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Old 01-11-2017, 09:05 AM   #1
Steurgon
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Member#: 452806
Join Date: Aug 2016
Default Suspension upgrade "recipe"

Hi all. I am new to subarus and trying to figure out what is common recipe to improve the handling on these cars. I just picked up an 05 sti. I've read a lot of the FAQ stickies and feel I'm on the right track, just want to get some opinions. This car will be driven on the street but I'm also focused on trackdays and canyon fun with occasional autocross ( don't care about classing though) so far I have bought:
15 sti rack and pinion
RCE yellows
Whiteline ComC tophats
SuperPro adjustable swaybars 22f/24r
Whiteline adjustable end links
And front and rear strut braces.

I know the rear end is notorious for clunking, what bushings are needed to solve this or is it better to get group n engine and trans mounts?

And for control arm bushings, do the offset bushings do the same as an alk or does the new shell on an alk have something to domwith the geometry change as well? And what's the "free caster mod"

Any tips on alignment specs? A proper alignment is to suspension what a good tune is to an engine.
I plan on running extreme contact DWs 235/45/17 on stock wheels.

Thanks for the input and suggestions.
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Last edited by Steurgon; 01-11-2017 at 09:50 AM.
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Old 01-11-2017, 01:25 PM   #2
jamal
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Location: Montana
Default

Rear clunking often comes from the struts. They are inverted and the insert can stick on the housing.

While you are doing the springs you can take them apart (undo the nut on the bottom- be careful and push down hard while you are doing it or it can spin and strip out the keyway that holds it in place), clean out the bushings, and add new grease.

The ALK is a complete housing for the rear control arm bushing. Easier to swap and offers some benefits over just a replacement bushing, even the offset ones. It moves the pivot point out to add caster and down to remove anti-geometry, and is much stiffer than stock. Works very well.

The most negative camber you can get on that setup up front will be something like -2 and that is a good place to start. The rear will end up around there or at like -1.5. It's not adjustable but you probably don't need anything.
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Old 01-12-2017, 10:49 PM   #3
Web Foot STi
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Join Date: Jun 2003
Chapter/Region: NWIC
Location: Portland, OR
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2004 STi
White

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Quote:
Originally Posted by jamal View Post
Rear clunking often comes from the struts. They are inverted and the insert can stick on the housing.

...
Yep, a golf ball size gob of waterproof grease slathered on each of the rear strut shafts works wonders. Personally, I use Valvoline.

The STi is a fun car to drive.
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Old 01-13-2017, 12:31 PM   #4
Steurgon
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Thanks for the tip.

Is a roll center kit nessasary when lowered on rce yellows? Dropped is .9F/.8R
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Old 01-16-2017, 02:56 PM   #5
eckman
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Struts bars do not add a great deal of benefit for the money. I would skip those two parts and install TIC's X-Brace and fender cowl braces. I would call TIC and do what they say with your budget.
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