Ferrari SF90 steering gear 863091 290822
OEM Part Numbers: 863091 / 290822
The Ferrari SF90 steering gear (863091 / 290822) refers to the electric power steering rack assembly (steering box) used on the SF90 Stradale and SF90 Spider platform. It is the core component that converts steering wheel input into precise wheel direction control through Ferrari’s EPS system.
OEM Overview
- Part numbers:
- 863091 — Electric steering box / steering gear assembly
- 290822 — Associated steering system component / variant reference (configuration-dependent listing)
- Type: Electric Power Steering (EPS) rack / steering gear
- Application:
- Ferrari SF90 Stradale
- Ferrari SF90 Spider
Ferrari parts catalog listings confirm 863091 as the complete electric steering box for SF90 models.
Function
The steering gear is responsible for:
- Converting steering wheel rotation into rack movement
- Controlling front wheel steering angle
- Providing electric power assistance (EPS motor support)
- Integrating steering feedback and stability systems
In the SF90, this system is highly integrated with:
- Vehicle dynamics control (eSSC)
- Torque vectoring system
- Hybrid AWD front electric motors
- Stability and traction control systems
System Architecture (SF90 EPS)
The SF90 uses a fully electric steering rack system, meaning:
- No hydraulic power steering fluid
- Steering assistance is controlled electronically
- ECU adjusts steering feel based on driving mode:
- Comfort (lighter steering)
- Sport (heavier, more responsive)
- Race (direct, high-feedback tuning)
The steering gear communicates continuously via CAN bus with chassis control modules.
Engineering Characteristics
- High-precision rack-and-pinion system
- Integrated electric assist motor
- Variable steering ratio calibration
- Lightweight aluminum housing
- Motorsport-derived steering response tuning
The system is engineered for:
- High-speed stability
- Instant steering response
- Torque-vectoring compatibility (front axle control)
Role in SF90 Hybrid System
The steering gear works alongside:
- Front electric motors (torque vectoring)
- Electronic stability control (eSSC)
- Adaptive suspension system
- Brake-by-wire system
This allows Ferrari to actively adjust:
- Steering feel
- Cornering response
- Stability correction during acceleration and braking
Key Characteristics
- OEM Ferrari SF90 steering rack / steering box
- Part numbers 863091 / 290822
- Electric Power Steering (EPS) system
- Fully integrated with hybrid chassis electronics
- No hydraulic steering components
- Supports torque vectoring and eSSC systems
Common Replacement Reasons
- Steering rack wear or internal mechanical play
- EPS motor or sensor failure
- Collision or front-end damage
- Steering calibration faults
- Full chassis rebuild or restoration
Reviews
There are no reviews yet.