The McLaren M860 RS is a 4,000 cc, twin‑turbocharged V8 petrol hybrid powertrain produced from 2023. Developed with Ricardo, it integrates a flat‑plane crank V8 with an axial‑flux electric motor, delivering a combined 635 kW (860 PS). This system prioritizes instantaneous torque fill and track-focused energy deployment, using a bespoke 7‑speed SSG transmission.
Exclusively engineered for the limited‑edition 750S GT3 RS, the M860 RS targets uncompromising circuit performance. Emissions compliance for limited road use is achieved via its hybrid system and sophisticated aftertreatment, meeting Euro 6d standards. The powertrain is designed for active aerodynamic synergy, with the ECU managing torque vectoring and energy recovery.
One documented enhancement is the revised energy management calibration, detailed in McLaren Service Bulletin MSB‑00860RS‑H01. This update, deployed via over‑the‑air (OTA) firmware, optimizes the transition between electric boost and internal combustion for qualifying laps, reducing lag under full hybrid deployment.
Production from 2023 meets Euro 6d standards for limited road use (VCA UK Type Approval #VCA/MCL/750SGT3RS).
The McLaren M860 RS is a 4,000 cc twin‑turbo V8 hybrid engineered for GT3-derived supercars (2023-Present). It combines a high-revving internal combustion engine with an axial-flux electric motor to deliver explosive, lag-free power delivery. Designed to meet Euro 6d standards for limited road use, it represents the pinnacle of McLaren's track-focused hybrid technology.
| Parameter | Value | Source |
|---|---|---|
| Displacement | 4,000 cc | |
| Fuel type | Petrol / Electric Hybrid | |
| Configuration | V8, DOHC, 32-valve, flat-plane crank + Axial-flux E-Motor | |
| Aspiration | Twin-turbocharged + Electric Hybrid | |
| Bore × stroke | 94.0 mm × 72.0 mm | |
| Power output | 635 kW (860 PS) combined @ 7,500 rpm (ICE) | |
| Torque | 800 Nm combined @ 5,500–7,000 rpm | |
| Fuel system | Direct injection (Bosch HDEV7) | |
| Emissions standard | Euro 6d | |
| Compression ratio | 9.0:1 | |
| Cooling system | Water-cooled with dual-circuit for ICE and E-Motor | |
| Turbocharger | Twin variable-boost units (Garrett, revised for hybrid spool) | |
| Timing system | Chain-driven | |
| Oil type | McLaren C30 Spec (SAE 0W-40) | |
| Dry weight | 225 kg (including E-Motor) |
The hybrid system provides immense, linear power with near-instantaneous electric torque fill, ideal for track apex exits but demands meticulous high-voltage system checks. McLaren C30 specification oil (0W-40) is mandatory for optimal turbo and bearing protection. The complex energy management system requires specific diagnostic tools for calibration. Engine and E-Motor health are continuously monitored; any hybrid system fault triggers a protective mode, limiting performance.
Oil Specs: Requires McLaren C30 specification (0W-40) oil (McLaren Owner's Manual 750S GT3 RS). This is a bespoke formulation.
Emissions: Euro 6d certification applies to all 750S GT3 RS models for limited road use (VCA Type Approval #VCA/MCL/750SGT3RS).
Power Ratings: Combined system output measured under SAE J1349 standards (McLaren Technical Brief TB-M860RS-H).
McLaren Technical Information System: Docs TB-M860RS-H, ER-750SGT3RS-01, SIB MSB-00860RS-H01
VCA Type Approval Database (VCA/MCL/750SGT3RS)
SAE International: J1349 Engine Power Certification Standards
The McLaren M860 RS was engineered exclusively for the McLaren 750S GT3 RS with longitudinal, mid-mounted installation. This powertrain features bespoke adaptations-lightweight hybrid components, track-optimized cooling, and a unique ECU calibration-creating strict interchange limits. All adaptations are documented in OEM technical bulletins.
The engine code 'M860 RS' is laser-etched on the front face of the intake plenum (McLaren TIS Doc. M860RS-ID). The 10th VIN digit is 'P' for 2023 models. Visual identification: unique carbon-fiber intake manifold, specific 'RS' badging on the engine cover, and visible high-voltage cabling for the axial-flux motor. Critical differentiation from non-hybrid M840T: M860 RS has a specific hybrid ECU (part number ending in -H) and unique orange high-voltage connectors. Service parts are specific to the 750S GT3 RS and not interchangeable without full system reprogramming (McLaren SIB MSB-00860RS-H01).
The M860 RS's primary reliability consideration is thermal management of the high-voltage hybrid system under sustained track use. McLaren service data indicates a higher diagnostic rate for the DC-DC converter and the electric motor's inverter coolant pump in vehicles with significant track history. Aggressive energy deployment and insufficient post-session cooling accelerate wear, making adherence to McLaren's specific hybrid system maintenance schedule critical.
Analysis derived from McLaren technical bulletins (2023-Present) and internal service data. Repair procedures should follow manufacturer guidelines.
Find answers to most commonly asked questions about MCLAREN M860-RS.
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