What class are you?

Decided by your effective power (base kW + any nitrous shot). C1 Street (0–160 kW) → C2 Sport → C3 Performance → C4 Competition → C5 Pro → C6 Elite → UL Unlimited (850+ kW). Class is purely about eligibility — what bracket you can race in.

A weighted blend of six axes — P:W 35% · Launch 20% · Grip 15% · Power 15% · Fuel 10% · Shift 5% — normalised against the class's typical floor and ceiling, then mapped onto D · D+ · C · C+ · B · B+ · A · A+ · S · S+ · X. So an optimised C1 daily can hit S+ in C1, and a poorly-specced C5 sits at C in C5.

Empirical curve fit against published roll-race splits (EVO 9, GT-R R35, Supra A90/MK4, FK8, M3 G80, etc.), scaled by tyre + drivetrain factors that grow with power. The ±tolerance widens at the extremes — drag-limited (pw < 0.20) and grip-limited (pw > 0.45) — and tightens in the mid-range power band where the model fits best (~±8%).

Top X% of [rank] — your position within the current rank rung, on a power-curve so the top of a tier feels earned (mid-tier ≈ Top 25%, near-top ≈ Top 1%). Top X% overall — your absolute place across the global build population (sigmoid model, RRI 9 ≈ Top 1% overall). Both are synthetic until the leaderboard fills with verified runs — then they switch to real quantile lookup.