Four Link adjustment and set-up

How a four-link works and general set-up and adjustments for modifed four bar suspension.

The Four Bar Set-up is a highly adjustable suspension that promotes traction and rear steer. When adjusted properly to track conditions and driving styles, the four link set-up can be a very effective weapon.

General Guidelines

  • Do not overtighten a racecar. To much traction (Left Rear) will not win races.
  • Adjust your chassis so you can keep the most momentum. Momentum requires less traction.
  • As a general rule- Upper 4 Link bars mostly affect corner exit, while the bottom 4-Link bars mostly affect the entry.
  • More angle in any bar adds more weight to that bar (traction) but also creates more rear steer.
  • Too much upward angle will create to much roll steer and/or can top shock out.
  • The trick is to find a happy median between traction and roll steer.
  • Bigger tracks require less upper four-link angle.
  • Smaller stop-and-go tracks require more upper four-link bar angle.
  • Upper bars are generally longer than lower bars to induce traction but limit rear steer.
  • Raising Left Rear Bottom 4 Link bar creates more "hike up" inducing roll steer and loosening car throttle
  • Lower Left Rear Bottom 4 Link bar holds chassis on spring more inducing less roll steer therefor loosening car on throttle

4 Link Adjustment Dirt Modified

TO TIGHTEN CORNER EXIT

  • Left Rear Top 4 Link Bar: Raise on chassis
  • Left Rear Bottom 4 Link Bar:Lower on chassis (Reduces roll steer and holds more spring load to tighten)
  • Right Rear Top 4 Link Bar: Lower on chassis
  • Right Rear Bottom 4 Link Bar: Lower on chassis.

TO TIGHTEN CORNER ENTRY

  • Left Rear Bottom 4 Link Bar: Lower on Chassis (More noticeable on throttle than deceleration)
  • Right Rear Top 4 Link Bar: Raise on chassis
  • Right Rear Bottom 4 Link Bar: Lower on chassis

TO TIGHTEN CORNER MIDDLE

  • Left Rear Bottom 4 Link Bar: Lower on chassis (On throttle)
  • Left Rear Top 4 Link Bar: Raise on chassis (On throttle)
  • Right Rear Top 4 Link Bar: Lower on chassis

TO TIGHTEN CORNER MIDDLE/EXIT

  • Right Rear Bottom 4 Link Bar: Lower on chassis

TO LOOSEN CORNER ENTRY

  • Left Rear Bottom 4 Link Bar: Raise on chassis
  • Right Rear Top 4 Link Bar: Lower on chassis
  • Right Rear Bottom 4 Link Bar: Raise on chassis

TO LOOSEN CORNER MIDDLE

  • Left Rear Top 4 Link Bar: Lower on chassis
  • Right Rear Bottom 4 Link Bar: Raise on chassis

TO LOOSEN CORNER EXIT

  • Left Rear Top 4 Link Bar: Lower on chassis
  • Left Rear Bottom 4 Link Bar: Raise on chassis
  • Right Rear Top 4 Link Bar: Raise on chassis
  • Right Rear Bottom 4 Link Bar: Raise on chassis

 

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