e. Double check by repeating Steps B and C. a. More toe out would help the nose of the car (mostly off throttle). b. Too much toe out could make the car loose on corner entry or create excessive front tire temperatures and tire wear.
18. Ackerman. A. Ackerman is when your toe out increases as you turn the front wheels left or right. Our cars are built with ackerman in order to give the cars a better nose. B. Adjustable ackerman is an excellent adjustment and is be coming more and more popular. This is done with an adjust able left front spindle which allows you to shorten the steering arm length. By shortening the left front steering arm, the left front wheel will turn faster than the right front wheel which in turn will increase toe out when turning left. C. Always reset the toe after changing the ackerman. D. The difference between toe and ackerman is that more ackerman will not have the drag or friction on the front tires down the straightaways that toe would. 19. Set bump steer. A. Right Front: .010 to .020 bump out per inch of compression. B. Left Front: .005 to .010 bump out per inch of extension. C. The following must be done prior to setting bump steer. 1. Camber 2. Caster 3. Rack centered to lower a-frames 4. Lower a-frames set to same angle as at ride height 5. Remove shocks and springs from front end D. We check bump steer by raising the right front 1” at a time for a total of 3”. We recommend for the right front approximately .020 bump out per inch. We are primarily concerned with the first two inches. The reason being that an asphalt modified rarely has more than two inches of right front bump. E. To check the left front, we drop the left front 2” from the right height. We recommend .005 to .010 bump out in this travel. The main concern is that the left front never bumps in. F. To adjust bump steer: G. On a Pinto or Fairmont type rack, your pivot point is not adjustable. This 4
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Asphalt Modified Set-Up & Technical Guide