Toe-in measurements

turbofreek said

positive caster added by qa1 upper control arms. do they have add cast in them?
i have the qa1 non adjustable uppers and custom heim end lowers with coiloverz. i need to adjust caster and camber before i do toe adjustments on the rack n pinion. any pointers?
my dr side is damn nesr perfect but pass side wheel cambers pretty hard. never done an alignment but willing to do it. 1500+rwhp car fwiw

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Yes, the QA1 upper control arms have additional caster built in compared to the factory control arms.

Your suspension sounds decidedly custom though, so what you get out of all that I don’t know. Normally you use the eccentric bolts that hold the UCA’s on to adjust caster and camber. A rough setting is usually setting the adjustment so that the front arm of the UCA is as long as possible, while the rear arm is made as short as possible. That maximizes positive caster.

Hopefully you aren’t using the stock spindles with the steering arms turned forward for your rack and pinion. Otherwise you’ll have Ackerman and other geometry issues.