The McLaren Artura in detail

The McLaren Artura in detail

17.02.2021: Every drop of McLaren’s technical expertise and experience has been channelled into making the all-new Artura extraordinary to drive and wonderfully enjoyable to own.

Every drop of McLaren’s technical expertise and experience has been channelled into making the all-new Artura extraordinary to drive and wonderfully enjoyable to own. Ever since the 12C revolutionised the supercar segment a decade ago, McLaren Automotive has continued to push the boundaries of supercar innovation.



The McLaren P1™ brought McLaren hybridisation to the hypercar sector as long ago as 2012. The Speedtail introduced astonishing new levels of hybrid performance, its 403km/h (250mph) maximum speed making it the fastest-ever McLaren.



The brief for the Artura was even more challenging: to create a series-production High-Performance Hybrid supercar that excels on every level, with performance, engagement and efficiency sharing equal top-billing. The engineering and design team approached the challenge holistically – no single part of the process was undertaken in isolation – with ambitious targets set in every area: weight; performance; driver engagement; efficiency; agility; refinement; quality and usability.



Every target was met – and in most cases, surpassed – heralding the arrival of the Artura as a next-generation McLaren High-Performance Hybrid that introduces a new supercar era.



“The way we design cars at McLaren is different. We use a holistic approach comprising both technical design and studio design, areas that in the automotive industry are often separated and sometimes even compete; McLaren sees these pillars as integrally linked and working towards common goals.”


Dan Parry-Williams, Director of Engineering Design, McLaren Automotive








Super-lightweight engineering



McLaren Carbon Lightweight Architecture (MCLA)


    The Artura is the first McLaren to use MCLA, which is designed and produced at McLaren Composites Technology Centre in Sheffield, UK

    Optimised for High-Performance Hybrid models, MCLA comprises three elements: carbon fibre monocoque, electrical architecture and chassis and suspension structures

    Carbon fibre monocoque is safer, stronger and like-for-like lighter than previous McLaren monocoque
s



“The new McLaren Carbon Lightweight Architecture (MCLA) is quite literally at the core of the super-lightweight engineering philosophy that is inherent throughout the Artura. We developed this all-new, High-Performance Hybrid supercar with all of our learnings from decades of working with advanced composite and other lightweight materials, using world-first processes and techniques to deliver weight savings that offset heavier hybrid powertrains, ensuring greater energy efficiency and maintaining the outstanding agility and dynamic performance our customers expect.”
Jamie Corstorphine, Director of Product Strategy, McLaren Automotive



To achieve the very specific aims of the Artura programme McLaren started right at the core of its new supercar, with a completely new carbon fibre architecture. This had to not only be true to the company’s philosophy of super-lightweight engineering for dynamic and performance reasons, but also crucially to offset the extra weight of a hybrid powertrain, as well as being tailored to accommodate the battery pack.



The new architecture – called McLaren Carbon Lightweight Architecture (MCLA) – features three elements: an all-new carbon fibre monocoque occupant structure, a new chassis with aluminium crash beams and rear subframe, and a first-to-market domain-based ethernet electrical architecture.



Four years in the making, MCLA is the first architecture to be manufactured at the McLaren Composites Technology Centre (MCTC), a new, state-of-the-art facility in the Sheffield region. Flexible in application (but physically incredibly stiff and strong) this scalable platform architecture heralds the beginning of a new era of McLaren supercars.






Carbon fibre monocoque


At the centre of the new platform is the carbon fibre monocoque. McLaren pioneered composite technology in Formula 1™ racing nearly 40 years ago and first transferred it to the road in the carbon fibre chassis and body of the McLaren F1. When the 12C was unveiled in 2009 it introduced a unique one-piece moulded carbon fibre chassis that was 25% stiffer than an equivalent all-metal structure and 25% lighter than a comparable aluminium chassis. McLaren’s revolutionary technologies also allowed carbon fibre monocoques to be productionised in volumes never before achievable.



The McLaren Artura marks another revolutionary leap. No McLaren monocoque, whether designed for the road or race track, has ever had to do more: the carbon fibre structure now additionally provides a safety cell for the battery pack and integrates further crash and load-bearing functionality. Yet it remains incredibly lightweight, weighing just 82kg including battery compartment, aero surfaces, B-pillars and door-hinge fixings, contributing to the low overall weight of the Artura, despite its 130kg of hybrid components.



At first glance, the MCLA monocoque may appear similar to other McLaren carbon fibre structures, but the geometry of every surface is new, and it is constructed from four new carbon materials, a new resin system and a new structural core material. These new properties accommodate both the platform requirements and new, bespoke mechanised production processes now on stream at MCTC.



The in-house approach ensures McLaren can constantly innovate monocoques to accommodate new technologies or new models, without compromising the qualities that ensure its chassis are the lightest, stiffest and strongest in their class.



The MCLA monocoque is taller around the A- and B-pillars than previous McLaren monocoques, as it integrates additional strength and load-bearing functionality into the carbon structure, replacing bonded metal parts. The windscreen surround is also carbon fibre. To achieve the requisite battery and fuel-tank safety cell, the sides of the monocoque extend back beyond what would traditionally be seen as the rear bulkhead. This provides side impact protection for the battery pack and also the fuel tank.



There is an exacting tolerance to the monocoque dimensions of +0.75mm across the structure with the tightest tolerances between machined features down to +/-0.25mm. This is fundamental to factors such as the accuracy of the suspension geometry control. Additionally, the high torsional rigidity of the monocoque ensures less compromise for the flexibility of the suspension itself, further enhancing the unique balance between supple ride and precise handling.



The structure also plays a role in aerothermal optimisation. Chamfered corners at the trailing edge of the front wheelarches guide airflow out of the arches and along the underside of the doors. The extended outer skin of the doors traps the air in this channel and it is driven rearwards into intakes that feed the lower portion of the high-temperature radiators (HTRs).





Chassis structure



Situated at either end of the carbon fibre monocoque are aluminium subframes that provide the Artura’s deformable crash structures. Designed to absorb impacts, the structures can be repaired or replaced easily and very cost effectively. Cars with a full aluminium or steel chassis use their entire structure to absorb and crumple on impact, causing more damage to the whole structure, often including the passenger cell.



On the Artura, the front upper wishbone is mounted to the carbon monocoque, while the lower wishbone is attached to the aluminium crash subframe. The rear subframe is bolted to the monocoque, with the carbon fibre floor beneath the battery bridging the lower cross members transversely across the vehicle, ensuring the required torsional stiffness and optimising the rear frame weight. The length of the lower portion of the frame is shortened to accommodate a bespoke rear diffuser, and the geometry of the new multi-link wishbone rear suspension concept is particularly aggressive.




Electrical architecture


Just as the carbon fibre monocoque incorporates greater functionality than any previous McLaren structure, so too does the electrical system. The Artura debuts an array of firsts for McLaren, including advanced driver-assistance systems (ADAS), Over-The-Air (OTA) software updates and Pirelli Cyber Tyre® tyre-monitoring technology. These are all made possible by the new electrical architecture, which also supports an all-new McLaren Infotainment System (MIS II).



Additionally, the complex powertrain necessitated an electrical architecture that can control McLaren’s first gasoline direct injection (GDI) fuel system at 350 bar; completely new transmission software; the E-differential and e-reverse functionality; battery management and implementing the different types of driving experience via the integration of the electric drive and engine drive.



To achieve all of this, McLaren is one of the first-to-market with a zonal domain-based ethernet architecture as the core backbone of the vehicle. The technology is the stepping point towards the industry trend of vehicle architecture redesign.



The domain-based ethernet system utilises four controllers, each positioned in a key area within the vehicle to optimise data rates and cable lengths. Placed in the same zones as the loads they control, the controllers are connected, via ethernet, through a central gateway. Linked functions at the front, rear or across the vehicle don’t need independent wiring and control systems, but instead transfer data via this central ‘backbone’.



By moving to a single standard, all communications can coexist on the same ethernet network. Spreading outwards from each domain, data transfer still occurs via LIN (Local Interconnect Network) and CAN (Controller Area Network) for subsystem communication but processing power has increased. The use of the domain-based technology has reduced the length of cabling in the vehicle by 25%, reducing weight by more than 10%.



This has been achieved while at the same time significantly upgrading the electrical capability of the vehicle – and adding new technologies such as the advanced driver-assistance systems (ADAS) features that debut in the Artura. The processing tools are integrated, with centralised software that can be constantly scaled and upgraded as new functionality becomes available, creating a platform that can adapt to future legislation and technology.



The advantage of this will most immediately be obvious to the owner because it allows for Over-The-Air (OTA) updates. When connected via wi-fi, either at home or via a hotspot, the vehicle is able to download new software when it becomes available. Updates related to vehicle safety will require a visit to a McLaren retailer, but OTA updates mean the customer can spend more time in their vehicle and instantly enjoy the benefits of newly downloaded functionality.



Working across all of these systems are new cyber security protocols, with enhanced algorithms. And in addition to OTA updates, depending on market the new electrical architecture includes integrated stolen vehicle tracking within the telematics as well as E-call, which can dial emergency or recovery services in the event of an accident or breakdown.   





eHVAC system



The new Artura platform also incorporates a new electric heating, ventilation and air-conditioning (eHVAC) system, designed to work with or without the assistance of the internal combustion engine. The compact unit, incorporating electric compressor, condenser and evaporator, is located in the front of the car to improve weight distribution, without the need for ‘pipework’ to run forward from the engine. Not using the internal combustion engine to drive the compressor allows optimal control of compressor speed for better cooling in arduous conditions.



The eHVAC system is able to heat or cool quicker than a conventional HVAC system, and provide greater precision between chosen temperatures. It uses a diffused vent that runs horizontally across the dashboard. This design increases flow into the cabin at lower velocities and with consequently improved occupant comfort and reduced system noise.






High-Performance Hybrid powertrain



The benefits of a High-Performance Hybrid powertrain are already in evidence in McLaren’s current range with the Speedtail – and of course previously from the McLaren P1™. The Speedtail has the greatest power and torque of any McLaren road car, with a combined 1,070PS (1,055bhp) and 1,150Nm (848lb ft) and even though it is an ultra-limited hypercar, the exhaustive development that produced it – and the philosophy of greater efficiency and lower emissions without compromising performance – helped to define the Artura’s unique attributes of hypercar innovation in a series-production supercar.



The Artura’s hybrid powertrain combines an all-new twin-turbocharged six-cylinder petrol engine together with an industry-leading axial flux electric motor (E-motor) integrated within an all-new eight-speed transmission, and a lithium-ion battery pack.



The combined output of the High-Performance Hybrid powertrain is 680PS and 720Nm, with the torque of the E-motor ensuring instant throttle response. Straight-line acceleration of 0-100km/h (62mph) is achieved in 3.0 seconds and 0–300km/h (186mph) in just 21.5 seconds; yet at the same time the Artura is capable of driving up to 30km on battery power alone, making the car fully zero- emissions capable for most urban journeys. The cleanest and most efficient McLaren road car ever, the Artura returns more than 50mpgand 129g/km CO2 on the EU WLTP cycle*.



The McLaren Artura has four Powertrain modes, covering every driving requirement: E-mode, Comfort, Sport and Track. E-mode is the default for silent start-up and zero-emissions, fully-electric driving. In Comfort mode, the V6 petrol engine runs in tandem with the E-motor, with maximum assistance for fuel saving. In Sport model, the E-motor provides torque infill at lower revs, while the V6 targets maximum performance. Track mode delivers the same blend of hybridised power, with transmission software delivering faster shifts.









All-new V6 petrol engine


    2,993cc twin-turbocharged V6; 120° v-angle with turbos in ‘hot vee’

    Develops 585PS – a specific output approaching 200PS per litre – and torque of 585Nm

    Light and compact: 50kg lighter and 190mm shorter than McLaren V8 engine



“Our all-new V6 engine is compact, light, powerful and extremely efficient. The dimensions aided packaging of the hybrid system and enabled a lower centre of gravity for the Artura, while the 120° vee design allowed us to have a very short and stiff crankshaft, which means the engine can rev all the way to 8,500rpm, delivering the drama and excitement you expect from a McLaren supercar.”



Richard Jackson, Head of Powertrain, McLaren Automotive




Designed by McLaren engineers to set new standards for smaller capacity V6 turbocharged engines, an all-new 3.0-litre V6 is at the heart of the Artura’s powertrain. Generating 585PS (577bhp) and 585Nm (431lb ft) of torque, the M630 produces more PS per litre than any McLaren engine except for the 4.0-litre V8 of the Elva and McLaren Senna.




Lightweight – at just 160kg it weighs 50kg less than a McLaren V8 – and extremely fuel efficient, its unique wide-angle configuration and compact size enable a High-Performance Hybrid powertrain package that is shorter than McLaren’s V8 engine and seven-speed transmission. That’s all the more impressive given the addition of an eighth gear, as well as the inclusion of McLaren’s first electronically controlled differential.



Mounted longitudinally and driving the rear wheels, the engine is a 2,993cc dry-sump V6 with an 84.0mm bore and 90.0mm stroke. Valve timing is continuously variable. Peak power of 585PS (577bhp) is produced at 7,500rpm, with the redline at 8,200rpm (8,500rpm intermittent). 585Nm (431lb ft) of torque is generated from 2250-7000rpm. Gasoline direct injection (GDI) operating at 350bar pressure ensures precise fuelling for increased power and reduced emissions, with one central injector per cylinder, while Gasoline Particulate Filters (GPFs) and catalytic converters ensure all legislative requirements are met.



The engine employs a 120˚ ‘hot vee’ layout. This configuration allows shared crank pins enabling a very short and stiff crankshaft appropriate for high power, high-revving engines. The wider angle brings advantages that include a lower centre of gravity and the creation of a cavity within the vee to house the twin turbochargers. This is one of the factors that makes the engine 220mm narrower than McLaren’s twin-turbocharged 4.0-litre V8, its compact nature assured by additional advantages in length and weight.



The ‘hot vee’ configuration additionally optimises performance and emissions. This enables short, equal-length exhaust runners feeding the turbos, allowing faster spooling with very close-coupled catalysts feeding straight to the rear with minimal pressure drops.



Unusually no-scroll turbochargers are symmetrical, removing the performance compromises usually seen in the exhaust and intake systems of twin-turbo vee engines. The system uses ball-bearing technology to reduce friction within the turbo, allowing it to spin up faster. Combined with electronically actuated wastegates that can instantly adjust position regardless of system pressure, turbo-lag and response time are minimised. This – together with the power from the E-motor – gives the Artura extremely rapid response to throttle inputs.



A series of complex heat shields tightly surround the ‘hot vee’ to cool it efficiently. These enclose the engine to stop heat diffusing through the rear of the vehicle, with nozzles fed from the back of the high-temperature radiator (HTR) fans to blow air at high speed between the top of the ‘hot vee’ and the underside of the heat shield. This heated air is funnelled out through the powertrain chimney, an opening in the heat shield in the centre of the rear deck mesh.



The lightweight engine block, cylinder heads and pistons are all aluminium. The block has directly coated parent bores rather than separate coated liners. This technology allows the engine to be significantly shorter. The cylinder head and block utilise 3D printed cores, a technology more typically used in Formula 1™ than road cars, allowing uncompromised precision cooling, for example a micro-compact 2mm cooling passage between the cylinders.



Another innovation – this time benefitting refinement and packaging – is the location of the chain drive at the rear of the engine. This reduces NVH intrusion into the cabin, as well as torsional vibration. Overall, the new V6 produces very little mechanical noise, either from the engine itself or associated pump and valvetrain sounds. Intake noise has also been optimised for refinement.



The combination of enhanced refinement and instant driver engagement under throttle enables the Artura to fulfil its dual role as a vehicle that can be driven every day in normal urban traffic and an incredibly immersive supercar on road or track.



The advances in refinement have allowed McLaren to tailor a unique exhaust sound when the throttle is depressed. The delta between on- and off-throttle sound is the greatest of any McLaren to date, acknowledging the differing demands of the High-Performance Hybrid powertrain’s driving modes. This has been achieved through a number of routes, including the reduction in length of the exhaust system itself – the exhausts exit straight back from the ‘hot vee’, reducing weight and allowing for the creation of a full-width rear diffuser. The lightweight exhaust system has optimised resonators to enhance the Artura’s harmonic and full-bodied exhaust note.






All-new eight-speed transmission


    Newly designed and developed specifically for the Artura

    Lightweight and compact, with E-motor integrated within the clutch bell housing

    Short individual gear ratios optimise power/torque delivery and driver engagement

    No mechanical reverse gear – E-motor runs in reverse instead




“With eight forward gears, all with short individual ratios, the all-new, twin-clutch transmission encourages the driver to keep the V6 engine in the power and torque band for more of the time and fully enjoy the Artura driving experience. The transmission is lightweight and very compact, especially when you consider that it has the powertrain’s E-motor – which also fulfils the role of a mechanical reverse gear – integrated into the clutch bell housing.”



Geoff Grose, Chief Engineer, McLaren Artura




The McLaren Artura has a completely new and technically advanced eight-speed seamless-shift transmission. Designed to integrate the E-motor yet still be very compact, the technically advanced transmission offers high performance and significantly improved CO2 figures. Despite an extra gear over the seven-speed transmission on McLaren’s V8-powered vehicles, the length of the gear cluster has been reduced by 40mm, helped by use of a nested clutch rather than a parallel clutch.



The transmission acts to transfer torque from both the E-motor and the V6 engine. This allows the vehicle to operate in a zero-emissions mode using only the E-motor after the internal combustion engine is disconnected.



The use of eight gears allows the ratios to be more closely stacked, giving lightning fast gearshifts – close to 200 milliseconds – while twin clutches enable the continuous transfer of torque from the input to the driveshafts during each change of gear. The E-motor’s torque can also be utilised during gearshifts, particularly those at low vehicle speeds and low engine rpms, to smooth the transition from one ratio to the next. The eighth ratio is used as an overdrive to improve consumption characteristics on motorways.



Both electric and mechanical oil pumps feature; the electric pump is necessary whenever the engine is disconnected from the transmission, but it can also be used to supplement the mechanical pump which, as a result, is smaller than would otherwise be the case.



Cooling for the transmission is provided by two new medium-temperature radiators (MTR). A feed is taken from the high-temperature radiator (HTR) circuit and each MTR is fed by an air intake at the base of the roof buttresses, pre-cooling the water to enable clutch cooling to lower temperatures than the engine and transmission.




E-motor and battery pack



    Compact, high power density E-motor generates 95PS and up to 225Nm

    Five-module Lithium Ion energy dense battery

    Usable energy capacity of 7.4kwh; 30km of electric-only range




“The compact, high power density axial flux E-motor and energy dense Lithium Ion battery pack that comprise the electric element of the Artura powertrain bring 95PS and up to 225Nm to the total power and torque outputs of McLaren’s new High-Performance Hybrid. This contribution is key both to the electrifying supercar performance and the 30km of emissions-free, EV driving capability.”


Sunoj George, Head of Electric Drive Technology, McLaren Automotive




So much innovation has been concentrated into the compact dimensions of the all-new petrol V6 that it’s easy to overlook the other driving force inside McLaren’s High-Performance Hybrid powertrain – the electric motor and battery pack that comprise the electric element.



The E-motor is truly ground-breaking, being the first application of an axial flux motor in a series-production road vehicle.  Most E-motors in the automotive world use radial flux technology, where magnets are positioned around a rotor. An axial flux motor is fundamentally different, featuring a stator sandwiched between two rotor hubs and able to deliver exceptionally high power and torque density, while also being smaller and lighter.



The Artura’s E-motor weighs just 15.4kg including the transmission interface, which is less than half the weight of the 38kg radial flux E-motor in the McLaren P1™. It generates 95PS (94bhp/70kW) – a power output of 4.6kW/kg that is 33% higher in terms of power density than the unit in the McLaren P1™ – and maximum torque of 225Nm (166lb ft). The E-motor is capable in conjunction with the battery pack of propelling the Artura in pure EV mode for up to 30km, and to a maximum speed of 130km/h/81mph. The torque delivery profile of the E-motor is different to that of the V6 petrol engine; the peak of each does not occur simultaneously, hence the Artura’s 720Nm maximum overall.



The short axial length of the E-motor fits neatly inside the bell housing of the Artura’s bespoke eight-speed twin-clutch gearbox. By packaging the E-motor in line with the engine and transmission, its power and torque are transferred directly to the main transmission shaft, improving response. By contrast, with an offset radial flux motor, additional gearing is needed to transfer its outputs to the main transmission shaft. The E-motor also fulfils the role of a reverse gear by spinning backwards when required, meaning that there is no need for a reverse gear in the Artura’s transmission.



The Artura’s battery pack is another example of McLaren honing its hybrid expertise. Whereas both the McLaren P1™ and the Speedtail have ‘power batteries’ akin to those found in motorsport, the Artura features an ‘energy battery’ that enables both impressive acceleration performance and a practical 30km zero-emissions range when fully charged. Usable battery energy is 7.4kWh.



The battery pack consists of five lithium-ion modules, which sit on a cooling manifold. The battery management unit sits alongside the modules, and the power distribution unit (PDU) is integrated into the battery to save space. The battery is indirectly cooled via refrigerant in the cooling rails of the manifold; the refrigerant circuit runs from the front of the monocoque where the new electric heating, ventilation and air conditioning system is located. Optimised cooling of the battery delivers greater power and supports consistency of the zero-emissions range.



The entire battery assembly is enclosed within a fireproof cover and mounted on a structural carbon fibre floor that is bolted as one piece into the rear section of the carbon fibre monocoque. The floor, which features aluminium inserts and a structural foam core, provides crash protection below the battery pack. Protection from the side and above comes from a bespoke cavity engineered into the monocoque, shared with the fuel tank which sits above the battery. The engine, transmission and rear frame shield from any rear impact, meaning the battery pack is incredibly well protected. It is also located as low as possible in the vehicle, benefitting the Artura’s centre of gravity.



From the battery pack, a high-voltage DC supply runs to the integrated power unit (IPU) at the front of the car. It is a combined DC/DC converter, on-board charger and front power distribution unit, and the sharing of power electronics in this unit reduces weight. The DC/DC converter changes the high-voltage DC current from the battery to low-voltage DC current that is used in the vehicle’s 12v system. The electronics also convert AC taken from the plug-in vehicle charger to the DC that charges the battery.



Artura customers can maintain charge in the battery pack through the use of the engine, including via a ‘set charge to 100%’ function that prioritises using the internal combustion to recharge it, for instance ahead of entering an urban area. However, you can also plug in – a charge from zero to 80% takes around two and a half hours via a standard EVSE cable. The batteries can also harvest power from the combustion engine, with the driver able to influence this behaviour from the cockpit.



The battery is never allowed to completely discharge, thanks to a number of power reserve functions. These include a reserve to crank the engine on vehicle start-up, a reserve to power reverse ‘gear’ and a reserve for when the car remains parked for extended periods.



The power distribution unit located inside the battery gives its distribution to the state-of-the-art, super lightweight motor control unit (MCU), which converts the high-voltage DC current of the battery to the AC current that the E-motor needs under acceleration. As further evidence of the pace of development at McLaren, the MCU weighs around 68% less than the equivalent unit in the McLaren P1™.







Driving dynamics




“The Artura is super-lightweight, with the entire powertrain packaged centrally in the vehicle and as low down as possible. The rear suspension is a clever multi-link wishbone system that’s designed to be significantly stiffer than anything we’ve used before, and advanced Proactive Damping Control is also a central part of the car’s dynamics. We wanted to make a thrilling, engaging supercar that asks very few compromises of the driver or the passenger and the Artura truly delivers on the McLaren promise of class-leading driving dynamics and cutting-edge technology. “
Geoff Grose, Chief Engineer, McLaren Artura



The Artura’s engineering credentials are guaranteed to excite anyone who values incredible driving dynamics. The only supercar in its class to offer the combined attractions of super-lightweight carbon fibre construction, a mid-engined, rear-wheel drive configuration, the purity of electro-hydraulic steering, the instant torque of an E-motor (which helps to deliver throttle response that is twice as rapid as any non-hybrid McLaren) and the advanced handling benefits of an E-differential, the Artura has been designed to engage and delight in the way that only a McLaren can.



McLaren engineers have ensured that the Artura has two distinct characteristics that would ordinarily be diametrically opposed: increased agility and increased stability. This has been possible because of a combination of actions and innovations beyond the core advantage of a carbon fibre monocoque structure, notably a completely new rear suspension concept and McLaren’s first electronically controlled rear differential, which together allow the enjoyable accessibility of the car’s dynamic behaviour to be separated from its high-speed stability.



Chassis settings can be adjusted electronically with three Handling modes: Comfort, Sport and Track. Each setting has its own distinct set of parameters for the dampers, for example a compliant ride for urban driving when in Comfort mode or enhanced dynamic response through tighter damper control when in Track. The settings for the E-diff are also altered as the driver cycles through the Comfort, Sport and Track settings.



More experienced drivers can utilise the expertise of the Electronic Stability Control (ESC) system, where conditions allow. The ‘ESC On, ‘ESC Dynamic’ and ‘ESC Off’ settings are distinct from the Handling and Powertrain modes, offering the driver full control over the level of vehicle intervention available.



Along with throttle response, steering feel is the most immediate and pure connection between car and driver and the most tactile way to maximise driver engagement. McLaren has always favoured electro-hydraulic assistance over a fully electric steering set-up and has maintained this with the Artura, to best deliver the immediacy, on-centre feel and detailed feedback for the driver.



The Artura also features a new steering column. A fundamentally different design concept that enhances modal stiffness, the column is mounted directly onto a super-stiff, cross-car beam behind the facia. There is also a bespoke torsion bar in the steering rack to create a more nimble and agile dynamic experience, with a greater weight build up away from centre, and a more natural and unassisted feel.





Suspension




The McLaren Artura features an all-new, completely redesigned rear suspension. The upper link is a unique wishbone, but what would ordinarily be a lower wishbone has been split in two to become a multi-link component. Viewed from above, rather than connecting to the upright through one central joint, it now features two joints that are further apart. At the same time, the toe control arm has been positioned much further from the wheel hub than is usual, in an extreme location almost at the inner rim of the alloy wheel.



By splitting the wishbone and maximising the distance between the toe control arm and upright, there is a much greater separation between the connecting points. The result is significantly increased toe stiffness on the rear axle. Additionally, the large, forged uprights deliver stiffer camber, which allows load to be taken off the suspension links, in turn aiding weight reduction.



The lighter, more compact V6 engine and the geometry of the rear aluminium frame gave McLaren engineers greater freedom in choosing the inboard pick-up points of the suspension. The lower link points in particular are much further forward than is usual. By aggressively using the kinematics in this way, the weight of the rear suspension was able to be reduced by 2.4kg of unsprung mass on each side of the car, benefitting both ride and grip levels. The toe control arm is also located in front of the wheel, rather than behind it, moving the weight distribution towards the centre of the vehicle.



The result is a rear axle that is considerably stiffer around the z-axis, with stiffness of both camber and toe also significantly increased. This gives greater control under braking and acceleration, with stability improved overall across the board and grip levels during cornering enhanced.



The front suspension, which features dual aluminium wishbones, is similar to the system developed for the McLaren 600LT. This combination of lightweight uprights and double wishbones delivers enhanced steering and precise vehicle reactions, with faster responses to driver inputs and heightened feel.



Grip is enhanced by continuously variable, twin-valve hydraulic dampers that feature individual compression and rebound characteristics. Single-stiffness springs and mechanical anti-roll bars are used, in combination with a new iteration of McLaren’s Proactive Damping Control system. Developed from the technology pioneered on the McLaren GT, PDC II is the most sophisticated example yet of the Optimal Control Theory software algorithm first developed for the 720S.



The Proactive Damping Control system uses inputs from sensors to ‘read’ the road rather than reacting to camera-based information. Feedback from four wheel accelerometers, three body accelerometers and two pressure sensors per damper – as well as multiple sensors that measure steering angle, vehicle speed, yaw rate and lateral acceleration – is processed in less than two milliseconds to ensure the vehicle state is optimised for outstanding levels of control.



As acceleration, braking and cornering continually alter, and the road surface constantly changes, so Proactive Damping Control interprets data and uses its digital models to predict the perfect damping response. The regulation of the body’s movement is tailored for occupant comfort, but the vertical load and contact patch variation is optimised to enhance grip levels by ensuring each tyre remains more consistently in touch with the road surface.






E-differential



The Artura is the first McLaren to have an electronically controlled differential (E-diff). Smaller and lighter than a mechanical locking differential, the E-diff is integrated into the all-new eight-speed transmission, optimising packaging and weight.



The adoption of an E-diff brings the enhanced levels of control required to manage torque moving across the rear axle of the Artura, with the immediacy needed to respond to the instant delivery by the E-motor. A mechanical differential would not be able to react with sufficient speed or precision to ensure the behaviour of the car is always proportional to throttle inputs.



The calibration and tuning of the E-diff encompasses values including corner radius, vehicle speed, damping characteristics and torque split across the differential. This in turn allows levels of understeer and oversteer to be precisely calculated and controlled, constantly fine-tuning the Artura’s agility/stability attitude to benefit a driver drifting the car on a track or controlling yaw gain with the throttle. Traction when coming out of corners is also enhanced by the closer control parameters.



The Artura also features McLaren’s innovative Variable Drift Control (VDC), which allows the driver to adjust the level of traction control assistance – and therefore the limit of oversteer – using a slider control on the Central Infotainment Screen.







Braking


The brakes on the Artura are the latest-generation carbon ceramic brakes and lightweight aluminium calipers from the same family as the system used in the McLaren 600LT and 720S. The carbon ceramic discs measure 390mm at the front and 380mm at the rear and, working in conjunction with the kinematics of the new rear axle design, deliver superior high-speed braking power and stability.



In addition to the discs and forged aluminium calipers (6-piston front monobloc, 4-piston rear), the Artura adopts a version of the Formula 1-inspired integrated caliper cooling ducts seen on the 765LT. This technology delivers cooling air to the front calipers and discs, reducing brake pad temperatures during track driving.



The McLaren Artura features a bespoke brake booster and electrically driven vacuum pump, to ensure pedal pressures remain consistent whether the car is running on its internal combustion engine or electric power alone. There is no function to regenerate the battery through the vehicle’s braking system because the engine can provide sufficient charging, and this ensures feel through the brake pedal is entirely consistent.





Tyres



McLaren’s tyre partner, Pirelli, has delivered three bespoke tyres designed to maximise the Artura’s dynamic characteristics and performance. The tyres - 235/35Z R19 at the front and 295/35 R20 at the rear – are all marked ‘MC-C’ to indicate they are a Pirelli Cyber Tyre® tailor-made for McLaren.



The P ZERO™ tyre fitted as standard features an asymmetric tread pattern that improves braking and enhances handling and control across a wide range of road conditions, with particular focus on wet weather performance. The compound developed for the Artura ensures maximum grip and stability, while the structural integrity of the tyre improves steering response.



Two optional tyres are available. The P ZERO™ CORSA tyre is designed for use on both road and track and features racing-type compounds and unique tread patterns, achieving higher grip levels as well as improved braking and traction.  The P ZERO™ WINTER is the tyre of choice for winter, its bespoke compound and tread pattern maintaining the levels of control of the P ZERO™ summer tyre.



The Artura also features the innovative Pirelli Cyber Tyre® system. Consisting of hardware and software integrated into the vehicle electronics, the system has an electronic ‘chip’ in each tyre and generates a stream of high-value data based on tyre specific conditions that is relayed to the control systems of the Artura to deliver the best tyre performance.



Able to recognise whether a P ZERO™, P ZERO™ CORSA or P ZERO™ WINTER is fitted, Pirelli Cyber Tyre® produces accurate, real-time monitoring of temperature and pressure and a broader data set than a wheel rim sensor. With this information, drivers can set tyres to the recommended levels to optimise performance; a ‘park mode’ refreshes the information when the driver returns to the car.



Additionally, by using a ‘track mode’, tyre pressure thresholds can be changed on the infotainment display to a performance configuration that further enhances circuit driving enjoyment.





Driver assistance systems



The Artura is the first McLaren to offer Advanced Driver Assistance Systems (ADAS). These extend to Intelligent Adaptive Cruise Control with Stop/Go, Road-Sign Recognition, Lane-Departure Warning and High-Beam Assist. Intelligent ACC automatically decreases or increases the speed of the Artura to keep pace with the car in front, including in stop-start traffic conditions, with the driver able to set the distance between the vehicles. Additionally, the speed limit, which is recognised by a front-facing camera, is displayed on the digital screen and prompt the driver to adjust the cruise control.



The Lane-Departure Warning system is designed to warn the Artura driver when the vehicle begins to move out of its lane. High-Beam Assist recognises oncoming vehicles at night, switching the Static Adaptive Headlights between main and dipped beam automatically. This enhances night driving by better illuminating the road ahead while removing the need for the driver to manually adjust the headlights.






Piers Scott- photos McLaren

Permanent-URL: http://www.automobilsport.com/mclaren-artura-detail---219376.html

17.02.2021 / MaP

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