K021 Instructions v1.0
Tuning
Page
76
REAR WHEELBASE
The wheelbase of your SCX – 60CF can be adjusted by moving the shims on the inner
or outer rear hinge pins. As the pins are parallel to each other, moving the arm or the
hub carrier by the same amount will have the same effect.
Moving the hub carrier forward increases rear traction in two ways: Primarily you are
adding more ‘angle’ to the driveshaft, so there’s more scrub between the dog bone and
the outdrive as well as in the CVD joint. All this friction locks in the rear end and creates
traction. Moving the hub carrier forward also increases the percentage of weight on the
rear tires, further increasing bite.
Moving the hub carriers back is probably the easiest way to add steering and corner
speed to the SCX – 60CF. It’s one of the most commonly used adjustments for UK
Champion Ellis Stafford. Moving the hub carrier or arm back some will increase
steering throughout the corner. It also makes the truck more stable in bumps, and
because the driveshaft isn’t as bound up, the truck will “pop” better over jumps.
TRANSMISSION HEIGHT
The SCX – 60CF features X Factory’s adjustable-height transmission. While not the
easiest adjustment, it’s a very powerful tuning tool to adapt the truck to different
surfaces. Included in Bag D (step D9) are several sets of transmission shims, four each
of .030” (silver), .060” (gold), and 090” (black). Counting zero, that’s four transmission
height positions. When you change transmission height, make sure to re-check rear
ride-height (remember the race preparation list?). Keeping the ride height the same will
allow you to feel the isolated effect of the transmission height.
Important Note:
For settings above .060”, you’ll want to shim up the motor plate support.
We generally use #4 flat washers for this. Also, as you adjust the transmission height
keep an eye on the driveshafts’ position in the outdrive: there are small shims between
the outer wheel bearing and the wheel spacer which can be moved to the inside,
keeping the CVD engaged in the outdrive at full droop without bottoming out on
compression.
Adjusting the height of the transmission changes several things at once. Primarily, it
sets the distance between the inner hinge pins and outdrives; a greater distance allows
the CVD to exert greater force on the suspension. It also changes the truck’s center of
gravity slightly, as you’re adjusting the height of the motor too.