What is Caster?
Caster is the angle of the steering block kingpin as it leans toward the rear of the car. There is more to it than that, though. Caster is also directly affected by Kickup. If you have 0deg Caster blocks and 2deg of Kickup, you really still have 2deg of Caster. So, using this formula, 4deg Caster blocks (and 2deg of Kickup) actually gives you 6deg of Caster (4 in the blocks and 2 in the Kickup).
Tuning with Caster
More Caster will make your car easier to drive. It will also make it more stable on the straights and through bumpy sections. Less Caster will give the car more front bite into corners and make it react quicker to steering inputs. Less Caster will also make your car feel a little more twitchy.
You can change Caster by replacing the front Caster blocks. ALL Caster blocks ARE directional (except for 0deg blocks). If you put the left Caster block on the right, you’ll end up with 2deg of, well, I guess Anti-Caster!!! (the kingpin will lean FORWARD instead of back). Some cars change Caster by placing small clips on the upper suspension arm hinge pin (this applies to pivot ball suspension vehicles). Either way, most cars use 0, 2, 4 or 6 degrees of Caster as an adjustment.
Back to the RC Suspension Tuning Guide.