I took this from ultramax's website but should be true with the PRC as well>>>>>>>>>>>>>
For this season, Ultramax Racing Chassis has implemented Ackerman adjustability on our chassis. The function of Ackerman in front-end geometry is to turn the inside tire at a higher rate than the outside tire. This is based on the geometric understanding that the left front tire is traveling on a tighter arc than the right front tire.
In most cases your desired Ackerman setting will be with the left front tie-rod end one hole closer to the king pin bolt than the right front tie-rod end. In unison with the correct Pitman arm angle, this will give you the correct amount of left front steering lead for most conditions.
Although this setting will be ideal for most track conditions you may encounter certain situations that you will benefit from a change in Ackerman. On a fast, hard biting racetrack, moving the left front tie-rod end forward another hole may free the front-end up from the apex to corner exit, allowing for you to exit the corners lower without binding the chassis or engine RPM’s (picture above). Likewise, on a slower racetrack that lacks bite, you may find it helpful to move the left front tie-rod end back a hole to stabilize the chassis on corner entry to the apex.
As with all adjustments on our chassis, if you are not comfortable with the adjustments or just like to keep your adjustments simple, we recommend that you run the settings that we recommended above. These are settings that will be ideal for all situations and will not hinder performance under certain track conditions like the other settings may, if the wrong adjustment is made. Now that we have discussed Ackerman settings we are ready for step 5, squaring the chassis.
As has been posted you move the tie rods closer to the king pins. If you want to you can get even more by offsetting so the LF is forward and the RF is back. However, if I change ackerman it is typically to run less than stock, not more.