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Old 03-21-2003, 09:21 AM   #1
Jon [in CT]
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Default STi Suspension Geometry

This somehow ended up in my in-basket and I'm passing it along. It's a specification for USDM 2004 Imprezas. Note how the STi's front swaybar is slightly smaller than the WRX's while the rear swaybar is substantially beefier. You AutoX guys will undoubtedly recognize other important differences.

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Old 03-21-2003, 12:51 PM   #2
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wow look at the castor ...

it should be a turning machine
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Old 03-21-2003, 01:04 PM   #3
somebody else
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Quote:
Originally posted by Jaxx
wow look at the castor ...
Yes! This is one of the points Subaru made in their So. Cal. intro event a couple months ago. It is essentially an "anti-lift kit" as standard equipment. As an aside, it causes the STi wheelbase to measure a centimeter or so longer.

Yes, this is a good car.

--scott
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Old 03-21-2003, 01:53 PM   #4
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That's odd, the wrx sedan and wagon now both have a 17mm rear bar? Didn't the 02-03 sedans have 20mm bars?
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Old 03-21-2003, 02:44 PM   #5
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Quote:
Originally posted by no_rex_yet
That's odd, the wrx sedan and wagon now both have a 17mm rear bar? Didn't the 02-03 sedans have 20mm bars?
If the front is already 20mm.. then I doubt the rear will be also
20mm... usually rear is smaller as a way for manufacturer adding
some understeer to the car...

Glad it is the reverse for the STi...

Jon, is that right?
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Old 03-21-2003, 03:01 PM   #6
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Quote:
Originally posted by no_rex_yet
That's odd, the wrx sedan and wagon now both have a 17mm rear bar? Didn't the 02-03 sedans have 20mm bars?
Yes, according to the manual, the 02 WRX sedan has 20mm stabilizers front and back. It appears for 2004 that the WRX sedan's rear stabilizer has been changed to match the WRX wagon, which remains the same as before, 17mm.
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Old 03-21-2003, 05:26 PM   #7
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17mm? Ouch. Understeer, baby! Now you may just see the oem 20mm rsb go up in value in for sale forum
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Old 03-21-2003, 06:15 PM   #8
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check the rear camber out too!!!

that will help a lot in neutralizing the car
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Old 03-22-2003, 12:58 AM   #9
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The performance suspension kit (STi) for the bug-eye uses a 19mm front bar.

However I believe there is a change to one of the figures you posted.
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Old 03-22-2003, 03:13 AM   #10
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I dont even know why they upsized the front bar on the new cars to 20mm at all... Should have just left them at 19mm like the 93-01's, oh well
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Old 03-23-2003, 04:26 PM   #11
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check out the notes at the end. It says that front + rear toe are adjustable (good) but ONLY front camber is adjustable (not so good).... but the aftermarket should take care of that, via eccentric bolts or camber plates.

just a thought,

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Old 03-23-2003, 08:11 PM   #12
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Quote:
Originally posted by ae82gtm
check out the notes at the end. It says that front + rear toe are adjustable (good) but ONLY front camber is adjustable (not so good).... but the aftermarket should take care of that, via eccentric bolts or camber plates.

just a thought,

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the WRX is the same way...
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Old 03-23-2003, 08:33 PM   #13
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Quote:
[b]17mm? Ouch. Understeer, baby!
if that was the only changed, then yes, but they supposedly also change the strut dampening, so we'll have to see how much body roll it has and how it affects understeer. The '03 Forester revised suspension you notice practically pulling out of the parking lot.. Heck even my wife noticed it.

- Ken
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Old 03-23-2003, 10:46 PM   #14
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Without knowing spring rates it is difficult to guess the effects of any given sway bar combo.
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Old 03-24-2003, 03:15 AM   #15
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Extra Castor on the STi = more direct steering feedback and greater tendency for self-centering = good!
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Old 03-24-2003, 11:06 AM   #16
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um...sorta

Quote:
Extra Castor on the STi = more direct steering feedback and greater tendency for self-centering = good!
more like
Extra Castor on the STi = more direct steering feedback and less tendency for self-centering = twitchy!
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Old 03-24-2003, 12:49 PM   #17
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I wonder how the rear camber values are going to affect wheel/tire choice for those purchasing aftermarket wheels. From what I've experienced, the WRX slightly rubs with +48mm offset wheels with 225 width Kumhos and rear camber at -1.4 (using camber bolts)...I've run less but the rubbing was worse with cornering.

All of this isn't a problem of course with the stock wheels and 225 width tires.

Hmm...just speculation I guess but it would seem to me that wheel and tire choice is going to be tough (unless the fender is changed on the STi...which I doubt).

AnimalMother
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Old 04-02-2003, 02:35 PM   #18
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Quote:
Originally posted by Jaxx
more like
Extra Castor on the STi = more direct steering feedback and less tendency for self-centering = twitchy!
Uh, I think 97itr153 had it right.
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Old 04-02-2003, 02:42 PM   #19
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Can someon please describe "self-centering"??
I've heard it a few times... not sure what it means..
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Old 04-02-2003, 02:55 PM   #20
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Quote:
Originally posted by JT-KGY
Can someon please describe "self-centering"??
I've heard it a few times... not sure what it means..
That's when you let go of the steering wheel and it straightens out if you had it turned. It keeps it straight if you are going straight. Additional castor increases this effect.
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