Customizing your car's performance is crucial for success in Forza Horizon 4. The 'Upgrades & Tuning' menu offers a deep level of customization, allowing you to tailor your vehicle to specific events or driving styles.
Upgrade Categories:
- Conversion: Engine swaps, drivetrain swaps (e.g., FWD to AWD), aspiration changes.
- Engine: Improve horsepower, torque, and responsiveness.
- Platform and Handling: Brakes, suspension, anti-roll bars, weight reduction.
- Drivetrain: Clutch, transmission, driveline, differential.
- Tires and Rims: Tire compound, width, rim size, and style.
- Aero and Appearance: Spoilers, bumpers, side skirts (some offer performance benefits).
Each upgrade affects your car's Performance Index (PI), which categorizes cars into classes (D, C, B, A, S1, S2, X). You can also fine-tune individual components like tire pressure, gear ratios, and suspension settings. If tuning seems too complex, you can download community-created tunes from the 'Find Tuning Setups' option, often optimized for specific events or car types.