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…
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 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 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.
The most common questions about engine codes, what they mean, how to find them and how this database works
The M860 RS is a cutting-edge, track-focused hybrid powertrain. Its long-term reliability for road use is projected to be excellent, but its complexity demands strict adherence to McLaren's specialized maintenance schedule, especially after track sessions. Key wear items like the DC-DC converter and inverter pump may need earlier replacement in high-performance applications.
The most documented issues are communication faults with the high-voltage DC-DC converter, premature failure of the electric motor inverter's dedicated coolant pump, and calibration drift in the high-pressure fuel pump. These are addressed in specific McLaren service bulletins for the 750S GT3 RS.
The M860 RS powertrain is used exclusively in the limited-production McLaren 750S GT3 RS (2023-Present). It is a bespoke, hybrid-optimized evolution of the M840T platform, designed specifically for this model's extreme track performance.
Yes, but with extreme caution. The M860 RS is already at the limit of its design. ECU remaps can yield modest gains, but significant power increases require upgraded turbos, fuel system, hybrid components, and engine internals. Such modifications void warranties and exponentially increase stress, demanding expert calibration and cooling solutions.
Fuel economy is not a design goal. Expect approximately 16-20 L/100km (14-12 mpg UK) in combined driving. Consumption will be significantly higher during spirited or track driving. The official EU combined figure is not published for this limited-run track car, but real-world figures are typically very high.
Yes. Like virtually all modern high-performance engines, the internal combustion component of the M860 RS is an interference design. A timing chain failure would almost certainly result in catastrophic valve and piston damage, requiring a complete engine rebuild.
McLaren mandates the use of its proprietary C30 specification oil, which is a 0W-40 synthetic. This specific formulation is critical for protecting the engine's bearings, turbos, and variable valve timing system under the extreme conditions the 750S GT3 RS is designed for.
Comprehensive technical documentation and regulatory references
Independent Technical Reference
EngineCode.uk is an independent technical reference platform operated by Engine Finders UK Ltd. We are not affiliated with MCLAREN or any other manufacturer. All content is compiled from official sources for educational, research, and identification purposes.
Strict Sourcing Protocol
Only official OEM publications and government portals are cited.
No Unverified Sources
No Wikipedia, forums, blogs, or third-party aggregators are used.
Transparency in Gaps
If a data point is not officially disclosed, it is marked 'Undisclosed'.
Regulatory Stability
EU regulations are referenced using CELEX identifiers for long-term stability.
MCLAREN Official Site
Owner literature, service manuals, technical releases, and plant documentation.
EUR-Lex
EU emissions and type-approval regulations (e.g., CELEX:32007R0715, CELEX:32017R1151).
GOV.UK: Vehicle Approval & V5C
UK vehicle approval processes, import rules, and MoT guidance.
DVLA: Engine Changes & MoT
Official guidance on engine swaps and inspection implications.
Vehicle Certification Agency (VCA)
UK type-approval authority for automotive products.
Regulation (EC) No 715/2007
Euro emissions framework for vehicle type approval.
Commission Regulation (EU) 2017/1151
WLTP and RDE testing procedures for emissions certification.
GOV.UK: Vehicle Approval
UK compliance and certification requirements for imported and modified vehicles.
VCA Certification Portal
Type-approval guidance and documentation.
Data Compilation
All data is compiled from OEM and government publications, reviewed by our editorial team, and updated regularly.
Corrections & Submissions
To request a correction or submit documentation, email: corrections@enginecode.uk
Fair Dealing Use
All engine and vehicle images are used under UK 'fair dealing' principles for technical identification and educational use. Rights remain with their respective owners.
Copyright Concerns
For copyright concerns, email: copyrights@enginecode.uk
GDPR Compliance
EngineCode.uk complies with UK GDPR. We do not collect personal data unless explicitly provided.
Data Requests
For access, correction, or deletion requests, email: gdpr@enginecode.uk
Trademark Notice
All trademarks, logos, and engine codes are the property of their respective owners. Use on this site is strictly for reference and identification.
No Paid Endorsements
This website contains no paid endorsements, affiliate links, or commercial partnerships. We do not sell parts or services.
Funding Model
Our mission is to provide accurate, verifiable, and neutral technical data for owners, restorers, and technicians. This site is self-funded.
All specifications and compatibility data verified against officialMCLAREN documentation and EU/UK regulatory texts. Where official data is unavailable, entries are marked “Undisclosed”.
All external links open in new tabs. Please verify current availability of resources.