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Originally Posted by Hostile_Kittens
So I bought Tarmac 2's with the Whiteline value-pak a while a go and it came with the KCA326 rear upper camber adjustment bushings. I'm looking to install them soon and wanted some advice.
I've got adjustable lower control and toe arms already an have been running around -2.5 in the back.
Should I put neutral camber on the uppers and then adjust the bottoms as required to keep the -2.5? Would neutral be the 12 or 6 o'clock position?
Should I put max positive camber on the upper and adjust the bottoms out to maintain -2.5 for a slightly wider track? Would that screw up my hub bearings?
I've got the STi trailing arms, which aren't adjustable, will these screw up the caster angle?
I haven't really found any threads or anything about these, I'm assuming because they're a tremendous pain in the ass to install. Luckily I've access to a full shop on base w/ a press and an alignment rack I can use.
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Neat trick from MotoIQ on those bushings:
http://www.motoiq.com/MagazineArticl...Whiteline.aspx
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You can see how the Whiteline upper control arm eccentric bushing allows adjustability. We set the bushings to reduce negative camber and also to raise the upper control arm inner pivot as high as possible to raise the rear roll center. When the car is lowered the rear roll center drops. Too low of a roll center can make the car twitchy at the limit. When you correct the front roll center like we did in the last installment of Project -FR-S the roll axis starts to get flatter. We feel that the roll axis needs to slope forward for the most natural feel to the car. By raising the rear roll center we can maintain this relationship.
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I would do this if you have both the rear camber bushings and rear adjustable LCAs. Don't worry about your STI trailing arms.
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We also got some of the tilt out of the upper control arm to reduce anti squat which will help corner exit traction some.
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As in they have the front bushing adjusted slightly differently then the rear. Not 100% necessary, but a neat trick.
- Andrew