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Old 08-28-2011, 02:24 PM   #1
A-man07
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Default Bushing Durometer Master List

As promised in another thread, I'm compiling a master list of the durometer rating of both OEM, Group N and aftermarket Subaru bushings. I'll add to the list as different bushings are available to me to measure.

The measuring tool is a Rex Gauge 1500 Durometer that measures in the standard Shore A scale. Gauge: http://www.rexgauge.com/model/item/32

Scale info: http://www.matweb.com/reference/shore-hardness.aspx

Technical notes on "durometer" and measuring it can be found here: http://www.rexgauge.com/content/tech_notes

OEM

07 STI transverse link, 83 (this is the rear bushing on the front lower control arm, "ALK")

07 STI lateral links, 75 - the rear inner link bushing is 70

07 STI engine mounts, 55

07 STI rear differential mount, 65 (voids present)

Group N

Transverse links, 75 (voids present)

Lateral links, 80

Engine mounts, 88

Tranny mount (6 spd), 88

Trailing link, rear, 80


Aftermarket

Whiteline Plus front lower control arm bushing, 85

Kartboy "Race" outrigger bushings, 85

GT Spec ALK, 70 (This info comes from Calvin at GT Spec. I have not actually measured this one but there is anecdotal evidence to think that the actual rating is higher.)

Whiteline "standard" ALK, 85

Whiteline "comfort" ALK, 75 (as listed by WL, I haven't actually measured)

Whiteline "race" ALK, 95 (as lisyed by WL, I haven't actually measured)


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Last edited by A-man07; 09-17-2011 at 02:50 PM.
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Old 08-28-2011, 02:56 PM   #2
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This will be good information. Once more info is compiled it would be nice to sorry it by part type and maybe even get pictures of each. I will hunt around for my stock WRX bushings and whatever else I have sitting here and send them out to you. I know I have quite a few. Good work so far.
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Old 08-28-2011, 07:33 PM   #3
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Very cool, I have always wanted to see this info but have not got my hands on a testing device yet. I'll look around and see if I have any bushings of interest around that I can offer up. Do you have any specific ones you would like to test? Before you get too far into the testing can you catalog some other details also?
  • was it a new bushing
  • was it a used bushing - if so estimated age/miles

Also might be good to define the testing procedure and retain it for each bushing (reduce variability as much as possible):
  • hold a consistent material temperature between each tested bushing (not sure what ASTM suggests but maybe 70 degF or similar?)
  • identify the test location (on bushing), also hold consistent when testing similar bushing
  • are these averaged measurements (how many measurements taken)
  • or are these single measurements

I think what you are doing will help satisfy a few people's curiosity on bushings.
**Sounds good. Just thought that those details would be good to have in the back of our thoughts when comparing the measured numbers.**

Last edited by JarHarms; 08-29-2011 at 09:08 AM.
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Old 08-28-2011, 08:02 PM   #4
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Please measure the 3 different WL ALK bushings when you can... and thanks for posting the info.
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Old 08-28-2011, 08:30 PM   #5
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Quote:
Originally Posted by JarHarms View Post
Before you get too far into the testing can you catalog some other details also?
  • was it a new bushing
  • was it a used bushing - if so estimated age/miles

Also might be good to define the testing procedure and retain it for each bushing (reduce variability as much as possible):
  • hold a consistent material temperature between each tested bushing (not sure what ASTM suggests but maybe 70 degF or similar?)
  • identify the test location, also hold consistent when testing similar bushing
  • are these averaged measurements (how many measurements taken)
  • or are these single measurements?
All the OEM bushings are used and the year model they come from will be posted.

The test location is my workshed. The durometer is a pen-type gauge and you press it into the material. The tests are repeated until the same reading results multiple times using the same technique as closely as possible. Temp will generally be 70-80*F

Quote:
Originally Posted by chimchimm5 View Post
Please measure the 3 different WL ALK bushings when you can... and thanks for posting the info.
I have a WL "sport" on my car which will be measured in a week or two. If you or anyone wants to provide me with a "comfort" and a "race" version I'll measure it and send it back to you, however, WL lists the comfort version as 75 and the race as 95.

Last edited by A-man07; 09-05-2011 at 07:01 AM.
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Old 08-28-2011, 09:32 PM   #6
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Quote:
Originally Posted by A-man07 View Post
GT Spec ALK, 70 (This info comes from Calvin at GT Spec. I have not actually measured this one.)
This is either a mistake on Calvin's part or on an atypical scale. Well, I guess the numbers for the STi bushing you measured could be high compared to the technique the GTSpec guys were using. The rubber in a new GTSpec ALK is noticiably harder than the OEM RS/WRX bushing, the OEM STi bushing, and very close to the same as the Group N bushing (close enough I wouldn't want to guess without an actual durometer). Yes, I've had all of them in the same place at the same time to compare. I would estimate that the GTSpec's bushing, when new, is somewhere between the Turn in Concepts Comfort and Race (though MUCH closer to the comfort) versions of their rear diff mount bushings. I'm not sure if there are published durometers from TiC for those bushings.
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Old 08-29-2011, 05:51 AM   #7
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Quote:
Originally Posted by williaty View Post
This is either a mistake on Calvin's part or on an atypical scale. Well, I guess the numbers for the STi bushing you measured could be high compared to the technique the GTSpec guys were using. The rubber in a new GTSpec ALK is noticiably harder than the OEM RS/WRX bushing, the OEM STi bushing, and very close to the same as the Group N bushing (close enough I wouldn't want to guess without an actual durometer).
My feeling is that "70" is a mistake on his part. When I first called and asked him he told me the hardness was "65%". When I told him I didn't think that was correct he told me he would call the factory and double check. When I talked to him again is when he quoted me the 70 and he said they told him a stock bushing was 50. Knowing the quote for the stock bushing was incorrect I just thanked him. My hope is I will have an actual bushing to test at some time.

As you can see from the list, the stock transverse link on an 07 STI is quite firm and I do suspect is the same as the Group N version that is sold through Subaru parts dealers (edit: incorrect as seen in the updates in the master list). I should have a set of used Group N transverse links waiting for me at the post office today - at least that is what they were sold to me as from the classifieds. Hopefully I can measure them tonight.

Last edited by A-man07; 09-05-2011 at 06:58 AM.
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Old 08-29-2011, 08:55 AM   #8
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wow this is great thanks for post this up!!!!!!
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Old 08-29-2011, 08:15 PM   #9
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Originally Posted by rexworx View Post
wow this is great thanks for post this up!!!!!!
You're welcome.

So these are what I was sold as Group N transverse links...



...which honestly I had a hard time believing but I confirmed with a pic on the 'net. This makes me quite sad I sold my stock 07 STI links which are not only firmer but don't have the voids and are substantially beefier. Anyway, they are Shore A 75 durometer (added to the list in post #1).
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Old 08-29-2011, 08:36 PM   #10
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^^whoa that sucks.

the wrx ones have the voids too, the ones that came with my 04-06 sti control arm assembly had firm rear bushings, were solid, and came with solid rubber spacers(the wrx one had gapped spacers)
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Old 08-29-2011, 11:17 PM   #11
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This thread makes me want to get one of those testers and test everything on the car and in my parts pile! Then I looked at the price of the tester.

If you are interested I have some 3g stuff. Too bad I already have the Group-N LCA bushings in the car, I have all 3 types, Legacy/Impreza/GroupN would love to know the readings on all. I have some other Group-N 3g stuff you could test before I swap it in.
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Old 08-30-2011, 05:28 AM   #12
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^^^I PM'd you my address.

I forgot I have a few extra Group N lateral link bushings in the freezer. I'll thaw them and list in #1.

Last edited by A-man07; 08-30-2011 at 08:22 AM.
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Old 08-30-2011, 12:29 PM   #13
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All of our suspension bushings are a Shore A 95. Our differential bushings and shifter bushings vary depending on application.

Tony
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Old 08-31-2011, 09:50 AM   #14
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I'll have to look up the drawing for the current production Legacy strut mounts. As of a few months ago we make them.
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Old 09-04-2011, 06:08 PM   #15
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Adding to 1st post WL standard ALK 85, and Group N engine and tranny mounts, 88
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Old 09-04-2011, 07:39 PM   #16
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Quote:
Originally Posted by A-man07 View Post
You're welcome.

So these are what I was sold as Group N transverse links...



...which honestly I had a hard time believing but I confirmed with a pic on the 'net. This makes me quite sad I sold my stock 07 STI links which are not only firmer but don't have the voids and are substantially beefier. Anyway, they are Shore A 75 durometer (added to the list in post #1).
those are not the group n bushings that I am familiar with
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Old 09-04-2011, 07:46 PM   #17
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Quote:
Originally Posted by Uncle Scotty View Post
those are not the group n bushings that I am familiar with
They look just like the Group N transverse link bushings I ordered for a customer about a month ago. Part numbers B0200FE010 and B0200FE000.
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Old 09-04-2011, 08:18 PM   #18
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Quote:
Originally Posted by williaty View Post
They look just like the Group N transverse link bushings I ordered for a customer about a month ago. Part numbers B0200FE010 and B0200FE000.
maybe I'm wrong....but the ones I last installed for somebody several years ago were solid(no slotted) and the rubber was quite firm
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Old 09-05-2011, 04:02 AM   #19
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MSI engine and tranny mounts?
Cusco engine and tranny mounts?
Whiteline "RACE" ALK?
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Old 09-05-2011, 07:08 AM   #20
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Quote:
Originally Posted by SoCal_Scooby View Post
MSI engine and tranny mounts?
Cusco engine and tranny mounts?
Whiteline "RACE" ALK?
MSI doesn't list a tranny mount in their catalog but their engine mounts are solid. Solid equates to 100 on the Shore A scale but solid is as solid does.

Send me some Cusco mounts and I'll measure them.

As mentioned above, Whiteline lists their "race" ALK as being 95 durometer urethane.
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Old 09-05-2011, 01:17 PM   #21
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Quote:
Originally Posted by Uncle Scotty View Post
maybe I'm wrong....but the ones I last installed for somebody several years ago were solid(no slotted) and the rubber was quite firm
Perhaps those were spec-c bushings, which came stock on 04-06 (not sure about 07) STIs.
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Old 09-06-2011, 09:01 AM   #22
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Our earlier DSS kits and lateral links used a 90a bushing. We have since switched to TIC Graphite bits that are 95a in our lateral links, trailing arm, and DSS kits.

Our tranny mount and insert bits are either solid or with a bearing.
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Old 09-06-2011, 10:34 AM   #23
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How are you testing the durometer of the fluid filled bushings? I mean, just because the rubber is a certain duro doesn't mean the bushing itself reacts the same way if its voided or fluid filled, etc. For example, you could possibly have a 95 duro rubber bush that is voided that reacts the same as a 60 duro solid. Its nice to have some data point on the stock bushings but its not the end of the story (depending on the voiding, fluid filled, etc. design).
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Old 09-06-2011, 12:21 PM   #24
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Quote:
Originally Posted by Arnie View Post
How are you testing the durometer of the fluid filled bushings? I mean, just because the rubber is a certain duro doesn't mean the bushing itself reacts the same way if its voided or fluid filled, etc. For example, you could possibly have a 95 duro rubber bush that is voided that reacts the same as a 60 duro solid. Its nice to have some data point on the stock bushings but its not the end of the story (depending on the voiding, fluid filled, etc. design).
Yes, it is very possible, even likely that they'd react differently. I've not tested a fluid filled bushing but I would if someone sent me one. I'll note in the 1st post if the bushing has voids or fluid filled.
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Old 09-06-2011, 01:54 PM   #25
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Perhaps pictures would be a good addition to this thread. Describing voids is nice, but seeing it is better. I can give up my #2 post if you need more room.
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