X-6 Cubed Tuning Guide

K 030 X – 6 Cubed
Instruction Manual v1.0
Tuning Section Page 47
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TRANSMISSION HEIGHT
The X – 6 Cubed features X Factory’s adjustable-height transmission. While not the
easiest adjustment, it’s a very powerful tuning tool to adapt the car to different surfaces.
Included in Bag D (step D7) are several sets of transmission shims, four each of .030”,
.060”, and .090”. 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 the .060” and .090” setting, you’ll want to add more shims to the
motor plate support bracket. 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:
use the small shims between the wheel washer and outer wheel bearing to move the
axles in and out, keeping the CVD engaged in the outdrive at full droop without
bottoming out on compression.
Adjusting the height of the transmission changes the distance between the inner hinge
pins and outdrives which changes several things at once; a greater distance (higher
trans) allows the CVD to exert greater force on the suspension. It also changes the
car’s center of gravity slightly because you’re adjusting the height of the motor too.
Raising the transmission will give your car more forward bite. It effectively stiffens the
rear of the car, which means the car will break loose sooner in corners and will bounce
more over washboards or small bumps. A softer rear shock package is generally
recommended when running the transmission high. Lowering the transmission does the
opposite: less forward bite, but greater side bite and a smoother, more stable car
through rough sections.
FRONT AND REAR TOE ADJUSTMENTS
Toe-in (or out) is the angle of the tires to parallel when viewed from above. At zero
degrees of toe the tires are parallel to each other; toe-in is when the front of the tires
point toward each other, and toe-out is when the front of the tires point away. Front
wheel toe is easily adjusted by turning the steering tie-rods between the steering rack
and the steering blocks. Front tires are generally run with zero degrees of toe. Adding
some toe-out will increase initial steering, but can feel twitchy and wander-y. Toe-in will
stabilize the car, especially out of turns, but slows down the steering response and
slightly decreases corner speed.