These adjustable camber arms are necessary to bring rear camber back into spec after lowering because lowering significantly increases negative camber, causing excessive tire wear. They also allow up to 3 degrees of negative camber for auto-x and road racing. These adjustable camber arms fit both the Gen1 and Gen2 model Mazdaspeed3s.
This install is straight-forward, but can be difficult without the right equipment.
IMPORTANT: THE CAMBER ARMS ARE NOT IDENTICAL. THE ADJUSTING END FOR EACH ARM SHOULD BE LOCATED AT THE WHEEL OF THE VEHICLE, AND THE JBR LOGO SHOULD BE READABLE FROM THE REAR OF THE CAR.
NUMBERS IN PARENTHESIS FOUND IN THE FOLLOWING INSTRUCTIONS ARE TORQUE NUMBERS TO BE USED WHEN RE-INSTALLING. THE FIRST RANGE OF NUMBERS ARE MEASURED IN NEWTON METERS. THE SECOND RANGE OF NUMBERS IS MEASURED IN POUND FEET.
1. Remove the 17mm bolt connecting the stock rear upper arm to the wheel and brake assembly (76-102n*m, 57-75lb*ft).
2. Remove the 17mm bolt connecting the stock rear upper arm to the frame (76-102n*m, 57-75lb*ft). Removing the bolt can be difficult. A long 17mm open or box ended wrench will be helpful. There is not enough room to fit a ratchet. Once the bolt is out you can remove the arm from the vehicle.
3. Lay the stock arm on the ground and lay the corresponding adjustable arm on top of it. To make sure they are lined up correctly use the two bolts you removed from the vehicle and thread them through both arms. Once the adjustable arm is lined up with the stock arm tighten the jamb nut to lock it in place.
4. Installation is the reverse of removal. If you have trouble installing the new arm due to tight clearances I suggest using moly grease and a soft mallet to slide the arm into place.