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Old 03-08-2005, 06:06 PM   #1
imprexxa
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Default front lower control arm options for gc8

i searched and searched but i dont think i want to spend 1000 dollars on aluminum contorl arms for my 1997 impreza sedan. i havent bought suspension yet so i'm not tied down by what i already have on my car.

what all do i have to do to make the wrx ones work?

i have a 2003 wrx engine.

would i use wrx sedan axles and front suspension?

or is this impossible and should i spend the 1000

thank you all
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Old 03-08-2005, 06:38 PM   #2
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It is very possible, in fact it is what I will be doing. You need to use the front cross member from a GD turbo. It will bolt in no problems. Then use the aluminum control arms from a WRX. It will increase the track width but that will improove the handling. You might have to role the fenders a bit though. Here is some links that might help you out.

http://www.simon.tunertek.com/Underside.jpg
http://www.simon.tunertek.com/frontsus.jpg
http://www.simon.tunertek.com/rear.JPG
http://www.simon.tunertek.com/rearsus.jpg

Those are pics from Simon Lines' car. Simon works for Prodrive UK And realy knows what he is doing. It is a 92 JDM Impreza with Ver. 8 STi motor, Tranny, and Sus.

http://www.subaruwrxparts.com/04sti-suspension.html

Look down the page, you will see the links for 350.
PM me if you need any more help.
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Old 03-08-2005, 06:46 PM   #3
RokketRide
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I bought a set of used GC arms for under $290 shipped.

The deals are out there.
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Old 03-08-2005, 07:19 PM   #4
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Quote:
Originally Posted by RokketRide
I bought a set of used GC arms for under $290 shipped.

The deals are out there.
They're out there but rare.

I think gr8wheels may still have a set or two from their GC imprezas they brought over last month (or more on the STIs coming over soon).
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Old 03-08-2005, 07:31 PM   #5
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Yeah, I got extremely lucky. Some San Jose area shop put 2 very nice complete sets on ebay with a buy it now price of $275.

This was only a few months ago.
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Old 03-08-2005, 07:34 PM   #6
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Quote:
Originally Posted by Wayne_Coots
Those are pics from Simon Lines' car. Simon works for Prodrive UK And realy knows what he is doing. It is a 92 JDM Impreza with Ver. 8 STi motor, Tranny, and Sus.
I thought that url looked familiar. And ya, he knows a lil bit about scoobies!
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Old 03-08-2005, 08:29 PM   #7
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hum... i wonder if a crossmember replacement would warrent keeping it under 1000 dollars.

i saw as et on ebay go for about 340 dollars (gc aluminums) i was outbid by 20 dollars.

say, what are the caster differences between the gd sti aluminum and gc sti aluminum arms.

i wonder if the newer sti would give you a better static positive caster than the gc.

how much does a cross member go for?

and what axles do you use? stockers (for the sedan or wagon)?

i have 2.5rs axles on my swap right now....
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Old 03-08-2005, 09:51 PM   #8
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yeah the extra static caster in the latest STi control arms is something to consider. they should give around a degree extra caster, perhaps more over the GC8. Longer axles would be the safer way to go but several wagon folk have thrown sedan alu control arms and have had, so far, no ill effects. but who know if they will last 80000 miles. the extra track of the WRX setup would be very nice to have. You wouldn't necessarily need to use the WRX sedan struts. you could use the GC8 struts and they would give around an extra degree of negative camber on the sedan control arms.
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Old 03-08-2005, 11:50 PM   #9
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wait, so i could effectively use wrx control arms, and dial in some positive camber to negate any extreme negatives?

(ironically i'm having issues with my camber up fron, it only goes to -.9 degrees max, i was thinking of getting noltec camber/caster plates to correct that.

what ill effects would one experience? strut fetigue? you'd think tie rods would have to be lengthened....
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Old 03-09-2005, 12:11 AM   #10
imprexxa
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Thanks for the information.


Are there any difference between the "spt lower" control arm and the sti lower control arms?
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Old 03-09-2005, 12:40 AM   #11
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^ they look to be the same unit... but i wonder if theres a difference in caster again. in any case it beats the hell out of the price of gc8 lower control arms
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Old 03-09-2005, 02:09 AM   #12
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There shouldn't be any strut fatigue. Just make sure you have longer axles. the tie rods have enough adjustability to compensate for the extra cm or two difference. yeah, you would dial in less negative or more postive camber to get to "normal' specs. As mentioned above you may need a different crossmember. I'm not sure about that detail.

As far as the difference between the SPT and STi control arms. Definitely look at part numbers for STi control arms and compare. I suspect the SPT control arms are the older, pre-additional caster alu arms from the V7 STi. To be on the safe side get control arms from the USDM STi. They share the same geometry as the latest Spec C. Then throw on an ALK and you will be rocking!
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Old 03-09-2005, 07:35 AM   #13
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:\

i have a psrs but i font know if i want to do this if in fact i do have to replace my cross member....

i dunno, i guess i'll research more
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Old 03-09-2005, 04:28 PM   #14
imprexxa
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How much does a new Crossmember go for? I think i am using the Turbo Legacy crossmember. Is that not compatible?
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Old 03-09-2005, 05:33 PM   #15
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Quote:
Originally Posted by akyona
ok. look this stuff and answer ===> www.__s_controle_arm_options_posi.ll.asti.com
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Old 03-09-2005, 05:47 PM   #16
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Give him a break, his join date was yesterday.
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Old 03-09-2005, 10:49 PM   #17
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Yes the v7 GDB arms are cheaper, shame but true. Cross member will run you ~ $200 new. The v8 GDB arms are pretty expensive (~ $600 pair- new)- the only way you'll see them used is on a wrecked STi (there have been a few of these of late)- you'll also want to insure you get the STi crossmember- same price as the WRX one (different part #).

If I was going to go to the wider track I'd spring for the axles as well. Don't forget the lateral links in the rear will need swapped as well- to increase track there as well.

I found a real good deal on my GC ones

Big Sky
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Old 03-10-2005, 07:31 AM   #18
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I have searched around and it seems that all the GD arms are the same and that the differances in geometry come from the cross member that is used. The front bushing on the controle arm is what forces the switch to the GD cross member. The new for 05 STi should give you the best handling results, or you can get a used one from anyone that imports the newer front clips for less shiped than a new one, just be sure to ask for the newer style with the three extra braces that eliminate the subframes.The best prices I could find are 350 for the arms new, 250 for the cross member new, and 900+ for the GC arms new. Yes Gr8wheels does have good deals on these arms 495 a set used I belive.
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Old 03-10-2005, 08:34 AM   #19
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gr8wheels doesnt ahve them anymore

although... i just bought lateral links for my car -_-'

i guess i will have to save up for gc ones or lurk for a deal. i dont want to mess up handling too much, having wider track width in the front, and stock in the rear
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Old 03-10-2005, 09:48 AM   #20
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You can make the bushing on a GD one fit the GC crossmember in about 30 seconds with a grinder. The metal insert part of the bushing is just a tiny bit wider on each side. Alternatively you could press in a bushing from a GC control arm into the same spot and it would fit.

I'm going to do a bunch of measurements tonight because I have pretty much every iteration of parts above including a GD and GC crossmember. I put a GC8 front axle up against a 6MT front axle and they were the same length, but there may be inner parts of the axle that are longer to compensate for the width difference. I'll do various measurements on the crossmember spacing between mounts, the different parts of the control arms, etc.

The track difference between the 05 STI and the GC8 is .8" up front, .6" from the WRX sedan.
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Old 03-10-2005, 10:12 AM   #21
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As a side note you can get the GC arms to fit the wagon cross member w/ correctly selected hardened washers or press in a GG/GD one. I elected to go w/ washers, I was leary of someone pressing in/out metal bushings in my "priceless" arms

dwx- looking forward to seeing what dimensions you come up w/
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Old 03-10-2005, 11:26 AM   #22
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8 inch wide wheels will increase the track width. Having the front wider than the rear will reduce understeer. If you are concerned about the rear lateral links here is an option for you.

http://forums.nasioc.com/forums/show...5&page=1&pp=25
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Old 03-10-2005, 07:27 PM   #23
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ok...so if i got the wrx control arms, will i be able to bolt it up and just try to dial in some positive camber to negate the increased negative camber....

would i have to worry about tires hitting my fender?

also, i'm not ~too~ worried about oversteer, i can adjust driving and lighten my sway bar.

if the wrx one does work... i might try it. i know a buddy who can get axles for cheap...
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Old 03-10-2005, 08:18 PM   #24
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Yes you can add camber to level out your tires. You might have some fender issues, but it shouldn't be that bad unless you have realy lowered your car. I think you might have misunderstood me earlier. If you increase the front track width you decrease understeer and greatly improove turn in responce. Any increase in track width will improove the overall handling ability of the car. To many people reliey on sway bar size and adjusments. If you have the option keep a 19-20 mm front sway bar, anything more decreases the ability of your car to remain under controle at the limit and lowers that limit as well. And the same goes for the rear 19-21 mm, no more. Choose your spring rates wisely because they will make some of the biggest changes in your cars ability if dampened properly. Again don't go to stiff with the springs. The links I posted earlier of Simon Lines' car is a good example of a very nice streetable setup. Factory STi Ver.8 Sway bars and Sus. arms and links, P1 springs with ohlins stuts. You can improove upon that with the ohlins coil overs with properly selected springs.

Sorry there, I went of on a tangent. Or as we say in the contry, I was chassin squirles.

But any way, Someone mentioned replacing the front bushing as an option. I don't see any problem with that, as a matter of fact I was cosidering getting a spherical bearing pressed in once I get my set.
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Old 03-10-2005, 11:37 PM   #25
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well, i am interested in the wider track width, i just dont want my tires to be sliced by my fender.

i'm only maybe an inch lowered. lowering the car too much can negatively effect the cars roll center with light spring rates.... although i have to complain, my prodrive springs are a little too light for my taste... but i also rally cross so i cant have anything too stiff either. the constant battle of what i want to do wiht my car..


in any case, will the arms bolt up to the older legacy turbo crossmember (which is what i am using as well iirc)...

i was planing on getting the noltec camber/caster plates anyways so i doubt camber would be an issue to straiten out...

i currently have a 21mm cusco sway set on its middle setting. i may go back to its softest setting shold i do this mod.

where to get a bearing replacement (with a spacer to keep it from walking) for the lower control arm? i think poltec was going to look into it....
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