this thread documents my experience with studio's camber roll center adjusters aka RCAs. i will not go into much detail on what RCAs do in general, let alone camber RCAs. the following will show my results during installation, driving impressions, etc.
unfortunately studio only made camber RCAs for 95-00 LS models. these are the studio RCA kit version 2.1. from what ian, the owner of studio, told me, the previous versions had more offset by about 0.25in which meant more camber. they were also left in a raw state rather than deburred as shown below.
i decided to replace my lower ball joints with OEM while i was already there. my old ones had no play but i took precaution.
the RCA kit came with hardware:
- 4 bolts (12x50mm 1.25 pitch 8.8 grade hex head) to bolt the RCA to the ball joints
- 4 flat washers
- 4 bolts (12x50mm 1.25 pitch 12.9 grade allen head) to bolt the knuckle to the RCA
- 4 flat washers
with all the recent failures of bolts breaking and shearing off on other memeber's RCAs (also from studio) i took more precaution and replaced the 8.8 grade hex bolts with 12.9 grade allen bolts.
this was taken from another thread regarding my going with 12.9 grade. for now i have not changed my choice but am open for further discussion. this is very relevant information and worth the reiteration.
Originally Posted by chrispy
Everyone having trouble with the RCAs should read this thread.
There's a lot of stress on those bolts especially when they're offset and cambered. Although a high grade bolt like a 12.9 is strong, it is brittle as well. OEM suspension uses grade 8.8 or 10.9 because it is relatively flexible but strong at the same time.
I would only torque it maybe 10 ft/lbs past the stock torque spec max. They are just like your wheel studs. Too much torque and they will snap. Use some medium thread lock and retorque after 50 miles or so. Hope this doesn't happen to anyone else.
here is the RCA half way bolted up to the ball joint using the replaced hardware.
you can see the amount of offset the holes are in, which repositions the knuckle outward for more negative camber.
all bolted down, the RCA is 35mm tall. i torqued everything to 83ft-lbs evenly which is the factory spec.
from the above picture note by the RED arrow the bolt coming from the RCA then through the knuckle protruding upwards. on the other side of the knuckle, there is no exit hole for the bolt to protrude. the 50mm long bolt is probably 5mm too long so i will either need to cut the tip off the bolt or buy a shorter one. ian warned me that this may happen as some knuckles are threaded deeper than others. i have yet to fix this!
with the wheels on, the RCAs not only added camber, they pushed my wheels out by probably 10mm or so!
it's hard to see but from the height shown the camber is almost the same as the rear now. i want to get it all to tuck, but the tires are stopping me.
time to get smaller tires (currently 225/35/19), and/or do some fender pulling.
for comparison this is w/o the RCAs.
i have yet to do a test drive. the fact that the bolt is too long and probably did not tightened properly is currently stopping me from driving. when i was repositioning the car on the driveway, i got a few metallic creaks and squeaks
! more to come soon.