Cars – Steering - ac-custom-shaders-patch/acc-extension-config GitHub Wiki

Real-Feel Steering

Enables CSP’s Real-Feel force-feedback module.
This normalizes steering torques to your sim wheel's steering torque (which is specified in CSP settings in CM) such that what you feel is 1:1 with what the simulation is producing.

This system also includes a power steering module for cars with power steering (most modern vehicles).

Enable in car.ini:

[CONTROLS]
ENABLE_REAL_FEEL=1 ; enables CSP's real steering forces. Required for power steering. Defaults to unassisted torque.

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Power Steering System

Adds simulation of electric or hydraulic power steering assist.
Real steering effort is computed via Real-Feel, then CSP performs a power steering system simulation to produce the net torque that is sent to your wheelbase.

Maximum Assist Torque

ASSIST_TORQUE_MAX = 90 ; maximum assist torque of the system in Nm

Defines the ceiling for how much torque the power-steering system can apply.
Higher values = stronger assist, lighter steering feel.

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Steering Assist Maps

Lookup tables defining how the power steering system responds to driver-applied torque, outputting an assist factor from 0–1.

ASSIST_MAP_0=car_steer_assist_map0.lut ; driver torque (Nm) | assist factor (0–1)
ASSIST_MAP_1=car_steer_assist_map1.lut ; additional assist maps allowed without limit

Notes:

• Values should map driver input torque → ratio of ASSIST_TORQUE_MAX applied.
• Desmos to help visualize how the system works: https://www.desmos.com/calculator/qjxnqdr4zx
• You can define any number of maps (ASSIST_MAP_2, ASSIST_MAP_3, etc.).

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Power Steering Setup Option

Defines an in-game setup slider for selecting the power steering assist map (or assist level).
Appears in the setup menu under the defined tab and naming.

Example — setup.ini:

[POWER_STEERING_SETTING]
SHOW_CLICKS=0
TAB=GENERAL
NAME=Power Steering
MIN=0    ;always 0, can also use LUT setup options
MAX=1    ;maximum index specified in car.ini
STEP=1
DEFAULT=0 ;default map
POS_X=0.5
POS_Y=6
HELP="Power Steering Assist - Note: Power steering requires real steering forces to be enabled in CSP settings!"

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Rack Travel Lookup Table

Defines the steering rack displacement as a function of steering wheel rotation.
This allows non-linear steering ratio behavior (common in real cars due to u-joint nonlinearity and variable speed rack systems).

Example — car.ini ([CONTROLS] section):

[CONTROLS]
RACK_TRAVEL_LUT=car_susp_rack_travel.lut ; steering wheel degrees | rack travel (m). Mirrored; no negative X values needed.

Notes:

• The LUT expects values only for positive steering angles — CSP mirrors the table automatically.
• Allows accurate simulation of variable-ratio steering racks or u-joint nonlinearities.
• For u-joints, can use this Desmos helper tool: https://www.desmos.com/calculator/hhtnwqoaxv (not for the faint of heart)

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