Tune the exact car for one job, not for a universal number
The current public references do not support exact gear ratios, field limits, costs, or a universal fastest tune. Use only the settings visible in the official Midnight Chasers place, ID 13822562292.
Save a baseline, decide what you want to improve, change one available field, repeat the same route, and restore the original value when the tradeoff is worse.
Use a one-change-at-a-time tuning method, test log and explicit other-game contamination warning.
This correct-game tuning method keeps a reusable test log and leaves unknown values unknown.