RC racing and rear shock oil explained.

Shock oil in an RC car's rear suspension plays a crucial role in controlling its performance, traction, and stability. Shock oil determines the viscosity of the fluid inside the shocks, affecting how quickly the shocks compress and rebound in response to various forces. Here's how shock oil can impact the rear of an RC car:

Damping Rate:

  • Thicker Oil (Higher Viscosity): Thicker shock oil slows down the movement of the shock absorbers, resulting in a slower compression and rebound. This can help prevent excessive weight transfer during acceleration, improving rear-end stability.
  • Thinner Oil (Lower Viscosity): Thinner shock oil allows for faster shock compression and rebound. This can be useful for quick weight transfer during launches, but it might also lead to more dynamic weight shifts.


  • Thicker Oil: Thicker shock oil can help maintain consistent traction by preventing the rear suspension from reacting too quickly to surface irregularities. This is especially important in drag racing, where traction is critical.
  • Thinner Oil: Thinner shock oil might offer more traction on smooth surfaces but could result in the rear end feeling looser on rough tracks.

Weight Transfer:

  • Thicker Oil: Thicker shock oil resists rapid weight transfer, which can help prevent the rear end from lifting excessively during acceleration (wheelies). This enhances traction and stability.
  • Thinner Oil: Thinner shock oil promotes quicker weight transfer, which might be beneficial for launching the car more aggressively but can lead to reduced rear tire grip.

Launch Performance:

  • Thicker Oil: Thicker shock oil can help prevent the rear end from rising too quickly during launches, maintaining better tire contact with the track for improved acceleration.
  • Thinner Oil: Thinner shock oil might allow the rear end to rise more during launches, which could help with weight transfer for quicker acceleration but might also lead to less traction.

Handling Balance:

  • Thicker Oil: Thicker shock oil can contribute to a more stable and predictable handling balance, especially during high-speed runs.
  • Thinner Oil: Thinner shock oil might make the car feel more responsive but can also make it more sensitive to track conditions and surface changes.


  • Thicker Oil: Thicker shock oil provides more resistance and damping, which can be beneficial for tuning rear-end stability on high-grip tracks or for minimizing weight transfer.
  • Thinner Oil: Thinner shock oil offers quicker shock response, which can help with fine-tuning weight transfer and traction on lower-grip surfaces.

It's important to note that the optimal shock oil viscosity for an RC drag car's rear suspension depends on factors such as track conditions, tire grip, chassis setup, and personal driving preferences. Experimenting with different shock oil viscosities and observing how they affect traction, weight transfer, and stability will help you find the setup that works best for your specific racing goals.

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