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Old 01-10-2013, 07:17 PM   #1
gsrcrxsi
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Default 2011 STi Front LCAs on 2010 WRX

So I've been considering doing this but i have some concerns.

Why do this? - The STi arms are aluminum and lighter, which is cool, but not the real motivator. the 2011+ STi arms have a rubber isolated sealed pillowball (spherical) bushing. This should/will improve feel without much detriment to NVH. Though no additional caster will be gained.

Why not go with WL or other poly options? - Constant regreasing, more NVH, documented poly failures, etc. im just not a fan of poly in general for applications that have/require a lot of movement.

now onto my real questions. I've searched a bit, and have seen some mention of this on iwsti, but being an sti geared site, not much in the way of answers for me.

I'm fairly certain that installing these arms will increase track width by 0.5-0.8", does anyone know exactly how much?

will the increased track width require longer axels? or will the WRX axles suffice fine? risk of pulling the axles out of the tranny?

since these are longer at the lower attachment point of the knuckle, this will cause more negative camber correct?

im pretty sure this would require some issues with the front sway bar as well. either an STi bar or custom (which ive been thinking about anyway) would be required.

anything else i havent thought of?
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Old 01-11-2013, 11:37 AM   #2
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Give 'er a bump
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Old 01-11-2013, 05:11 PM   #3
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look up the part numbers for the 2008-2010 wrx axels then the 2011-2013 axels. if they are the same length then you got your answer, if not then you also got your answer.
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Old 01-11-2013, 05:34 PM   #4
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part number isnt a definitive indication that the parts are the same/different dimensions. they could have used a thicker axle (not longer) in the 2013, or differences in the CV joint, etc. Both would cause a different part number, but not necessarily be a different dimension in length. just like how 08 and 09-10 struts are the exact same physical dimensions, they have different part numbers.

additionally ive seen some reports that the 11-13 WRX doesnt use a different LCA than the 2008-2010. and that the difference in track width is coming from somewhere else (not confirmed but ive seen it mentioned)

id like some more definitive answers on these points as well if anyone knows.

Last edited by gsrcrxsi; 01-11-2013 at 05:43 PM.
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Old 01-11-2013, 05:43 PM   #5
gsrcrxsi
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im on subarugenuineparts.com, trying to find part numbers, but they arent listing any. only item descriptions.

any place i can look up part numbers?

edit, opposedforces gives me numbers, but im not sure how reliable it is. its listing 07- with no distinction between 08-10 and 11+.

Last edited by gsrcrxsi; 01-11-2013 at 05:52 PM.
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Old 01-12-2013, 02:25 PM   #6
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bump.
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Old 01-13-2013, 07:43 AM   #7
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By the way after seeing this thread I am actually interested in doing this my self on my 2012.
Would be cool to get some better front end response and a decreased in weight including unsprung weight. How much would a set of front LCAs cost?

EDIT: found this http://www.wrxforums.com/forums/13-h...-arms-wrx.html
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Old 01-13-2013, 07:02 PM   #8
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yeah i posted there. seems to be 50/50 on needing new axles or not.
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Old 01-15-2013, 10:58 AM   #9
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i have 2011sti alu control arms on my 2011wrx. direct bolt in... you need the rear bolt as it's different from oe one... they were about 2lbs lighter per side. was surprised.

no clue what fits on 08-10wrx....
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Old 01-15-2013, 01:12 PM   #10
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Quote:
Originally Posted by Robin2 View Post
i have 2011sti alu control arms on my 2011wrx. direct bolt in... you need the rear bolt as it's different from oe one... they were about 2lbs lighter per side. was surprised.

no clue what fits on 08-10wrx....
can you confirm if you got any extra negative camber? there have been some reports that the 2011+ WRX actually uses the same LCA as the the 08-10, and that the extra track width is coming from a difference in the hub/wheel offset. if you saw added neg camber, that might support this theory. but there seems to be conflicting information. some people say 2011+ WRX is the same as the STi, some say it is the same at 08-10 WRX.

still trying to find part numbers to cross-reference LCAs and Axles between 08-10 and 11+ WRX. any help there?
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Old 01-15-2013, 01:57 PM   #11
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it changed nothing on 11wrx. why? cause 11+ wrx are wide track exactly same as the STI's.

Stock camber i could get near -2 even before the control arm change. Castor was over 6 degrees.

for part number, i'll have to dig a bit. i don't have access to that email account at work

here's a pic of 11sti control arm vs 11wrx control arm

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Old 01-15-2013, 02:01 PM   #12
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found this on iwsti

901000377 (quantity: 2)
20202FG040
20202FG050
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Old 01-15-2013, 04:53 PM   #13
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you arent understanding what i am asking.

yes, i know that. those are the part numbers for the STi Aluminum control arms and the STi bolt. i believe those part numbers are superseded by new numbers anyway (1 at the end vs 0)

what i want is the part number for the WRX steel control arms for 08-10 and for 11+. someone on iwsti (likely the same thread you go those from) mentioned that the NEW 11+ WRX used the same control arm as the OLD 08-10 WRX. IF that is the case, then the 11+ WRX would receive the same change in geometry that a 08-10 WRX would. someone on iwsti (with a 2011 WRX) stated/claimed that he gained an additional degree of camber with the STi arms.

you really cant tell from the pic if they are different dimensions or not.

in all honesty, im not so much worried about the camber change, an additional degree would be nice, and i could dial it back out with the stock bolt.

im MORE concerned with the axle length. it seems to be 50/50 if these will NEED longer axles or not. someone posted hearsay on iwsti (from a legacy forum) that they did this mod and it pulled the axles out causing a leak. where as 1 or 2 people with 08-10's stated that they did this without changing the axles and without hurting anything. im trying to find out if the 2011WRX uses longer axles or not.
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Old 01-15-2013, 04:55 PM   #14
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also, when you purchased those 2011 STi LCAs, did they come with the balljoint attached like that? or did you buy new ball joints in preparation of the swap?
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Old 01-16-2013, 10:45 AM   #15
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control arm came from subaru as such with balljoing/bushings.

no clue on dimensions compared to 08-10wrx.

if / when i put on 2010struts with koni yellows, older struts will add more camber. This is probably the case where that 11wrx owner mentioned in your post.

just do a quick search, from bilstein struts from 08-10 on 11wrx got near -3 camber with OE camber bolts.
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Old 01-16-2013, 12:12 PM   #16
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good god man, stay on topic. this has nothing to do with struts adding camber lol. i KNOW they add negative camber. as will a longer LCA.

from pg 24 of the IWSTI thread: http://www.iwsti.com/forums/gr-suspe...ier-gr-24.html

Quote:
Originally Posted by Sabrewings
I'm pretty sure the wider stance come from wheel offset and not the control arm. The rear suspension has the same control arms on 2.5is, WRXs, and STIs. Also the 2011+ WRXs use the same front control arms as previous years despite having a wider stance.
Quote:
Originally Posted by caveguru
The swaybar endlink mounts do move out over 1/2" on each side going from the 2008-2010 WRX control arms to the sti control arms. Depending on which endlinks he uses he may need different endlinks. I'm surprised to hear that the 2011+ WRX front control arms are the same part as the 2008-2010 units. That would explain why I gained ~1 degree of camber going from the 2011 WRX arms to the 2011 sti arms. I could have gotten to more then -2 camber with just the stock bolts if I'd wanted to!
this is the information that im looking to debunk or verify. caveguru stated that he ganed a degree of camber from the LCA swap alone, not because of a strut change.
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Old 01-19-2013, 11:23 AM   #17
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Bump.
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Old 01-21-2013, 01:33 PM   #18
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Bump.
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Old 04-19-2013, 10:58 PM   #19
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well since this is now a one man show it seems.

I have:
2011 WRX front axles
WL KCA313 Roll Center Kit

I ordered:
20202FG042
20202FG052 (part #s changed again)
2x 901000377
2x 34160XA010 (09-13 Forester X/XT inner tie rod)
2x 34127AG000 (WRX tie rod lock washer)
4x Kartboy front endlink spacers. (seeing if i can get by with this method for now, i may have to change sway bars)
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Old 04-19-2013, 11:16 PM   #20
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Quote:
Originally Posted by gsrcrxsi View Post
well since this is now a one man show it seems.

I have:
2011 WRX front axles
WL KCA313 Roll Center Kit

I ordered:
20202FG042
20202FG052 (part #s changed again)
2x 901000377
2x 34160XA010 (09-13 Forester X/XT inner tie rod)
2x 34127AG000 (WRX tie rod lock washer)
4x Kartboy front endlink spacers. (seeing if i can get by with this method for now, i may have to change sway bars)
Goodluck! Interested in how this turns out.
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Old 05-03-2013, 10:00 AM   #21
gsrcrxsi
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got my control arms from Subaru (along with everything else i purchased)




dont try to take the boots off like i did for this pic. it was a royal pain in the ass getting them back on properly. if they arent PERFECT the boots will pop off through movement.

i will have direct comparisons between these and the 08-10 arms. since no one seems to know FOR SURE the dimensional differences. mainly exactly how much longer these are. so far all ive been able to work with is the track width difference numbers, but i dont know how much difference there is in the hub assembly (if any).

so for now, the plan is to use these LCAs, with 2011 WRX axles (should be longer) and the forester inner tie rods (should be longer). you cant use the STi inners apparently because the STi has a larger thread.
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Old 05-12-2013, 03:36 PM   #22
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Everything to be installed this week .


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Old 05-17-2013, 11:50 AM   #23
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ok i did this last night. the only thing different from my original plan, was i installed a sway bar meant for a 2011+ WRX or STi. so i ended up not using the spacers.

axles and tie rods are about 3/4"-1" wider, which may not be necessary to install just the arms, but i had to pull the steering rack to fix something else anyway. Also, due to increased angles on the arms and links when lifted, it will require a little bit extra length so I decided it was best to have the extra headroom if needed. so i replaced everything as my car has 92k on it too.

pics:

Last edited by gsrcrxsi; 05-17-2013 at 12:10 PM.
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Old 05-18-2013, 11:49 AM   #24
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Here is the alignment.



Here is how much more I have if I want more neg camber (still on stock camber bolts)



This is what the front wheel looks like. 17x9" +44 with a 245/40/17 tire.

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Old 05-21-2013, 03:07 PM   #25
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Now that you've done the fronts, are you looking to do the rear as well? I've only searched for this kind of info from wrxforums as that board is tailored to the 3G, but it's not nearly as active. Also, could you use the 2011+ WRX front inner tie rods as well as the foresters?
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