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10 Forester X Autotragic
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Discussion Starter · #1 ·
This is being written to provide some information about using STi control arms on 2009 to 2018 foresters.

modifying your vehicle is inherently dangerous and you assume the risks with this information.

The 2011+ STi aluminum arms are significant because they have a pillowball in rubber for the rear control arm bushing that is less prone to failure, in my experience, than the rear bushing that plagues every subaru in recent years. When I compared geometry of the 2011 arms and my SH steel arm are were identical, there is no gained caster or track width. Additionally, the sway bar mounting ears are the same with as the steel arms. When using the 2011-2014 STi Arm there is the issue of the STI rear bushing not being as spaced down as far as the forester. The factory steel arms spacing with the double sided stud, spacer and bushing is 80mm from the body to the the lower bracket. The 2011-2014 aluminum arm spacing is 70mm, so it is about 10mm too short for the forester. Part 20126FG001 which is the rear spacer from the non lifted subarus double sided stud and happens to be 10mm can be used to make up the difference. For reference the spacer on the forester double sided stud is 20mm.

STi Control arms:
-2008-2010 “GR”
, Aluminum and have same rear bushing as found in forester control arms, uses the forester style double sided stud in rear. These arms are not an upgrade in my opinion.

-2011-2014”GR/GV”, Aluminum and have pillowball (heim joint) encapsulated in rubber for rear bushing, spacer on top of pillowball is 10mm short of what is needed for the forester, 20126FG001 is the 10mm rear spacer from the non lifted subarus double sided stud and can be used to make up the difference to use these arms.

-2015+ “VA” , Aluminum and have pillowball (heim joint) encapsulated in rubber for rear bushing, spacer on top of pillowball is 10mm longer than the 11-14 STi arms and is correct spacing forester making it a direct fit. The 2015+ WRX share the same front control arm with the STI., It is safe to assume this fitment will carry through until the STi/WRX move to a new platform, AKA body code, at which time we would have to verify fitment.

There is NO information that I have found suggesting that there is a harder rubber variant for the 2011+ rear bushing, a "group N" bushing if you will.

Rear Bushing Bolt:

901000377, The rear long bolt to replace the double sided stud

Forester Platforms:
-SH 2009- 2013
, No know issues at this time with fitment of 2011+

-SJ 2014 - 2018, One member noted they "Needed to trim/remove 2 small metal panels as the STI LCAs are larger and will get in the way". Another member noted that the Arms are shorter width than stock SJ arms and caused issue with camber, additionally the swaybar tabs did not align. more information or pictures are needed, proceed at own risk of adapting.

There is no difference between XT(turbo) and non-turbo front control arms for these years



NOTE
I have no idea about 2019 Foresters, but I would be glad to add the information if anyone finds out.

Mevotech aluminum OEM aftermarket control arms PN:CMS80181 and CMS80182 will not work with 09-18 foresters. They are narrower and meant for 05-09 legacys. Additionally, they are not the pillowball style rear, just a solid rubber bushing.
 

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2017 Forester XT Touring CVT
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This is being written to provide some information about using STi control arms on 2009 to 2018 foresters.

*modifying your vehicle is inherently dangerous and you assume the risks with this information.*

The 2011+ STi aluminum arms are significant because they have a pillowball in rubber for the rear control arm bushing that is less prone to failure, in my experience, than the rear bushing that plagues every subaru in recent years. When I compared geometry of the 2011 arms and my SH steel arm are were identical, there is no gained caster or track width. Additionally, the sway bar mounting ears are the same with as the steel arms. When using the 2011-2014 STi Arm there is the issue of the STI rear bushing not being as spaced down as far as the forester. The factory steel arms spacing with the double sided stud, spacer and bushing is 80mm from the body to the the lower bracket. The 2011-2014 aluminum arm spacing is 70mm, so it is about 10mm too short for the forester. Part 20126FG001 which is the rear spacer from the non lifted subarus double sided stud and happens to be 10mm can be used to make up the difference. For reference the spacer on the forester double sided stud is 20mm.

STi Control arms:
-2008-2010, Aluminum and have same rear bushing as found in forester control arms, uses the forester style double sided stud in rear. These arms are not an upgrade in my opinion.

-2011-2014, Aluminum and have pillowball (heim joint) encapsulated in rubber for rear bushing, spacer on top of pillowball is 10mm short of what is needed for the forester, 20126FG001 is the 10mm rear spacer from the non lifted subarus double sided stud and can be used to make up the difference to use these arms.

-2015+ , Aluminum and have pillowball (heim joint) encapsulated in rubber for rear bushing, spacer on top of pillowball is 10mm longer than the 11-14 STi arms and is correct spacing forester making it a direct fit. *The 2015+ WRX share the same front control arm with the STI.*, **It is safe to assume this fitment will carry through until the STi/WRX move to a new platform, AKA body code, at which time we would have to verify fitment.**

*There is NO information that I have found suggesting that there is a harder rubber variant for the 2011+ rear bushing, a "group N" bushing if you will.*

Rear Bushing Bolt:

901000377, The rear long bolt to replace the double sided stud

Forester Platforms:
-SH 2009- 2013, No know issues at this time with fitment of 2011+

-SJ 2014 - 2018, One member noted they "Needed to trim/remove 2 small metal panels as the STI LCAs are larger and will get in the way" *more information or pictures are needed.*

*There is no difference between XT(turbo) and non-turbo front control arms for these years*


NOTE
I have no idea about 2019 Foresters, but I would be glad to add the information if anyone finds out.

Awesome , thank you.
 

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2010 Forester XS 4-AT
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98 Posts
Can you clarify for me that the 08-14 sti arms can fit an SJ forester? I currently have them on my SH but I would like to get an SJ XT. I have the first gen sti 08-10 arms and replaced them with poly bushes.
 

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10 Forester X Autotragic
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Discussion Starter · #6 · (Edited)
Yes, 08-10 arms will work on an SJ. They are essentially a direct replacement for 09-18 foresters.

Since the rear bushing diameter on the 08-10 is smaller that 11+, I would imagine that you will not run into the issues James06 did, but then you might just have to try it and report back.
 

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2014 Forester Really...?
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18 Posts
So this appears to be about the rear control arms only. Is there any information about the front control arms for the SJ using STI control arms since I would like to remove the stamped steel/pressed bushing setup currently.
 

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2014 Forester Really...?
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18 Posts
@TSR85 Nm, the pictures helped explain. My impression was that you were talking about the rear control arms since I didn't see the pictures on the phone when I saw the thread.
 

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10 Forester X Autotragic
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Discussion Starter · #10 ·
GD STi got aluminum lateral links(cant be used with multilink rear), but the GR+ there is nothing special about STi rear control arms, they are essentially the same as the rest of the cars.
 

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2017 Forester XT
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76 Posts
No trimming at all. Straight bolt in. Had to buy the bolts to replace the studs but I planned for that also the 10mm spacers. Was very SCARY driving to the alignment shop was like I was driving on ice. Thanks they where only 2 miles away.
 

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2014 Forester CVT
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13 Posts
I just installed these lower control arms on an 2014 Forester 2.5l Premium. Basically a strait forward install, without a ball joint removal took it took much longer beating the ball joint out of the steering knuckle.

I also replaced the sway bar bushings & end links which I needed to cut the studs to remove.

After I got everything installed I noticed that the sway bar links looked like the top end was kicked outboard more so than the lower end. I took a measurement from the lnboard face of the link mount on the control arm to the bolt that attaches the front of the control arm to the car. Seems that the link mounting plate is ~1/4” closer to that front mount bolt than the original control arm Configuration. This is form memory but I will measure it again to make it clear to me.

The brackets that have been mentioned on the 2014+ I removed because it looked to me that it was just touching the
control arm & I wasn’t sure if it would be worse when the suspension was fully loaded. I couldn’t figure out what they are for , nothing attaches to them yet they are right there in the middle of all the bracing & mount. Looking at the size of the steel bar that forms the bracket shape I’m thinking that it there to protect that mount bolt from getting hit with debris. A solid shot would shear that control arm mount bolt . The bar in that bracket is substantial . I was going to leave them out but now I’m just going to massage the area that may touch the control arm on the bench grinder.

The car now handles much better . Prior I had the wash board effect on sweeping right hand bends at 60 and above and general a raggedy harsh ride quality , to be expected with 118k miles .

I do have a banging or hard tapping on right turns only all other maneuvers is firm and quiet. I’m thinking end links binding .

Anyone else have an end link misalignment like mentioned above ? Maybe end links from the wrx would be a better
fit ?

Lower control arm used was the last mentioned above for the 2015+ wxr.
Here are some pics of the installed arms. Notice the light colored area adjacent to the pillow bushing, that is the location of that bracket. You can see the thickness of the steel bar used to form it. Kind thick no?
 

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2016 Forester XT Premium
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No trimming at all. Straight bolt in. Had to buy the bolts to replace the studs but I planned for that also the 10mm spacers. Was very SCARY driving to the alignment shop was like I was driving on ice. Thanks they where only 2 miles away.
I forgot to ask! Did you get the 11-14 WRX LCAs or did you get the 15-18 LCAs?

Thanks again!
 

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2014 Forester XT
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7 Posts
No this is a pretty old thread but have just replaced the front lower control arm in a 2014 XT with the aloy0017 from super pro with help from this forum. Didn’t realise these had additional castor built in (0016 is the standard) but looks as though this is just a 20mm space to top of the rear bushing which means you don’t need to use the old 20mm spacer from the original double ended stud. Having said that after putting these on something is way off whack with the alignment. Looks like massive toe out and excess positive camber. For others who have done this is that expected? I was going to get it aligned anyway but it’s barely driveable.
 

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10 Forester X Autotragic
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Discussion Starter · #20 ·
Anytime you change anything like controls arms, at minimum a real alignment check is mandatory. If you are using after market parts that may be spaced differently or take the strut off the knuckle then a full alignment is mandatory.
 
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