FFB Basics Linearity Gain and When to Touch Car Setup Instead

Force feedback is how a sim talks to your hands. Assetto Corsa gives you car-specific detail, but wheel software and global gain choices can mask or distort that signal. New players often crank gain until the wheel buzzes, then blame physics for understeer that is actually tyre pressure and aero balance. This article separates FFB tuning from setup work so you adjust the right layer.

Hardware shoppers should read sim racing hardware and wheel reviews like G29 or T300 for product context.

Linearity first

Linear torque response means small forces at the rim still register—you feel limit adhesion before it vanishes. Nonlinear boost curves can feel exciting for ten minutes and lie about grip on long stints. Start linear, add flavor only after you can lap consistently.

Gain versus clipping

Gain increases overall torque. Clipping happens when the signal saturates—the wheel hits max torque and detail dies. If every corner feels same-y heavy, you are likely clipped. Lower gain until peak events (curbs, high-speed load) still leave headroom on telemetry bars if you use them.

In-game versus vendor software

Some wheels want 100 strength in-game and scaling in vendor panels; others prefer the inverse. Pick one primary knob and leave the other neutral to avoid double compression. Document your recipe when it works—updates love to reset it.

Spring and damper on real wheels

Many direct-drive users disable artificial spring and damper in driver panels for purer signal. Belt and gear wheels sometimes benefit from tiny damping to kill oscillation. There is no moral winner—only stability versus texture.

When setup—not FFB—is wrong

Persistent understeer on every car points to driving or global assist choices. Car-specific understeer on one vehicle points to setup: tyre pressures, ARB, wing, brake bias. Fix FFB when detail is wrong; fix setup when balance is wrong.

Temperature and tyre feel

Cold tyres feel like ice regardless of FFB genius. Give out-laps respect in practice; qualifying panic on cold rubber is a you problem, not a wheel driver bug.

FAQ

Should I copy a pro’s FFB file?
Only if same wheel class—NM curves do not translate 1:1 to gear wheels.

Is kerb rumble necessary?
Preference—some drivers mute extras for focus.

Does AC Ultimate differ?
Branding and packaging evolve—treat version notes as source of truth.

FFB is signal processing for your brain. Keep headroom, stay linear early, and let car setup do car things.

Logging sessions in a notebook

After each change, jot three numbers: lap time, a comfort rating from 1 to 10, and whether your hands hurt after twenty minutes. Pain means reduce gain or raise wheel height—injury-prone FFB settings are never fast settings.

Different cars, different peaks

GT3 cars mask tyre feel with aero; older street cars talk more about weight transfer. Expect to nudge gain per car class even if global defaults feel fine for one machine only.

When to reset to defaults

If you spiral for an hour, reset in-game FFB to defaults, restart AC, and touch only gain once. Complex presets stacked with vendor profiles create unpredictable nonlinearities nobody can debug remotely.