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Old 01-15-2003, 01:38 PM   #1
somebody else
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Thumbs up Suspension Geometry = anti-lift

One thing I haven't heard mentioned here is the change in suspension geometry. At the west coast introduction at the Peterson Automotive Museum January 11, they made a big deal about it and I believe them.

The wheel base has been stretched by about 15mm. The added length is a result of increasing the front caster. This is, essentially, a factory-installed anti-lift kit. This was touted as improving turn-in and general responsiveness.

It can thus be implied that an anti-lift kit is a cool thing to do to existing WRXen, n'est pas?

Anyway... cool!

--scott
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Old 01-15-2003, 05:04 PM   #2
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Quote:
Originally posted by somebody else
The wheel base has been stretched by about 15mm. The added length is a result of increasing the front caster. This is, essentially, a factory-installed anti-lift kit. This was touted as improving turn-in and general responsiveness.
If what you say is true, we got a big part of the STI Spec C's suspension geometry. The Spec C's control arms are different from the regular J-spec's STi. The arms are responsible for the 15mm increase in wheel track.

All in all, this means the STi's handling is fairly neutral and isn't as plow happy at the limit as most GDAs and GDBs. W00t!
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Old 01-15-2003, 09:46 PM   #3
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Yes, this has been mentioned several times that we're getting the Spec C geometry.... to which I say "woohoo"

Just the rear pivot bushed on the JDM control arms are way better than the current WRX so with the Spec C geometry I believe Paul mentioned "better turn in" as a tangible benefit.

There are also elements of the front suspension tuning that we are getting that are slightly better than JDM and will be rolled back into the JDM STi perhaps as a running change.
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Old 01-15-2003, 11:59 PM   #4
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very good news.
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Old 01-16-2003, 03:46 AM   #5
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Quote:
Originally posted by Glenn Wallace
There are also elements of the front suspension tuning that we are getting that are slightly better than JDM and will be rolled back into the JDM STi perhaps as a running change.
what elements are those?
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Old 01-16-2003, 05:07 AM   #6
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i was wondering about this myself... and started looking into ALK's for my WRX

however, there are other ways to increase castor besides adding distance at the place where the ALK goes. Does anyone know the place where the Spec C and the USDM STi adds this 15 mm?
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Old 01-16-2003, 05:13 AM   #7
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Quote:
Originally posted by Impreza01

The Spec C's control arms are different from the regular J-spec's STi. The arms are responsible for the 15mm increase in wheel track.
and you mean wheelbase, not track, right? Unless the track is also wider (possible, but never heard of it).

I wonder what changed would be needed to use the Spec C's control arms... Could the stock strut tops handle that angle change, etc.
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Old 01-16-2003, 10:23 AM   #8
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Hmm... So Somebody Else lives next door to me, huh? And his name is the same as my middle name? I'm starting to wonder if I'm schizophrenic now!

--Ryan (aka: Vipre)
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Old 01-16-2003, 12:00 PM   #9
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The more I think about the Spec C control arms the more I think that is the only change in order to get that geometry --- certainly everything has enough length etc to move that much forward.

Now, I am not sure if there are any differences to the front sway bar mounting compared to the GDA, so whether they fit a bug eye I am not sure of.

Glenn
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Old 01-16-2003, 05:36 PM   #10
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Very interesting, thanks, Glen....

Hmm.. I just remember the stock top mounts being pretty set at one angle. Granted, the rubber mount is soft, so flex is okay, but it would be forced permanently into an angle that it wasn't designed for. maybe we'll need pillowball mounts to go with USDM STi arms, if that part turns out to produce the extra castor.

In the meantime, i'm going to go check out my front suspension
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