Adjust the chassis rear roll center while you race!

January 17, 2019
Hyper Racing's brand new Jacob's Jacker ® (patent pending) is a system that allows the remote adjustment of the Jacob Ladder's roll center while you are in the cockpit on the race track.

The Jacob's Jacker is available for many types of racing and different rear geometry types:

  • 600cc Sprint Z-link style rear configuration: Fits Pace, Ten-J, PMP, D1, CS9, XXX, Farrell Chassis and many other manufacturers. Features dual mounting position 4-1/2", 5" and 5-1/2" spread. The 5-1/2" spread is 2-3/4" from center of rear axle, up and down. Available in 1-3/4" and 2" rear axle versions.
  • Midget and Lightning Sprint version: Fits all standard Midget and Z-link rear Lightning Sprint chassis. Uses a 1/2" rod end for the Jacob's ladder pick up and the torsion arm bolt. It is a 4-1/2" spread.
  • 600cc Sprint Wishbone style rear configuration: Fits all Hyper Racing wishbone chassis. Available for the standard (long) wheelbase and the X7 short wheelbase option. Available in 1-3/4" and 2" rear axle versions.
  • Full size Sprint Car version coming soon.

This unique adjuster moves the rod end that the Jacob's ladder bolts to up 1/2" or down 3/4" from center. That is 1-1/4" of adjustment! We have tested this unit on the track and adjustments can be made very easily under yellow at anytime, or under green while racing down the straight.

Click here to see the Jacob's Jacker in our online store.

The system is designed to use a CSI shock cable, but other brand cables may be used by using an adapter pin.

On the 600cc Sprint versions, a 7/16" shaft rod end with a 3/8" bolt hole is used (part number 71-PMX6-7). The larger shaft of the rod end will add extra strength to help keep the rod end from bending in an accident.

Being able to adjust the roll center while on the race track will help solve the biggest problem of dirt track racing: the ever changing track conditions. The rear roll center height controls how much weight is transferred to the right rear during a corner. It doesn't change how much total weight is transferred, just where it transfers to. By lowering the rear roll center, more weight will transfer to the right front (from the left front) and less to the right rear (off the left rear). This keeps more weight on the left rear resulting in more equally loaded rear tires creating more rear traction. If this explanation of how to achieve more rear traction sounds interesting to you, please read Mike's Rethink Dirt Paper.


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