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Old 04-06-2004, 04:33 PM   #1
Richard Sierra
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Impreza WRX Has anyone done a complete swap of the

STi sedan suspension (including front control arms and rear lateral links) on a wagon?

(Tried the search didn't see anything)
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Old 04-06-2004, 08:55 PM   #2
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Hmm, that's an interesting idea. I would, of course, worry about wheel/tire clearance. There is a 20 mm difference in the tracks of the wagon and sedan in the front, 25mm in the rear (measured at the center of the wheel) and 35 mm difference at the outside of the wheel on the front. So depending on the wheel/tire combo you are running, you will need to roll the fenders.

It would be an interesting thing to try as there is a handling difference between the two vehicles due to the wider track of the sedan. though not that my amateur butt can feel it.!
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Old 04-07-2004, 09:25 AM   #3
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It was a loaded question. I have already done it. I have the V7 STi/RA struts, 04 pink springs, group N top mounts, front alum control arms, rear lateral links, sway bar end links, etc.

Although it is early, it seems to be a very good set up. The rear tires due rub slightly, but nothing on the front. The car has a nice stance not too low or high, and the front is slightly lower than the rear. The additional width fills out the wheel wells nicely.

I'll post pictures if anyone is interested.
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Old 04-07-2004, 09:27 AM   #4
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I would think that if you moved the wheels out 25mm they would be directly under the fender opening. That's why the sedan has those big fender flares. I've seen people put sedan flares on the front of the wagon but haven't seen anything done with the rear yet.

edit: Looks like I thought wrong. Maybe there is more room in front than I thought.
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Old 04-07-2004, 09:28 AM   #5
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Quote:
Originally posted by Richard Sierra

I'll post pictures if anyone is interested.
DUH

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Old 04-07-2004, 09:40 AM   #6
Richard Sierra
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Quote:
Originally posted by mrbigisbudgood
DUH

Is that a yes? (it's a total of 20mm, 10mm per side)
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Old 04-07-2004, 10:28 AM   #7
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What wheels and tires are you running with that setup? I've been thinking about doing this for a while..
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Old 04-07-2004, 10:29 AM   #8
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there were posts from over a year ago about STi/SPT sedan suspension kit will cause more positive camber than the wagon kit in the rear. (if all other suspension parts remain the same)

Sorry, I do not have the link to those threads. Try searching in "Archived" threads.
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Old 04-07-2004, 11:56 AM   #9
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Quote:
Originally posted by Richard Sierra
It was a loaded question. I have already done it. I have the V7 STi/RA struts, 04 pink springs, group N top mounts, front alum control arms, rear lateral links, sway bar end links, etc.

Although it is early, it seems to be a very good set up. The rear tires due rub slightly, but nothing on the front. The car has a nice stance not too low or high, and the front is slightly lower than the rear. The additional width fills out the wheel wells nicely.

I'll post pictures if anyone is interested.


Yes Pleeeeeease!!!!! Post Pics
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Old 04-07-2004, 12:53 PM   #10
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Quote:
Originally posted by xstar
there were posts from over a year ago about STi/SPT sedan suspension kit will cause more positive camber than the wagon kit in the rear. (if all other suspension parts remain the same)

Sorry, I do not have the link to those threads. Try searching in "Archived" threads.
They may have been by me as I have STi sedan takeoffs and there is more positive camber in front and rear than with the Wagon SPT suspension. Richard Sierra, have you gotten an alignment yet? The numbers would be interesting to see. Also your ride height seems to be the opposite of mine. My car is higher in the front than the rear. I'm surprised that the lateral links and control arms would effect ride height.
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Old 04-07-2004, 01:32 PM   #11
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Quote:
Originally posted by xstar
there were posts from over a year ago about STi/SPT sedan suspension kit will cause more positive camber than the wagon kit in the rear. (if all other suspension parts remain the same).
You'll get the extra pos. camber front and rear if you use the wagon front control arms and rear lateral links with sedan struts. However, combined with the sedan stuff, one would be fine, as far as geometry is concerned.

As an aside, I've compared the sedan and wagon struts on a car and I see now where the difference lay. The actual length of the struts is the same. The difference is actually in the "bracket" at the bottom of the strut where the 2 big 19mm bolts are. The sedan version extends outward about 10mm more than on the wagon. When a sedan strut is installed on a wagon the extra length forces the top of the knuckle farther out (the knuckle pivots from below) giving more positive camber. So with the sedan control arms and lateral links pushing everything out, the geometry, combined with sedan struts, should be fine on a wagon.

My only concern would be with the half shafts/CV joints. Are they different between the two cars? Are the sedan's also a bit longer? Most CV joints have quite a bit articulation and "stretching" possiblity, bit I wonder if, long term, there are wear problems? I suppose a part # check would be the easiest way to find out.

Richard - I was wondering if the trailing arms splay out a bit due to widened track? The pillow balls also have bit of lateral articulation, so I imagine its not a problem.

With rolled rear fenders, this could be a very interesting and effective handling upgrade. Plus, we can use the sedan alu front control arms which are a ton cheaper than the GC8/wagon one's.

Hmmmmm...time to start checking out the classifieds for sedan folk who want to dump their control arms/lateral links....

Last edited by Arnie; 04-07-2004 at 01:42 PM.
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Old 04-07-2004, 01:58 PM   #12
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Quote:
Originally posted by Arnie
So with the sedan control arms and lateral links pushing everything out, the geometry, combined with sedan struts, should be fine on a wagon.

My only concern would be with the half shafts/CV joints. Are they different between the two cars? Are the sedan's also a bit longer? Most CV joints have quite a bit articulation and "stretching" possiblity, bit I wonder if, long term, there are wear problems? I suppose a part # check would be the easiest way to find out.
Hmm, and I know someone local who just installed the aluminum control arms on his sedan. If he doesn't want his stockers it might be a cheap way for me to get more negative camber up front.

I agree with your concerns about the half shaft cv joint length. I'll have to look into that.
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Old 04-07-2004, 02:03 PM   #13
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I'm curious to see what the handling would be like with the even wider front track. I was looking at the specs and, stock, the front tracks tend to be about 1 cm wider per side than the rear (both sedan and wagon).

Richard - if you get pics up, please try and get a pic up around the rear fender, to give us an idea what sort of clearance issues one might have.
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Old 04-07-2004, 02:08 PM   #14
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Just FYI:

Sedan Front track (wheel center): 1485mm

Sedan Front track (outer edge of wheel): 1730mm

Sedan Rear track (wheel center): 1480mm


Wagon Front track (wheel center): 1465mm

Wagon Front track (outer edge of wheel): 1695mm

Wagon Rear track (wheel center): 1455mm
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Old 04-07-2004, 02:54 PM   #15
Richard Sierra
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I am running Prodrive 17X7.5 GC07C (I think they are +53) with 225/45/17.

The drive axles are shorter for the wagon, however IMO they will be fine with the wider track, the CV's have a lot of lateral movement. I was running the sedan drive axles before I switched to the sedan suspension. Sedan drive axles should be easy to come by if nesc.

The trailing arm part number is the same for the sedan and wagon. (according to Rallispec)

The car is being aligned as I write this, I will report any issues.

I will post some pictures shortly.
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Old 04-07-2004, 03:45 PM   #16
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richard - are your rear fenders rolled? you certainly have the advantage over the rest of us with the nice 53mm offset in your 7.5" width. Most of us seem to be on a 48mmET on 7.5". I might have to pull out a rear strut and see how much room I get at full compression with my rolled fenders.
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Old 04-07-2004, 06:51 PM   #17
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wouldn't it be easier to weld the hatch onto an STi?
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Old 04-07-2004, 08:01 PM   #18
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ding, ding, ding!!! KoneKiller has solved it for us! The holy grail has been found right under our noses. stop the presses...we are saved! halleluja!

We need to do a Monster Garage on that idea.
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Old 04-07-2004, 09:48 PM   #19
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Good thread! I think this one should be a sticky and kept on track. I'm about to do this, just i'll be doing it to a 96 legacy sedan instead of a wrx wagon. I'm pretty sure the track is the same between the older legacies and the wrx wagons. Someone please correct me if i'm wrong!
My one question is this: Are the rear sway bar attachments on the lateral links in the same position between the wagon and the sedan or are they off by the 10mm difference?
And yes, we all do want to see some pics!!!
Brent
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Old 04-07-2004, 10:48 PM   #20
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Hmm, I can take some measurements this weekend to see how the two compare. I'm installing some pink bits on a sedan. I think they might be the same as people put sedan rear sway bars on wagons without issue.
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Old 04-07-2004, 10:52 PM   #21
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the GC8 Aluminum control arms should bolt in without effecting the camber (at least less than the GDA ones). Not sure if anyone wanted to go that route.
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Old 04-07-2004, 11:01 PM   #22
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Hmmmm...just a thought, but you could probably do and entire sedan suspension swap with the sedan aluminum control arms for what a pair of the older ones would cost you.
So, there's some incentive to get this a sticky
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Old 04-07-2004, 11:12 PM   #23
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Quote:
Originally posted by serious
Hmmmm...just a thought, but you could probably do and entire sedan suspension swap with the sedan aluminum control arms for what a pair of the older ones would cost you.
So, there's some incentive to get this a sticky
hehe... yeah that's true, but some people seem to find great deals on JDM parts from time to time. (not me of course... )
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Old 04-07-2004, 11:54 PM   #24
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Yeah, the GC8 alu control arms are stupid $$$, even the used ones that pop up now and then are more expensive than the new sedan ones.

Ideally that would be the way to go, however, so many people are throwing on the sedan strut/spring take-offs on the wagon and having the camber issue. Of course, camber plates/bolts usually solves the problem. This would just be a more complete solution to the camber issue.
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Old 04-08-2004, 02:18 AM   #25
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Here's another solution; get subaru to build the sti in wagon trim. Then you could go down to the squealer and just buy the parts. Like that one will ever happen!
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