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Go Back   IWSTI.com: Subaru WRX STI Forums > GD Series STi Discussion (2003/4-2007) > GD-Technical > GD-Suspension, Handling, & Stiffening


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Old 03-13-2007, 06:21 AM   #61
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Todd, definitely let us know what you find. I'm still curious in what they changed in MY07.

Eddie


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Old 03-13-2007, 06:25 PM   #62
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My owner's manual states that it should be 99.4, but I measured about 100.3? I will remeasure it tomorrow as well as my brother's for comparission. He has a 06. Any thoughts?
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Old 03-13-2007, 06:45 PM   #63
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And one more thing. At the top of the page titled Specifications it says "These specifications are subject to change without notice."
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Old 03-14-2007, 05:48 PM   #64
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Remeasured tonight. My wheelbase is 99.4". Now the question still remains if my caster readings were correct.
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Old 03-15-2007, 02:51 PM   #65
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I guess it's time to find another alignment rack.
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Old 03-18-2007, 09:32 AM   #66
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TIC... Did the 07 come and get their alignment? If so what were the caster readings?
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Old 03-23-2007, 11:24 PM   #67
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bump for a reply from TIC... I'm really curious to know what the caster readings were
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Old 03-24-2007, 12:30 AM   #68
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Lots of really good info in this thread…kudos to you people who’ve added to it.
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Old 05-04-2007, 03:52 AM   #69
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Default Re: Alignment, ALK, Caster, Bump Steer and more

I can give you my before and after 07 sti specs:

before: (from the factory)

LF Camber -.1 RF Camber -.2
LF Caster 3.2 RF Caster 3.5
LF Toe .01 RF Toe .04

LR Camber -1.7 RR Camber -1.5
LR Toe .05 RR Toe -.02

The car had slight pulling and terrible directional stability. The front tires outside edges were feathering. The left front worse than the right front.

After alignment:

LF Camber -.5 RF Camber -.5
LF Caster 3.1 RF Caster 3.4
LF Toe -.02 RF Toe -.04

LR Camber -1.7 RR Camber -1.6
LR Toe 0.00 RR Toe 0.00

Also the car had 2 tires out of balance from the factory.

The car no longer pulls and it's directional stability is improved. Handling is improved as well. But I think it could be better.

According to the 06 specs, the caster is way off for an STI. But of course this is an 07. I don't understand why SOA would reduce caster on a car like the STI from MY06 to MY07.

Would the ALK really add .5 to the Caster numbers? Even if it did, it'd be closer to 06, but still not there. What other ways are there to get more caster besides the ALK?
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Old 05-04-2007, 03:09 PM   #70
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Default Re: Alignment, ALK, Caster, Bump Steer and more

I just did a proffessional alignment on the car after my camber plates and coilovers installation. Not sure if this will help anyone but I did find it interesting! What I did was go with the PDE camber plates and I am going to be using a setup for street with 0 toe, and then move the camber out for Auto-X. Here's what we ended up with:

Ride Height: R 13.5" F 14.0" (measured center of wheel hub to edge of fender)

Front:

Street:

Camber: L 1.96 R 1.96
Toe: L 0.00 R 0.01
Castor: L 4.47 R 4.83 (this was setup to compensate for the Crown in the roads)

AutoX/Track: (changes made by moving the camber plates 3 drilled slots)

Camber: L 2.69 R 2.71
Toe: L 0.35 R 0.35 This is toe out btw
Castor: L 4.47 R 4.83


Rear:

Camber: L 1.43 R 1.44
Toe L 0.00 R 0.00

Haven't really tested it out, since after it was done it started raining pretty hard, but the suspension are RCE T2's with Falken Azenis 615 245/45/17.

Looks pretty awesome when the camber is slammed!
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Old 05-04-2007, 04:59 PM   #71
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Default Re: Alignment, ALK, Caster, Bump Steer and more

Quote:
Originally Posted by SmoothSTi
I just did a proffessional alignment on the car after my camber plates and coilovers installation.
What MY car is this?
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Old 05-04-2007, 06:05 PM   #72
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Default Re: Alignment, ALK, Caster, Bump Steer and more

Quote:
Originally Posted by joecool
Would the ALK really add .5 to the Caster numbers? Even if it did, it'd be closer to 06, but still not there. What other ways are there to get more caster besides the ALK?
I don't know how much caster the whiteline Alk adds but my 05 sti had 4.8 L and 5.1 R for caster measurements. The guy was able to get -0.8 degrees camber both front sides. According to his machine my caster was withing spec for a stock STI of 05 MY. I wish I had done an alignment before I installed the whiteline kit.

camber plates like the PDE can be adjusted so as to increase caster as well, so you might want to check into those. The RCE's may be able to do the same, if my memory serves me it's by swapping the right and left sides... or uh.... someone else can chime in on that.
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Old 05-05-2007, 08:42 AM   #73
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Default Re: Alignment, ALK, Caster, Bump Steer and more

Quote:
Originally Posted by DoctorSTi
camber plates like the PDE can be adjusted so as to increase caster as well, so you might want to check into those. The RCE's may be able to do the same, if my memory serves me it's by swapping the right and left sides... or uh.... someone else can chime in on that.
There are two sets of holes for the three studs to use on the PDE plates. One set is for camber adjustment only. The other is for camber and castor at the same time. On the combo setting max camber is reduced.


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