Force Feedback Curve Tuning: What It Controls

What a force feedback curve controls

A force feedback curve is the mapping in a wheel's software between the force signal a racing game sends and the output the wheel motor is asked to produce. The game calculates a force for steering, kerbs, loss of grip and other events, and sends that as a number. The wheel's software and firmware then decide how that number becomes a request to the motor. The curve is that decision: the relation between what comes in and what the motor is told to deliver.

Every force feedback wheel has a curve of some kind, whether the setting is adjustable or fixed. Gear-driven, belt-driven and direct drive wheels all receive the same kind of game signal, and each maker defines its own response. The difference between wheels is not only the curve; it is the drive type and the stated torque, which the site compares on stated details. The drive types are explained in the direct drive versus gear driven guide and in force feedback versus no force feedback.

The usual settings in wheel software

Maker software and wheel menus usually name the same kinds of settings, even when the words differ. The list below explains them in general terms; the maker's manual gives the exact name for each wheel.

• Gain or strength: a multiplier applied to the whole force signal. Raising it asks the motor for more output at every point; lowering it asks for less.
• Linearity or curve shape: how the output responds across the input range. A linear curve keeps the relation even. A curved response changes the relation at low, middle or high input.
• Deadzone: a range of small inputs where no force is produced, so the wheel does not move around center when no force is requested. See wheel base deadzone settings.
• Damping or friction: a constant resistance that is part of the curve, not a response to a game event. In general terms, damping is always present and scales with speed.
• Clipping limit: the maximum output the base allows. When the requested force exceeds the limit, the output is capped at that figure. The cap is a stated property of the base, not something the game decides.

Where the curve settings live

The settings appear in three places: the wheel's own menus, the maker's software on a PC, and the game's force feedback menu. On a console, the wheel menus may expose fewer options than the PC software. On a PC, the maker's software is usually where the curve gets its name and range. The wheel base software configuration article explains the difference.

Maker pages show what a wheel can do, not how to set a curve. Fanatec's site points to setup guides and force-feedback tuning content for its wheelbases. Logitech's pages state the G923 as 2.3 Nm with TRUEFORCE and the RS50 base as 8 Nm direct drive with TRUEFORCE. Thrustmaster's site lists wheels for PC, PS5 and Xbox and includes a configure tool for building a setup. None of these pages give a curve value; the manual and support pages are where the settings are named.

What the curve does not change

A curve does not change the drive type, the stated torque, the pedals, the shifter or the game content. If a listing states a drive type and a torque figure, the curve sits on top of those. Changing the curve cannot turn a gear-driven base into a direct drive base, and it cannot raise the stated Nm figure. It only changes how the game's signal is mapped to the motor.

The curve also does not change the pedals. Brake, throttle and clutch response are separate settings, described on the maker's pages and in the pedal sensor types article. The force that comes from the pedals is a separate path from the force that comes from the wheel.

Approaching tuning for your taste

Tuning is a personal process. There is no single curve that works for every player, and the site cannot tell you which one you will prefer. What the site can do is give you a method that keeps the process clear. The force feedback effects guide lists the kinds of effects a game can send; the curve decides how the wheel presents them.

• Start from the maker's defaults and keep them for your first sessions.
• Change one setting at a time. Note the named value you set and what you were trying to change.
• Use the game's force feedback menu to name the effect you want more or less of, then check whether the wheel's curve adds to it or limits it.
• Ask the maker what each named setting does when the manual is unclear. The support pages are there for that.

Clipping and torque in the same sentence

Clipping is a limit in numbers. When a game requests more force than the base's stated figure allows, the output sits at that figure. The site compares torque as a stated figure, and the how much force feedback torque is enough article explains the role of the figure in a purchase. The force feedback clipping prevention article explains the cap in general terms.

In general terms, a higher stated Nm figure means the base can be asked for more output before the cap is reached. A lower figure reaches its cap with a smaller request. The curve decides how close the output gets to that cap across the input range, but it does not change the cap itself.

Questions to ask the maker before you adjust

Before you begin changing a curve, it helps to confirm what the maker offers. The questions below are what the site recommends you ask, because the site cannot answer them from the stated details alone. The maker's manual and support pages are the source for each answer.

• Does the manual name the curve settings and what each one changes?
• Are the settings in the wheel's own menus or only in the maker's software?
• Which settings are available on the console version, if the wheel has one?
• What is the stated torque figure, and does the page describe a clipping limit?
• Are the same settings available on PC and on console for the same wheel?

What to pick for your situation

Questions

What is a force feedback curve?

A force feedback curve is the mapping in the wheel's software between the force signal a game sends and the output the motor is asked to produce. It decides how a requested force becomes a request to the motor, before the motor's own stated limits.

Which settings appear as a curve?

Typical settings are gain, linearity, deadzone, damping and a clipping limit. The maker's manual names the settings for each wheel, and the site cannot add names that the maker's pages do not state.

Does tuning the curve change the stated torque?

No. The stated torque figure is a property of the wheelbase. The curve maps the signal up to that figure and the cap where clipping begins, but it does not raise or lower the stated figure.

Can I tune the curve on a console?

The wheel's own menus may expose fewer options on a console than the maker's software offers on a PC. The maker's manual and support pages describe what is available on each platform.

What should I change first?

Start from the maker's defaults. Change one setting at a time, keep a note of the named value, and use the game's menu to identify the direction you want before changing the wheel's curve.

Where do the settings live?

In the wheel's firmware menus, in the maker's software on a PC, and sometimes in the game's own force feedback menu. The maker's support pages say where each setting is on a given wheel.