Audi R8 4S Lamborghini Huracan 4T Front Steering Gearbox 4S1423072P

Part Number: 4S1423072P

The 4S1423072P is an advanced Electronic Power Steering (EPS) rack shared by the second-generation Audi R8 (Type 4S) and the Lamborghini Huracán platform. This specific “P” revision is a high-performance iteration of the steering gearbox, engineered to provide the surgical precision required for mid-engine supercars capable of speeds exceeding $320 \text{ km/h}$.

Technical Specifications

• Compatibility: * Audi R8: V10, V10 Plus, and Performance models ($2016$–present).

  • Lamborghini Huracán: LP610-4, LP580-2, Performante, and EVO variants.

• Steering Type: Servotronic EPS (Electronic Power Steering) with variable assistance.

• Drive Configuration: Left-Hand Drive (LHD).

• System Integration: Fully compatible with Audi Drive Select and Lamborghini ANIMA systems.

Key Performance Features

• Dynamic Steering Ratio: This rack is designed to work with variable-ratio software that adjusts the steering’s “directness” based on vehicle speed. It provides high-speed stability while allowing for effortless maneuverability in tight corners.

• LPI & LDVI Coordination: On the Huracán, this gearbox communicates with the Lamborghini Piattaforma Inerziale, while on the R8, it integrates with the chassis management system to provide active counter-steering torque in emergency maneuvers.

• High-Torque Electric Motor: Features a brushless DC motor mounted directly to the rack, providing instantaneous assistance and high-fidelity feedback without the power loss associated with traditional hydraulic pumps.

Professional Installation & Technical Requirements

Replacing a 4S1423072P steering gear involves more than just mechanical fitment; it requires a specialized digital setup:

1. Online Parameterization: The “P” revision must be flashed with a specific “dataset” using the Audi ODIS or Lamborghini LaRA diagnostic systems. This dataset tells the rack whether it is installed in an R8 or a Huracán, as the steering weight and return-to-center feel differ between the two brands.

2. Basic Settings (G85): The steering angle sensor must be zeroed out. If the sensor is even $1.0\text{°}$ off-center, the Electronic Stability Control (ESC) and Torque Vectoring systems will malfunction.

3. One-Time Use Hardware: The mounting bolts for this rack are stretch-bolts. For safety and to prevent the rack from shifting under $G$-load, these must be replaced with new hardware and torqued to the factory-specified angle.