driving I intend to do going forward with the G8. 4-6k driving a year means these should last a good long time.

Yeah, the Whitelines I pulled off looked a bit worn on the sides but they were nowhere near collapsed, which was good.

My ride quality was deteriorating and I attributed it to the strut mounts. Of course, it was the struts. However, since this point of contact was rubber from stock, why not reinstall rubber, especially considering the forces involved. But now that there's a mount with the durability of polyurethane and the alleged comfort/NVH of rubber, why not?

 

[Jova007200]

The chemical reliability will only really be important to folks who live and drive in climates that consistently use rock salt.

Here in NC, I have learned that rubber holds up very well.

As far as road comfort, the front end responds about as expected after installing the Super Pro control arms and radius rods. It's harsher than before, but not to such an extent that it is noticeable at normal speeds. So, I would say that the mounts are indeed comparable to rubber as far as road feel is concerned.

Do they "deflect less?" Considering the hardness of the original stock mounts, not really. It isn't like the OEM stuff was flimsy.... After completing an entire bushing job, I can honestly say the mounts have had an impact that is indiscernible.

I bought them more as an experiment, so I'd not say I wouldn't buy them again. Come back in 7 years and I'll tell ya LOL....

 

[GXP25]

so I'd not say I wouldn't buy them again. Come back in 7 years and I'll tell ya LOL....

So you'd buy them again? Double negatives. :laugh2:

 

[BMR Sales]

Oh, I honestly thought that there was a size difference in the rings (not the actual balls) which made then incompatible with the other mounts out there.



Yeah, the Whitelines I pulled off looked a bit worn on the sides but they were nowhere near collapsed, which was good.

My ride quality was deteriorating and I attributed it to the strut mounts. Of course, it was the struts. However, since this point of contact was rubber from stock, why not reinstall rubber, especially considering the forces involved. But now that there's a mount with the durability of polyurethane and the alleged comfort/NVH of rubber, why not?

There are two different Bearing "Ring" sizes - the SuperPro Elastomer & Polylast Bearing do not interchange

 

[Jova007200]

So you'd buy them again? Double negatives. :laugh2:

I know.... I meant to say "I can't say..."

Largely, it is an experiment. I have yet to really be able to fairly rule on them.

 

[GXP25]

There are two different Bearing "Ring" sizes - the SuperPro Elastomer & Polylast Bearing do not interchange

Thank you for the reply!

I knew I had read something about that.

Is the Polyurethane/elastomer mount's bearing or the Polyelast mount's bearing more desirable?

EDIT:

I knew I had read something about that.

Oh course, because I previously stated it in this thread on the first page: http://www.g8board.com/forums/7-suspension-brakes/257178-best-rubber-strut-mounts.html#post3420825

:|

 

[GT Drew]

Bearing are rarely an issue. The only time people have problem is with install errors. If the mount is not fully seated on the spring plate, the bearing can catch and break on the spring plate inner lip.

 

[Jova007200]

A long while ago, I got into a debate with an engineer. We were talking about Micron Gauges, and he insisted that I had my terminology wrong when describing an aspect of the sensor. He was insistent in his correctness, and I yielded.

He came back to me and apologized and he said, "Mike, stick to your guns. You shouldn't yield just because you think the guy next to you has more experience or that he is smarter than you. You were right."

I learned to stick to my guns, and I'm doing it now.

I followed the installation procedures correctly for the bearing installation, and I verified it twice. These two bearings were the only ones to have ever failed on me during that procedure, period.

Consider it what you want, but sometimes there are other reasons problems arise than just somebody's error.

That said, we're good, I'm not mad. However, I am opinionated, and this time I am sure.

 

[Jova007200]

That said, I am 100% willing to entertain the idea that I simply got a defective set of bearings. Still, it was my experience, and I was sharing it.

 

[GXP25]

Replaced the partially collapsed Pedders HD strut mounts yesterday with the SuperPro SPF1590AK (polyelast) along with replacing the failed Koni strut instert (warranty).

These mounts feel good. I still have a clicking noises when braking and turning sometimes and I think it may be the driver side sway bar endlink.

I also changed out the sunroof motor with a 2008 motor (set and forget); good mod and easy to replace.