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#1 |
Scooby Specialist
Member#: 64971
Join Date: Jun 2004
Chapter/Region:
W. Canada
Location: Calgary
Vehicle:BP05 |
![]() I was searching but could not find a definite ansewer.
What are the differences between: 1. USDM Sti Control arms 2. JDM Sti V7 Control arms 3. JDM Sti V8 Control arms 4. JDM Sti Spec-C Control arms Which will give you more caster when installed on a 02 USDM WRX Sedan. Also, is there a difference in the transverse links on them? How to identify the control arms from each other? Markings? Part Numbers? Cutouts etc...
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Last edited by zuczek; 08-24-2005 at 05:06 PM. |
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#2 |
Scooby Specialist
Member#: 64971
Join Date: Jun 2004
Chapter/Region:
W. Canada
Location: Calgary
Vehicle:BP05 |
![]() Bump for answers
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#3 |
Scooby Newbie
Member#: 56232
Join Date: Feb 2004
Chapter/Region:
RMIC
Location: omaha
Vehicle:89 325I i don't know |
![]() bump too.
not to hijack, but what are the tangible differences in performace to those that have them? does it change the way the car feels? |
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#4 |
Scooby Specialist
Member#: 61899
Join Date: May 2004
Chapter/Region:
NWIC
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![]() I know that the control arms are definately less unsprung weight. As we all know unsprung weight adds signifigant value to perfomance both motor and suspension. I have been looking at the Alumininum control arms for a bit now, but am wondering if there is a way to install pillowball mounts in place of the bushings.. and then I'll be adding Moog ball joints to the combo.
As far as differences in versions.. well I have no clue. BIGSKYWRX should chime in and advise us. |
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#5 |
Scooby Specialist
Member#: 64971
Join Date: Jun 2004
Chapter/Region:
W. Canada
Location: Calgary
Vehicle:BP05 |
![]() bump for more info
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#6 |
Scooby Guru
Member#: 70252
Join Date: Sep 2004
Vehicle:05 STI blue |
![]() are there even differences between the aluminium control arms, i thought they were all the same.
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#7 |
Scooby Specialist
Member#: 1094
Join Date: Mar 2000
Chapter/Region:
SCIC
Location: CA
Vehicle:'85 Levin Hatch color of rust |
![]() ver.7-8 wrx sti non-spec c/ra's are just forged aluminum, same design aspects as stamped steel US, non sti imprezas. The ver.8-9 spec c/ra are different design that pushes the strut forward to add more positive castor (similar to adding an anti lift kit). that should be right
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#8 |
Scooby Guru
Member#: 6971
Join Date: May 2001
Chapter/Region:
NWIC
Location: Edmonds, Washington, USA
Vehicle:2008 WRX STi SSM |
![]() The 04 USDM STi has the same caster/wheelbase as the 2003 JDM Spec-C,the standard JDM STi did not share the same specs. The newer crosseyed JDM STi, spec'd like our 05 STi bumped up to those settings so I'm thinking that perhaps they all share the same control arm or they all have some sort of offset control arm pivot mount.
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#9 |
Scooby Specialist
Member#: 64971
Join Date: Jun 2004
Chapter/Region:
W. Canada
Location: Calgary
Vehicle:BP05 |
![]() If you had all of the different mounts laying on a table, how would you be able to tell which one is which?
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#10 |
Scooby Guru
Member#: 7958
Join Date: Jul 2001
Location: Plains of Eastern Montana
Vehicle:09 GH B+ |
![]() v7 are different, v8 USDM/JDM/Spec C are the same. The v8 ones do offer additional caster (~ 1.5 degrees)- how this is accomplished has never been answered very well. I do know the v8 utilize a different rear bushing, as well as utilzing a different cross member. How and if they contribute to the caster change I'm not sure.
I do know there are subtle appearance differences between the GC aluminum arms and the v7's (length and shape of voids)- I'd venture a guess there are subtle appearance differences betwen v7 and v8 as well- unfortunately I've never seen them side by side. Here's a pic of the v7 one ![]() |
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#11 |
Scooby Specialist
Member#: 64971
Join Date: Jun 2004
Chapter/Region:
W. Canada
Location: Calgary
Vehicle:BP05 |
![]() BIGSKYWRX - Is there any markings on the V7 cointrol arms?? Any codes? Paint dots etc?? Is it for sure that the regular JDM V8 Sti (Non-Spec C) will have the extra caster as well when installed on a 02 WRX??
Here is a picture of what I just got and was told it was from a JDM V8 STI. ![]() ![]() Does any one have a DATA SHEET with the wheelbase specifications for a V8 JDM Sti showing the wheelbase of the regular Sti and well as the Spec C?? Last edited by zuczek; 08-25-2005 at 02:36 AM. |
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#12 |
Scooby Guru
Member#: 6971
Join Date: May 2001
Chapter/Region:
NWIC
Location: Edmonds, Washington, USA
Vehicle:2008 WRX STi SSM |
![]() I found a data sheet a couple of years ago but I think the site no longer exists.
Found it ![]() http://www.japanvehicles.com/newcars...X2004/main.htm |
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#13 |
Scooby Guru
Member#: 1134
Join Date: Mar 2000
Chapter/Region:
MAIC
Location: Mechanicsburg, PA
Vehicle:2015 Outback H-6 White |
![]() All I know is that they're much stiffer, structurally, than OE. So much so that a lot of rally drivers don't actually want them... They're so stiff, that impact doesn't collapse the control arm, it bends at the frame instead.
Subie Gal I think has the same issue... I'm sure they have tremendous benefits, but for a low or moderate racing budget, maybe not a good idea? At least from what I've read. Don't shoot the messenger. ![]() =S2= |
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#14 |
Scooby Guru
Member#: 7958
Join Date: Jul 2001
Location: Plains of Eastern Montana
Vehicle:09 GH B+ |
![]() If you look carefully the one you have pictured looks different (unles it's flipped over- take a pic from the other side as well if you could)- which would lend credibility that it is indeed a v8 one.
The aluminum ones are indeed stiffer, that's the primary reason they use them (it's like a large bushing in effect- les deflection w/ the aluminum)- the weight difference is very neglible- the al arms are only 3/4 lb lighter/side. You do run a possible risk in a front end accident to do more damage to the suspension as the aluminum one won't crumple as readily as the steel one. Also remember that the rest of the world has been running these aluminum arms as oe on all WRX's and STi's for several years. North America is the only market I'm aware of that doesn't get these arms- and that may possibly change w/ the 06 (rumor ![]() |
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#15 |
Scooby Specialist
Member#: 64971
Join Date: Jun 2004
Chapter/Region:
W. Canada
Location: Calgary
Vehicle:BP05 |
![]() Couple more pics. I think it looks the same except maybe this area.
![]() ![]() Does anyone have a picture of the USDM Sti or Spec C Control arm?? |
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#16 | |
Scooby Specialist
Member#: 64971
Join Date: Jun 2004
Chapter/Region:
W. Canada
Location: Calgary
Vehicle:BP05 |
![]() Well, I guess it clearly shows here that in a JDM 2005 ONLY the Spec-C has the 2540mm wheelbase and everyone else gets the 2525mm. So I guess it means that the V7 and V8 control arms (Non Spec-C) are the same dimensions.
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#17 | |
Scooby Specialist
Member#: 1094
Join Date: Mar 2000
Chapter/Region:
SCIC
Location: CA
Vehicle:'85 Levin Hatch color of rust |
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#18 |
Scooby Newbie
Member#: 19396
Join Date: May 2002
Location: BAY AREA, CA
Vehicle:02/6 FrankensteinWRX black |
![]() here is the control arm from a ver 8 spec c control arm
![]() image from rallispec |
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#19 | ||
Scooby Guru
Member#: 21808
Join Date: Jul 2002
Chapter/Region:
E. Canada
Location: National Capital Region
Vehicle:02 GroceryGettAr Nonemore Black |
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#20 |
Scooby Specialist
Member#: 64971
Join Date: Jun 2004
Chapter/Region:
W. Canada
Location: Calgary
Vehicle:BP05 |
![]() Someone must have a USDM control arm to take picture of.
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#21 |
Scooby Guru
Member#: 7958
Join Date: Jul 2001
Location: Plains of Eastern Montana
Vehicle:09 GH B+ |
![]() I see a couple of differences in the pic- look at where the sway link attaches the v7 has a little bit that protrudes into the arm- yours doesn't. Also look where the rear bushing mounts- yours shows a small void where there is none in the v7 one.
All of the v8 STi's receive the additional caster. Would be nice to see a pic of a "confirmed" USDM one |
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#22 |
Scooby Specialist
Member#: 1094
Join Date: Mar 2000
Chapter/Region:
SCIC
Location: CA
Vehicle:'85 Levin Hatch color of rust |
![]() hmm, looks to be one complete piece w/ tranverse link. i'll take a look at my friends 05 sti and see if its the same.
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#23 |
Scooby Guru
Member#: 11482
Join Date: Oct 2001
Chapter/Region:
South East
Location: Winston-Salem, NC
Vehicle:02 WRX Acute Stickeritis |
![]() I've held the V7 control arms and the stock stamped-steel control arms in my hands and on a scale; they're within a pound of each other.
The biggest benefit comes from the siffter transverse link bushing on the V7 control arms which is why folks say it feels so different after changing them. Personally I'd buy the Group N transverse link bushing and go with that rather than pay the expense and go through the hassle of swapping the whole control arm. Not to mention that they are a bit stiffer and thus rally drivers don't tend to use them as they don't have a built-in failure point. While reducing unsprung weight is never a bad thing it's honestly not significant in most cases of a street car and unless the car is relegated to racing-only duty I would basically never give them another thought. The biggest percentage of gain is in the bushings; the stamped steel is quite strong on it's own. ![]() -Biggly |
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#24 |
Scooby Specialist
Member#: 5673
Join Date: Apr 2001
Chapter/Region:
BAIC
Location: Folsom, CA
Vehicle:05 LGT, 02 bug eye 16 Hellcat, 19 CTR |
![]() Can someone provide the part numbers of the various AL control arms?
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#25 |
Scooby Newbie
Member#: 73742
Join Date: Nov 2004
Chapter/Region:
TXIC
Location: Somewhere near Austin
Vehicle:03 WRX PSM Sedan |
![]() A quick question here. Are the suspension pick up points all the same on all MY's of USDM WRX's? Meaning, would I be able to put V8's on an '02 or '03?
luggnutz |
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