I have the SPC Light Racing Upper Control arms installed. A the "0" possition these have +2* caster over the stock UCA's and can be adjusted +/- 2* for overall +4* caster over stock or 0* caster over stock (basically in the stock location). Additionally they have 2* camber adjustment.
So my thought process is this: If the stock alignment is ~+2-2.5* caster, I should have at least 6* of caster adjustment with these UCA's. That should be plenty of room to move the tire fwd/out and still have enough adjustment for 3* of + caster.
I explained what I wanted: Move the bottom caster adjustment as far forward and camber as far out as he could (tire forward and out, about 50/50 camber caster if that makes sense). Then use the upper adjustments to make 3* caster and fix the camber.
He claimed to max out the bottom caster (didnt bother with camber) yet had to max out the top + caster (set the upper ball joint to the +4* setting, effectively shifting the tire back so it now rubs if turning to sharp over a bump). I don't understand, the math doesnt work. If the bottom was maxed AND the top, I should have +5-6* caster now...
Anyone help me here? Is he right or is he trying to get a quick 3* alignment?