Are front roll center joints realy neccesary with -3.25 front camber. Just wondering before I spend the cash


Thanks

 

the joints are to add camber but u have enough... if your car is low you might want to add rca's (roll center adjusters ) to help gain back a roll center closer to that of stock

 

The spc joints are 3/4 inch offset in both the vertical and horizontal planes - with 0 additional camber they both give you that much extra room for wider tires and provide that much roll center correction.



You can go +/- 1.5 degrees either way - or you can also rotate them 90 degrees and gain or subtract caster. If you reduce camber as far as possible on the lower offset bolt and add 1.5 degrees back with the spc joint you will be much better off as you are not changing the pivot point at the body of the car by changing the arm height.

 

I see so add more - camber with the spc joint and bring the control arm back in to the center of the car instead of buying the roll center joint.

 

The SPC camber joints DO NOT change the roll centers.

The STR crowd had a long and drawn out debate about whether they retain the stock roll center geometry. The concensus is that they do not alter the roll centers. Though the joints are larger in size, the rotation center location does not change with respect to the spindle.

Here's the image that shows the rotation centers of the stock joint and the SPC joint. Notice the rotation center location in relation to the seating surface where it would mate up with the upper control arm.

STR SPC discussion

EDIT: fixed link

 

Thanks I will read through this.