DCA Series User Guide

Dirt King coilover & smooth body shocks have been designed and engineered to be specifically tuned to your vehicle application and are optimized for best performance when paired together.

Technical Notes

Pre-load and Ride Height

  • Dirt King shocks come factory charged to 100psi of Nitrogen. Releasing pressure may result in reduction of ride quality, poor performance, and shock malfunction. Do not fill shocks with any other form of compressed air other than Nitrogen as premature wear will occur to your shocks.
  • Dirt King shocks are shipped with application specific spring preload for optimum performance and ride quality. Damage to your shocks or vehicle could result by exceeding or removing too much preload.
  • Each turn of the preload collar is equal to +/- .060” of preload on the shock body – this is not the same as ride height.
    • Exceeding preload could result in coil bind or top out.
    • Not enough preload could result in bottoming out.
  • Do not fully back out locking screw on preload collar during preload adjustments, only loosen. Damage may occur to the shock body if fully removed.
  • Never adjust preload with the weight of the vehicle on the shocks. Vehicle must be safely off the ground with suspension free, It is best to perform this operation with shocks removed.
  • Before making any preload adjustments, record ride height measurements of your vehicle. Roll vehicle backward then forward to allow suspension to settle.
    • It is recommended you measure on level ground.
    • Measure from lower edge of fender to wheel hub center for best accuracy. This method will remove any variables in tire size or pressure differences.

  • It is common for vehicles to have different measurements between driver and passenger side due to factory components and fuel tank variables.

DCA Settings and Adjustments

Dual Compression Adjusters

Dirt King 2.5 series shocks are equipped with Dual Compression Adjusters (DCA). This allows the user added performance though high speed and low speed compressions adjustments. Your shocks have been tuned specific for your application and come preset to HS -5 & LS -7.

  • Adjustments are recorded from knobs all the way in (clockwise) and turning out (counterclockwise).
    • Low Speed Compression (gold knob) is factory set at 7 turns out.
    • High Speed Compression (black knob) is factory set at 5 turns out

Low Speed Compression

Low Speed Compression on a shock refers to the rate at which the wheel and shock are moving vertically slowly. This compression typically happens during cornering, braking, deacceleration, and when traversing large rolling bumps. Due to the need for shocks to respond gradually to smaller inputs, they initially move slowly before speeding up. Low-speed compression effects can also be noticeable on high-speed bumps, particularly if these bumps are small and occur frequently, or if the shock's valving is overly rigid.

When would I need to adjust Low Speed Compression?

  • If your vehicle feels bouncy or tends to bottom out on large rolling bumps, consider increasing the stiffness of the Low Speed Compression on your DCA.
  • To improve handling and reduce brake dive, tighten the Low Speed Compression adjuster.
  • If your vehicle feels rough on washboard roads or when encountering small bumps, consider loosening the Low Speed Compression Adjuster on your DCA.

High Speed Compression

High Speed Compression occurs when the wheel and shock are moving very very quickly. This compression occurs when encountering obstacles such as curbs, speed bumps, whoops, large potholes, and similar objects forcing the shaft to travel at very high and sudden rates of speed.

When would I need to adjust High Speed Compression?

  • If your suspension and tires are excessively slamming and bottoming out during hard impacts, you should raise the high-speed compression.
  • Because of the design of the DCA’s internal components, adjustments to high-speed compression are not as noticeable as adjustments made to low-speed compression.

Making Adjustments to your Shocks

Clicker settings are counted from turned all the way in and adjusting out. Example: -7 means 7 turns out.

  • High speed compression knob is the larger of the two knobs and is referred to as HS.
  • Low speed compression knob is the smaller of the two knobs and is referred to as LS.
  • Never have LS and HS adjusters more than 4 clicks different.
  • As you independently adjust in LS causing it to be more firm it will cause the HS to become more soft.

Making Adjustments to your Shocks

  • Soft: -8 LS / -7 HS (ideal for on road comfort).
  • Medium: -7 LS /- 5 HS (DK setting right out of the box, best balance for on road and offroad performance).
  • Firm: -5 LS / -3 HS (ideal for high speed off road and large dips or bumps).