How do you tune electric power steering for optimal steering feel?

EPS tuning involves setting torque assist maps, return-to-center characteristics, damping, friction compensation, and torque filtering. Key parameters include base assist level (varies with speed), boost curve shape, hysteresis for on-center feel, active return torque, and inertia compensation. Tuning considers driver effort targets (typically 3-5 Nm on-center), road feedback transmission, steering precision, and stability at high speeds. Objective measurements are correlated with subjective ratings to achieve desired feel.