Rear Camber/Toe settings after spring install.

#1

Hey guys/gals, when y’all installed the spec springs/shocks in the rear did anyone have problems with to much rear camber/toe? I have not been able to take it to an alignment shop yet but it appears to be a bit much for the rear, maybe -2degrees camber and around 1/4" toe in, which will increase when loaded .

I have looked at the eccentric RTABs but I am running out of money before the Road Atlanta event in August and need to make decisions about what HAS to be done and what I would like to do.

If the current settings will cause problems with handling or major tire wear, I need to do them. But if others got by for awhile like this then I’ll let it ride. Thanks, Wes

#2

Wes,
I consider adjustable bushings in the rear as essential. I wouldn’t expect your toe to be out of whack with just a spring/shock change, but the eccentrics certainly would fix that. Too much toe-in is going to kill your tires.
Good luck!
-Vic
#325

#3

I’ve been running on stock RTAB’s for the last year and a half with no adverse tire wear. They still wear more on the outside edge.

Vic is right though, for optimal set up eccentrics are a must have. They just can’t seem to move up on my MUST do list.

#4

I ran my first race with the rear out of alignment I also had 1/4 toe in on the right rear. I did get some weird tire wear and the car tended to oversteer, but it was still fun to drive and I had fun racing. So I would say just go for it if you don’t have the money for the adjustable rtab.

#5

What exactly to "eccentrics" do, and how is it legal?

#6

We have 2 cars - 1 with eccentric RTABs and one without. The one with cannot obtain a good rear toe (usually considered no toe in/out) probably because of a bent rear trailing arm. The other has urethane, but non-eccentric RTABs, and the toe in is dead on. It really depends on the the status of the trailing arms as well as the bushings. Vic is right that they add the ability to adjust toe in the rear, but if your arms are not right, then you will still have problems. The regs allow adjustable RTABs.
Ed

#7

So eccentric RTABs adjust ONLY toe-in?

#8

yes, the trailing arm is attached at two "hinges" on the subframe. The eccentric RTABs let you move one forward and one rearward to adjust toe.
cheers,
bruce

#9

As Bruce mentioned, both ends of the "hinge" have eccentric bushings, so each can move slightly in any direction (up/down, back/front, or some combination). So, you can adjust both camber and toe, but often you are trading one for the other. Put another way, once you get the toe that you need, you get to try for the camber that you want.

If you’re a visual person, hold your hands in front of you like you are holding a baseball bat, parallel to the ground. As you move your hands independently up/down, front/back, you see that the angle of the bat relative to the ground and your body is changing. Your hands are the hinge points of the trailing arm.