in august i installed techno toy tuning rear lower control arms, removing my arizona z car lca's. prior to heading to the alignment shop i had [what i thought] was a good idea. as my upper strut towers are slotted, i moved my struts outboard and, when they dialed in the neg camber i requested i could still add neg camber when at the track if needed by simply moving the struts inboard via my slotted towers.
main reason for purchase of the ttt lca's was complete on car adjustability. from the limited driving i did they seemed to work great. the shop that does my alignments performs mainly track prep for bimmers and p-cars, some are track only. the guy that does the work is a long time race crew chief and commented on how much he liked the lca's for both their construction and ease of adjustability.
my idea to allow trackside camber adjustment is/was flawed.
driving around town and over 100 miles before i hit the track, including a few glorious burnouts i experienced zero problems.
2nd lap at watkins glen, car is warm and i step into it coming through the esses that lead to the back straight. pop, grind, grind then both speedo and tach rise but i'm not going faster. great, i'm thinking i just blew the q45 diff, 1st session of a 3 day event.
limp back to the garage bay and disover the diff is fine but left axle is suspect. i pull the axle and find the cv balls in the boot.
pull the axle apart and find the carrier for the balls is fractured [later breaks] and i figure it's fatigue and source another from a local jy. that night get it fixed, 1st lap 2nd day, pop-same thing but the other side.
fix the right axle, think it happened due to my brainchild idea for camber adjustment which actually widened the track. so, to fix it and be able to drive home i pull the upper struts inboard fully then pull inboard the lca's as well [nearly zero camber now but driveable].
this time the inner retaining ring got bent and nearly gave way. both times it seems as thought the axle was extended too far.
fast forward, today i [finally] get the axles out and pull apart the left side. check it all over, looks ok. measure both compressed and extended lengths. i get ~13.25" comp, 16.1 ext. then i remove the spring from my coilover to run the suspension thru it's travel. ~13.5" from full droop to full comp.
questions to the braintrustees here.
does my rationale for failure seem accurate?
anyone know the servicable lengths for the q45 mod axles [mine are from modern motorsports]?
ideas?
pic of my damage. clockwise, broken cage and damaged spyder as well as dinged balls [ouch], damaged end cup, good end cup, good retainer ring, bent ring.