GMA T.50: A detailed analysis


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The Gordon Murray Automotive T.50’s intensive development period is almost complete, here’s everything you need to know about Murray’s F1 successor.

The Gordon Murray Automotive T.50 is nearing the end of its intensive development process, having run development prototypes both on road and public in displays like the Goodwood Festival of Speed and Members Meeting.

As part of the T.50’s comprehensive development schedule, multiple VP or validation prototype cars are now up and running, with VP5 seen at the 2022 FoS virtually up to production-spec. Its powertrain is now up to full working order, with the VP cars running up the hill at full pace over the course of the weekend.

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While the T.50 is not being engineered to be a numbers car, its key figures are quite something thanks to an absolute focus on GMA’s fundamental development criteria such as performance through lightweighting and innovation by design. As a result, the T.50 has successfully hit its target kerb weight of 986kg, an incredible achievement given the three-seater layout and V12 powertrain.

The bespoke V12 power unit itself has been designed in collaboration between Cosworth and GMA, and produces 488kW at 11,500rpm and 468Nm of torque arriving at 9000rpm, connected to a six-speed manual transmission powering the rear wheels.

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Of course the T.50’s most advanced element is its aerodynamic package, dominated by the rear-mounted fan that facilitates F1-style ground-effects that gives it immense downforce without the need for drag-incurring wings.

The T.50 really is the next step of supercar design and engineering, building on a foundation developed by Professor Murray in the McLaren F1, its path has been forged with a no-expense-spared mentality that goes some way to explain its £2.36m (AUD$4.2m) price tag.

GMA T.50 – the development story

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The combination of almost limitless creative freedom and Murray’s technical brilliance is a potent one, and with government regulation closing in on high-speed performance cars such as this, it could well be the last of its kind – the last analogue supercar.

The T.50 itself is a totally bespoke, money-no-object machine designed to appeal to the driver above all; no compromise, no platform sharing, no turbocharging, no automatic gearbox.

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It’s underpinned by a carbonfibre chassis, has a central-seat layout, is powered by a naturally aspirated V12 engine, and transmits its power to the road via the rear wheels only, but it mixes these conspicuously simple ingredients with technological advancements gathered in the preceding 28 years to create Murray’s present-day interpretation of the ‘perfect driver’s car’. It could well be the best driver’s car ever. This is why.

Chassis and lightweighting

The T.50’s carbonfibre monocoque chassis and body panels collectively weigh less than 150kg – an astonishingly low figure considering the safety regulations that must be adhered to in 2022. The cabin is laid out in a three-seater configuration, with each of the three seats also constructed from carbon. The driver’s seat weighs in at a scant 7kg, with each of the passenger seats even less at 3kg.

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While carbonfibre was also used on the McLaren F1, Murray admits that it was an early experimental application of the material in a road car, based on his experience in Formula 1. The T.50 benefits from 30 years’ worth of development in carbonfibre, enabling its chassis to be 20-30kg lighter than the F1’s, yet twice as stiff and more commodious inside.

Every component has been targeted in the name of saving weight. The pedal box, for example, comes in 300 grams lighter than the F1’s, while the super-thin windscreen is 28 per cent lighter than typical automotive glass applications.

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Dimensionally the T.50 has an incredibly compact footprint: it’s shorter and lower than a Porsche Cayman, and only 40mm wider despite its V12 engine, complex aero and three-seat cabin. The result of these modest dimensions and the accompanying lightweighting is a quite astonishing kerb weight figure of just 987kg, fluids included.

Powertrain details

The T.50’s V12 engine is completely bespoke, and has been designed between Murray and Cosworth to a very specific set of goals in construction, capability and design. The 3994cc motor features a 65-degree cylinder-bank angle, with an 81.5mm bore and 63.8mm stroke. It is naturally aspirated, runs at a 14:1 compression ratio, and has been designed for ultimate response as much as its power figure.

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Peak power of 488kW arrives at 11,500rpm, with the 467Nm  torque peak at 9000rpm. The V12 has a power density of 122kW per litre, meaning it outperforms the 115kW per litre of the Aston Martin Valkyrie’s 745kW, 6.5-litre engine – another naturally aspirated V12 designed and constructed by Cosworth, although GMA insists not a single component is shared between the two.

The maximum engine speed is 12,100rpm – a record for a production car. But even more astonishing is its rev-gain rate, the V12 capable of rising a stunning 28,500rpm per second. This is nearly three times faster than the BMW S70/2 V12 in the McLaren F1, and means the T.50’s engine is capable of hitting its rev limiter from idle in just 0.3sec. To achieve this, the internal moving parts have been shorn of as much weight as possible: the steel crank is just 13kg, and the connecting rods and valves are titanium, all to reduce rotational mass.

This contributes towards the V12’s incredibly low overall weight figure of 178kg – a record for a V12 road car engine, and 28kg less than the aforementioned Valkyrie V12. The crank is also only 80mm from the engine base, lowering all the engine’s internals to the benefit of weight distribution. Internal engine lubrication is by a dry sump system, naturally.

Almost obsessive measures have been taken in all factors of the powertrain’s ancillaries, too. There are no belts on the V12 – everything is gear-driven – while a 48V mild-hybrid system that employs an integrated starter motor and generator streamlines the electrical side of things. The V12’s ancillaries are situated out of sight, meaning only the headers, exhaust manifolds and intake plenum and trumpets are visible through the car’s glazed engine cover.

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The V12’s intake is fed via a roof-mounted ram-air scoop that borrows Direct Path Induction Sound tech first seen on the McLaren F1. The system essentially amplifies the intake sound from the roof scoop into the cabin, but runs on the basis of throttle position rather than engine speed, keeping the relative noise down when the driver lifts, while ensuring a more intense sound under big throttle applications at lower revs.

The six-speed manual gearbox is another bespoke commission, this time designed and built by Xtrac. It weights just 80.5kg, which – you’ve guessed it – is another road-car record. The shift feel is being painstakingly perfected by Murray himself with a short-throw movement on the compact gearlever that sprouts from the right-hand side of the central driver’s seat.

Airflow management

The GMA T.50’s unique aerodynamic package includes developments of features from Gordon Murray’s Formula 1 cars as well as modern-day F1 and road cars.

Dominating the package is a rear-mounted 400mm fan, which can accelerate the air passing under the car and out of the rear diffuser to increase downforce. The fan works in conjunction with a selection of movable aero devices in the T.50’s underfloor, inside the rear diffuser and at the trailing edge of the car’s rear end. The underfloor ducting, together with the fan’s unique design, does away with the need for the ‘skirt’ found on the Murray-designed Brabham BT46B ‘fan car’ of the late 1970s. The fan also doubles as a cooling aid for the mid-mounted V12 when required.

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The T.50 has a total of six different aero modes, two of which are automatically engaged without driver intervention, and the other four being selectable. Auto Mode is the default, and enables the system to respond variably to driver inputs, while a Braking Mode then activates under heavy braking, lifting the aerofoils and operating the fan at high speed, doubling downforce and therefore enhancing the tyres’ purchase on the road surface for the most effective braking performance.

The four further modes include High Downforce Mode for fast road or track driving. This activates the fan and aerofoils to improve traction and high-speed cornering grip by raising downforce by 30 per cent over the default mode. Streamline Mode, meanwhile, reduces drag over the default mode by ten per cent for high- and low-speed cruising, and closes all the underbody ducts and activates the fan at high speeds to extend the trailing wake of air behind the car, in effect creating a virtual long-tail.

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Vmax Mode shares this slipperiest of set-ups with Streamline Mode, but adds almost 50bhp of electrical power from the integrated starter-generator for up to three minutes, raising peak power to around the 520kW mark.

To validate these modes, GMA partnered with the Racing Point Formula One team to utilise its rolling-road wind tunnel at Silverstone. The first quarter of 2020 also saw the opening of the Gordon Murray Automotive customer experience and service centre at Dunsfold Park in Surrey, alongside the company’s headquarters and manufacturing facility, which will commence building cars in January 2022.

Design and interior

As with so many other elements of the T.50, it’s impossible not to draw parallels between the new car and the McLaren F1. Their shared DNA is obvious in the design, with similar proportions underpinning an aesthetic that’s more complex and contemporary on the T.50 than its ’90s predecessor.

The roof-mounted ram intake means that large-scale air intakes are not required in the body sides, affording them a simplicity not seen on rivals such as the Valkyrie or contemporary McLarens. The canopy-like cabin has a similarly ‘glassy’ feel to the F1’s and can be enhanced with optional glazed sections in the tops of the butterfly doors. The side windows are once again sectioned, but there are no rear windows this time, rearward visibility being handled solely by cameras, the images from which are displayed on screens either side of the cockpit. For this reason, there are no door mirrors either.

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Any complexity to the T.50’s design is almost exclusively saved for the rear-end, which needed to integrate the fan, underbody diffuser, cooling, lighting and exhaust outlets in a relatively compact space. While the F1 shared its rear lights with an Iveco truck, the T.50’s LED units are bespoke and, as you’d expect, lightweight.

The car’s central-seat layout has largely driven the interior architecture, but the interfaces and controls are pure Murray. The steering wheel is free of cluttering controls, while touchscreens are notable by their absence; instead the driver interacts with the car via six milled control knobs flanking the instrument cluster. The centrally positioned rev counter is analogue (seems Lexus’s claim that the LFA required a digital rev counter to keep pace with its fast-revving V10 may have been a rare case of Japanese adornment), while either side are digital displays splitting driver info and infotainment/navigation.

The manual transmission lever sprouts to the driver’s right on a cantilevered carbon and aluminium structure that also exposes the lever’s movement underneath.

The buyers

A total of 100 T.50s will be built, commencing later this year and priced from £2.36m (AUD$4.2m). Given the McLaren F1’s reputation, it’s not surprising to hear that the majority of the build run has already been allocated, with a strong reception from Japan and the US.

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