Road racing
A and S1 are the workhorse classes for learning Japan routes. A clean tune in these classes is easier to repeat, easier to upgrade, and more useful for weekly racing than a nervous max-power build.
A-class road tunes make handling problems easier to see. Start here when learning a new route or testing a new car.
S1 builds should feel like stronger A-class cars, not different cars entirely. Add speed only after corner exits are repeatable.
Japan road events can combine city corners, fast sweepers, elevation, and rain. A good road tune survives all four without becoming dramatic.
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