The DCMS can output any point along the roll center/moment center axis. Typically, we look
at the point on the line between the front tires as this is the data point that most testing and
published results have referenced today. However, we are also closely monitoring the
positioning changes of the moment center axis in addition to the point on the moment center
axis located vertically underneath the center of gravity (as the center of gravity is the top of the
moment arm whose length determines how much roll the forces at the center of gravity will
|Dynamic Chassis Measuring System
are based on a late
model set up for
Caraway Speedway and
would apply to any
asphalt track of similar
length, radius, and
Ackermann is the difference in the turn radius between the front tires. A positive number
for Ackermann in our charts indicates the left tire turns faster than the right tire. A
negative number indicates the right tire is turning faster than the left tire which is
At ride height, we recommend setting the Ackermann to between 0 and .2 degrees. At full
compression we like to see the Ackemann between .1 and .6 degrees.
We have had cases where the driver indicates the car turns better with more Ackermann
(ie. anywhere between 2 and 5 degrees). What we have discovered that this is actually
covering up the real issue of the moment center being either too far right or too far left.
We recommend moving the moment center closer to the center of the car and taking the
Ackermann down to less than a degree. The car turns and you will not be scrubbing
speed off in the turns dragging the left tire.