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  McLaren Senna GTR

  Article Image gallery (21) Specifications  
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Country of origin:Great Britain
Produced in:2019
Numbers built:75 (Limited Production)
Introduced at:2018 Geneva Motor Show
Price new:£1,100,000
Internal name:P15
Source:Company press release
Last updated:March 11, 2019
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Click here to download printer friendly versionThe McLaren Senna GTR is powered by the most extreme version yet of McLaren's 4.0-litre twin turbocharged V8 engine. The M840TR unit, with electronically controlled twin-scroll turbochargers, produces 825PS (814bhp) with 800Nm (590lb ft) of torque. The extra 25PS over the engine in the McLaren Senna has been achieved by engine control recalibration and removing the secondary catalyst to reduce back pressure. Removing the catalyst also heightens the aural experience of driving the McLaren Senna GTR.

The exhaust system of the concept, which exited through side pipes just ahead of the rear wheels, has been replaced with a more conventional rear exit system on the production car, with the pipes now emerging from the rear deck under the rear wing in the same location as the Senna. The change was made for the purest of engineering reasons: the side exit pipes may have looked the part, but the rear exit pipes provided the shortest, quickest route for exhaust gases to exit, saving weight and reducing complexity.

With 825PS and a lightest dry weight of 1,188kg, the 694PS-per tonne power-to-weight ratio of the McLaren Senna GTR comfortably exceeds not only that of 'regular' McLaren Senna, but every other McLaren Automotive car for road or track currently in production.

Three powertrain modes are available to the McLaren Senna GTR driver: Wet, Track and Race. The new Wet setting, which provides greater support from the ESP and ABS electronic systems, is particularly intended for use with wet tyres. The transmission, which includes a Launch Control function, is the same, acclaimed 7-speed plus reverse Seamless Shift Gearbox (SSG) that features in the road-legal McLaren Senna.

Optimising aerodynamic efficiency and giving even more extreme track focus than that possessed by the McLaren Senna - a car already designed to excel on the track - called for a holistic approach that subjected all aerodynamic aspects to intense scrutiny. The McLaren Senna GTR Concept showed the direction and the production-ready car now stands ready to deliver the most effective aero performance for track driving of any McLaren Automotive product.

The McLaren Senna GTR generates astonishing levels of downforce, peaking at more than 1,000kg, a significant increase over the 800kg developed by the road-legal McLaren Senna at 250km/h (155mph). Crucially, a completely different downforce 'curve' means the McLaren Senna GTR can call on an equivalent amount of downforce to the McLaren Senna at 15% lower vehicle speed, while still benefitting from reduced drag. The aero package of the McLaren Senna GTR delivers positive effects in high-speed corners but also in low-speed curves and under braking, making the car even less pitch- sensitive and enhancing stability in all situations.

The front splitter has been reprofiled and the rear diffuser reduced in size compared to the components on the 2018 GTR Concept, to optimise performance and meet the required track performance standards. Other changes in comparison to the Concept include new dive planes on the front corners and vortex generators either side of the car to ensure a stable airflow underneath; overall, the aero elements of the McLaren Senna GTR work together to deliver balanced downforce front-to-rear over the entire speed range.

The new front splitter features a raised centre section to feed air under the car back to the newly reprofiled diffuser. The efficiency of the diffuser has, in turn, been optimised by the new rear wing - a design featuring LMP1-style endplates that connect wing to body in dramatic fashion and are a highly effective way to guide air around the back of the car.

Compared to the standard McLaren Senna wing fitted to the 2018 GTR Concept, the wing of the McLaren Senna GTR has been reprofiled and relocated, having been pushed backwards so its trailing edge is now outside the car's footprint. This new, 'free of road car restrictions' position allows the wing to be coupled to the diffuser, making best use of the air flowing over the rear of the car.

Like the road-legal McLaren Senna, the McLaren Senna GTR features active aerodynamics in the shape of the active aero blades flanking the Low Temperature Radiator and an articulated rear wing - elements that are not currently permitted in GT3 racing but bring significant aero advantages. The wing can be 'stalled' for maximum speed thanks to an automatic drag reduction system (DRS).

The McLaren Senna GTR takes McLaren's mastery of carbon-fibre to a new level of accomplishment for a McLaren track car, combining light weight with immense structural rigidity. One of the lightest cars that McLaren Automotive has ever produced, the McLaren Senna GTR tips the scales in lightest dry guise at 1,188kg.

At the core of the McLaren Senna GTR is a McLaren Monocage III-R central structure, a carbon-fibre safety cell with integrated roll cage and uniquely, integrated harness mounting points. Like the road-going McLaren Senna, there is an aluminium front subframe and aluminium engine frame, with composite crash beams front and rear. The extreme, racing-inspired nature of the carbon-composite body appears more purposeful than ever, clothing a chassis that is wider still than that of the Senna and lower than the road-legal Senna by 34mm, at 1,195mm in height. Front track has increased - by 77 mm to 1,731mm - and rear track is wider by 68 mm, at 1,686 mm.

The wider fenders, accommodating 19-inch centre-lock wheels, exaggerate the relative narrowness of the cabin and 'ground' the car even more securely. Additional aero devices have been added to the door skins to optimise airflow from the revised fenders.

The McLaren Senna GTR is 10kg lighter than even the McLaren Senna, already a paragon of race-bred leanness. And this is despite the track car's wider track, extended body and the fitment of essential track equipment including pneumatic air jacks, pit radio, fire extinguishing system and data logger. Many of the creature comforts fitted to the McLaren Senna have been deleted for the McLaren Senna GTR, including touch screens and the audio system. To optimise comfort across the whole range of track conditions, air-conditioning has been retained.

The windscreen and side windows, with sliding ticket opening, are polycarbonate. The soft-close dihedral doors are fitted with a manual release mechanism, and the fuel filler has become a race-style dump-churn type. Exterior visual carbon-fibre aero elements have a gloss finish as standard. Wheel finish can be Gloss Black, Race Silver or Matt Dark Graphite and the colour of the door struts and brake calipers can be specified in Azura blue, red or McLaren Orange at no additional cost.

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  Article Image gallery (21) Specifications