2017 Ford M-Sport Fiesta RS Tune Guide

Tarmac circuits reward stiffer springs and lower ride height. For a S1-class AWD build, expect ~2.1–2.3 Hz front / rear ride frequency, soft toe-out front for turn-in, and aero biased ~50% front / ~70% rear.

Hard-pack dirt drops spring rates and damper stiffness by half vs. road. Expect higher ride height (~5 in), more positive front camber (less than road, ~-1.5°), and zero aero (dirt removes downforce settings).

Mixed surfaces need the softest springs of all surfaces and the most ride height. Toe stays near 0° for stability over jumps. AWD cars want a tight rear diff to keep both wheels working when one leaves the ground.

1/4-mile launches kill compression damping (front rises off the line) and want max grip out back. Drop rear pressure to ~25 psi, max rear diff accel for wheel sync, and remove all aero.

Drift tunes are deliberately rear-unfriendly: high rear pressure (~38 psi) to break grip, max rear diff accel for sustained slides, low rear camber (~-1°). Caster jumps to ~6° for self-centering at angle.

Targeting maximum velocity. Gearing stretches with ~5% higher top speed than the class default, rear aero drops by half to cut drag, and ride height drops further to slip the air.