K021 Instructions v1.0
Tuning
Page
75
slippers is the ease of adjustment: have a friend take a ¼” wrench out to the track, and
a few brief pit stops later you can have the truck completely dialed.
Adjusting the differential for track performance is a tougher science, especially since the
adjustment window is pretty small – less than full turn on the diff screw can go from too
loose to locked up. The idea is, the looser your diff is, the more corner speed the truck
will carry. A tighter diff will have more forward bite – similar to running a locked diff in a
drag car. Diff adjustment isn’t changed often but can be useful; always be sure the
slipper gives before the differential barks.
FRONT CASTER
We suggest you begin with 30
o
caster blocks (ASC #9593). These give the truck great
corner entry steering while keeping it stable on exit. There are also 25
o
and 20
o
blocks
available (ASC #9580 and #9592, respectively), which will progressively take away from
turn in while adding exit steering. Honestly, the X Team worldwide runs the 30
o
blocks
almost exclusively; there are usually better ways to gain steering without losing stability.
ANTI-SQUAT
Rear anti-squat is the angle of the rear hinge pins relative to the ground. Lowering the
rear toe-in block by removing spacers increases the amount of anti-squat in the truck.
With no spacers, the truck has 4
o
of anti-squat; with approximately .120” (3 mm) of
spacing the truck has 0
o
, so every .030” (.74 mm) of spacers is a degree less. The thin
white nylon shims included in the kit are .030”; the thicker ones are .060”.
More anti-squat will generally take away rear side bite, add forward bite, and let the
truck spring more off jumps, generating a higher arc in the air. A truck with more anti-
squat will ‘rotate’ easier in sharp corners. Less anti-squat will make the truck feel more
stable and locked-in. Generally anti-squat is a “feel” adjustment, changing the way the
truck drives more than the fastest lap. It’s another set-up change that’s really quick and
easy to do, so have a play with it and see what you like best.