yessamgerg

Any idea how far in the stoptech rotor is compared to OEM? My understanding is that the inboard face is basically in the same spot and the extra thickness goes outboard but I could be misinformed. I know they want to maximize wheel clearance so they might shift it in a bit to help with that. Sounds like it would be pretty darn close to touching even without the spacer in there once you factor in the compliance of the knuckle and hubs.

yessamgerg

The next question is then of course what is the best fix? If it were me I would certainly be replacing that arm (will it fail? I'm all but certain it will be fine but why risk it, a $200 arm now is a lot cheaper than an entire car if it fails). The question is how do you stop it from happening again. How sold on the RCA adjuster are you? Depending on your usage (TT points/autocross rules) can you add an offset balljoint to the mix as that would gain you ~1/4" of clearance. Alternatively you could get some ~3mm spacers and run them between the rotor and hub to shim the rotor out, then find some 3mm fender washers to space the caliper out the same distance?

afzan

Strange. Me and about 5-6 locals here are running stoptech bbk with Megan/hardrace offset ball joints with the rca spacers and no issues

yessamgerg

key word is offset. OP is running the hardrace RCA but without the offset balljoints. His friend appears to be running the non-offset just RCA hardrace ball joint. Because the ball joint mount is angled towards the rotor, running just the RCA spacer move the CA towards the rotor enough to contact. If you run the offset balljoint and the RCA then the offset balljoint more than cancels the RCA's effect.

SlowTeg

Interesting thread.. The stoptech rotor obviously sits a lot closer to the lower control arm than the OEM rotor, and perhaps with the RCA spacer it makes it a little worse. I'm running the megan offset lower ball joint w/ the RCA spacer, but the offset balljoint will obviously push the hub farther away from the lower control arm and give the rotor to control arm a little more clearance. Next time I have the car on jackstands I'll have to look at the clearance for comparison's sake.

In terms of a solution.. I'd say the no brainer "fix" is either removing the RCA spacer or running an offset balljoint. Can you hear the rotor making contact with the LCA OP?

Sylvain2000

No i did not ear it.

My guess is that it only hapened when hiting a big curb.

I just ordered the buddy club front lower ball joint and SPC top ones. My car as 100k miles on it. I guess the top ball joint is geting weak and gives more play then it should.

I did notice a good diference with the RCA. I have them on the rear also. So i would like to keep the front one the be even.

I still have a pair of oem Disc i Will mesure the diference but i took the knuckle out yesterday to have my new bearing pressed in this week.

I Will post the result when it is done.

Keep up your comments

manystyles

Hello,

Wondering if you ever resolved this? Wonder if this is a Megan RCA specific issue or RCA's in general.

Cheers,
Alex