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Smaller, less pricey follow-up to the SLS reveals its true capabilities

The last time Mercedes-AMG was tasked with building a model from scratch, it went to town.

Not only did the SLS evoke the 300SL with its gullwing doors, but it also housed the M159 engine in its long nose, a reworking of AMG’s own V8 and the last naturally aspirated engine to feature in a Mercedes.

Whereas the SLS was a supercar in the mega-GT mould, AMG’s follow-up is smaller, cheaper, turbocharged and conventionally doored

It was, in many respects, marvellous – and because it was AMG’s first go, momentous, too. Its replacement, although similar in some respects and not entirely unrelated beneath, is not to be thought of as a successor.

Whereas the SLS was a supercar in the mega-GT mould, AMG’s follow-up is smaller, cheaper, turbocharged and conventionally doored. It’s a two-seat sports car, says Mercedes, which means that the manufacturer is less interested this time around in making a splash and more concerned with stealing customers from under the noses of Audi and Porsche.

That’s considerably more difficult than building a low-volume supercar, particularly as Mercedes has stuck with the SLS’s gameplan: keeping its big engine in front of the driver rather than behind, nestling the cabin to the rear of a long-nosed body and even providing a decent boot, this time with a convenient liftback.

It is also comparatively large and not tremendously lightweight. But it is beautiful and available as a Roadster. It’s also still powered by a hand-built V8 – AMG’s newly developed biturbo unit, producing 469bhp in the standard car and 514bhp in the more expensive and more popular S model tested. Heading the coupé range is the 577bhp R which aims to take the fight directly to McLaren and its fabulous 570S. As for the Roadster range - the standard GT uses the same 469bhp engine as the coupé, while the range-topping C has 549bhp at its disposal.

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As in the SLS, the power goes to the rear wheels via a transaxle, which helps to keep the weight distribution at what Mercedes calls an optimum 47/53 percent front-rear split. The V8 itself is mounted sufficiently far back on the aluminium spaceframe that the manufacturer prefers to describe it as front mid-engined.

In point of fact, it describes the GT as a lot of things, most notably the embodiment of the “spirit of the glorious Mercedes sports cars”. That it may be, but is it sufficiently good to outshine the Porsche 911 Carrera or new Audi R8?

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DESIGN & STYLING

Mercedes-AMG GT S rear

The SLS, were you lucky enough to encounter one, tended to make an impression. As Teutonic as the Bismarck and not a whole lot smaller, the gullwing-doored attention-getter had a way of commanding your gaze without ever entirely satisfying it.

The GT redresses that balance. The proportions are similar, but it comes with a curvier body. It’s shorter by 92mm and, from more than one angle, sensationally appealing. Not every tester appreciated the flagrantly pinched rear quarters, but admiration for the GT’s stylish image was virtually universal.

The absence of top-heavy gullwings contributes to the lowering of the GT’s centre of gravity

There are those, perhaps, who will miss the SLS’s extravagant method of entry and exit, but besides cost, the doors are conventionally hinged for a good reason: the absence of top-heavy gullwings contributes to the lowering of the GT’s centre of gravity.

The mostly aluminium underbody weighs just 231kg, with Mercedes claiming exceptional rigidity from a spaceframe derived from the SLS. The new engine, though, has more in common with the turbocharged four-cylinder unit found in the A45 AMG than the departed M159 motor.

Designated the M178, the V8 has the same bore and stroke as its smaller sibling and uses similar technology to retain a high-revving character. Its two turbochargers are mounted within the cylinders’ vee configuration, an arrangement that allows optimum response and, just as important, keeps the engine physically compact.

This is necessary because despite the available acreage, the V8’s ideal position is well aft of the front axle. Similarly, the new motor is lubricated via a dry sump – useful for high lateral loads but also necessary for mounting the lump as low to the ground as possible.

AMG’s devotion to dynamic balance continues in the rearward location of the transmission. The seven-speed Speedshift DCT – familiar but fettled for faster shifts in the GT – is assimilated into a transaxle that also includes a locking differential, electronic in the S version tested here and mechanical in the standard model.

The SLS was packaged thus, and together with a steel tailgate and magnesium front deck, this is a key reason for the GT’s rear-biased weight distribution.

Like its predecessor, the new model’s chassis also gets the purist-preferred double wishbones all round. The hub carriers, steering knuckles and wishbones are forged aluminium to reduce unsprung mass, and the three-stage adaptive dampers are electronically managed via AMG’s Ride Control.

The drivetrain, including the transaxle, is damped, too, although an optional Dynamic Plus Pack enhances this system with dynamic mounts.

Similarly, the standard-fit composite brake system, can be uprated to a carbon-ceramic alternative, as on our test car

INTERIOR

Mercedes-AMG GT S interior

The disposal of the SLS’s gullwing doors perhaps ought to have made the GT an easier car to get in and out of.

In practice, it hasn’t made much difference. But the act of lowering yourself, dangling your backside over a sill wide and high enough to sit on, and then levering your legs up under your chin to squeeze your feet past the unusually close A-pillars doesn’t irk much. It really only increases the anticipation you feel in the build-up to thumbing that large starter button.

The boot is wide and fairly long - but shallow. GT owners will learn pretty quickly to pack for the weekend in soft, squidgy bags, I suspect

Credit to AMG, while we’re on the subject, for doing a sufficiently thorough job of the right-hand drive conversion that the starter button has been moved to the driver’s side of the transmission tunnel console.

That centre console seems to have risen and swollen from normal proportions like some shiny metallic soufflé, but it could hardly feel more solid.

It’s dominated by eight buttons and knobs, all of them tactile and well labelled but sufficiently oversized that they wouldn’t look out of place on a toddler’s pedal car. Bigger is better in most things in the GT’s world. So it’s odd that the tiddly gear selector lever feels undernourished in your hand and is sited too far aft for optimum convenience.

The cabin design occasionally favours dramatic effect over usability, which is probably as it should be. The hazard warning toggle button is located on a roof console, making you feel like a fighter pilot as you come in to land on the hard shoulder. The analogue speedometer, meanwhile, is sufficiently heroically scaled and hard to read that the digital repeater is an absolute necessity.

But the GT has a rich-feeling and well-constructed cockpit that looks and feels exciting, eccentric and of distinguishing material quality.

It’s accessible and practical enough to use every day – thanks in no small part to a good-sized boot accessed by a liftback rear. And perhaps most important, it whets your appetite very nicely for what’s to come.

As for standard equipment both the coupé and roadster versions of the GT come with 19in alloy wheels, an AMG crafted bodykit, a performance exhaust system, an electrically extending rear spoiler and Mercede's active front air intake system as standard on the outside. On the inside, there is heated sports seats, a nappa leather upholstery, climate control and Mercedes-Benz Comand infotainment system complete with an 8.4in display, a built-in hard drive, DAB radio, sat nav, Bluetooth and the ability to integrate your smartphone to the GT to record your lap times or video the laps themselves. The Roadster also gains a cloth soft top, a wind deflector and Mercedes' Air Scarf system.

The GT S rolls on 19s on the front and 20s at the rear and gets additional chrome trim included in the package, while the GT C gets parking sensors, a reversing camera, keyless entry and go and a Burmester sound system as standard.

ENGINES & PERFORMANCE

Mercedes-AMG GT S side profile

If you didn’t already know as much, it takes barely a moment’s rotation of the GT’s forged crankshaft to make you realise you’re not about to experience a typical modern sporting drive.

The engine’s woofling, deep soundtrack is lavish and enticing. At times it sounds like a powerboat gargling gently out of dock, at others like an angry Welsh baritone in a rugby crowd.

The car is ready and raring from low revs and still pulling hard above 6000rpm, with the redline not intervening until 7000rpm

Either way, that delicious, varied tonality is the first major clue that this long-nosed two-seater is no ordinary super-sports car. Rather, it’s a complex, occasionally flawed but always enigmatic mix of out-and-out dynamic thriller, sporting throwback, hot rod muscle car, track-day special and grand touring coupé – all rolled into one.

Getting a permanent hit of charisma from that V8 is, you soon realise, an absolute must – and that means activating the bi-modal exhaust’s Sport mode whenever possible. It is misguided to imagine that deactivating it makes the GT’s cabin any quieter when you’re cruising. The vast majority of the noise filtered in (and there’s plenty) stems from the suspension and tyres.

The car’s raw speed is considerable but perhaps not the outstanding selling point, among £120,000 sports cars, that AMG would have you believe. Just as the likes of the Porsche 911 Turbo S, new Audi R8 V10 Plus and even the latest Nissan GT-R offer more headline power than the GT, so, too, will they accelerate at a rate that the AMG has no answer for.

There again, where classic front-engined, rear-driven competition is concerned, neither a Jaguar F-Type R Coupé nor an Aston Martin V12 Vantage S will match the GT S until well into three-figure speeds.

That the car feels blisteringly fast is, of course, assured. Throttle response is good enough that you seldom notice any lag at all, and the car is ready and raring from low revs and still pulling hard above 6000rpm, with the redline not intervening until 7000rpm. AMG’s launch control system works well – something you couldn’t say of the SLS’s equivalent – and its brakes are toweringly powerful.

The one caveat with the brakes is that pedal feel with the optional carbon-ceramics still isn’t brilliant. 

RIDE & HANDLING

Mercedes-AMG GT S cornering

The SLS wasn’t the best-handling sports car of its type, and the GT S isn’t, either. But both cars were created very much in the same highly strung, harum-scarum vein, their rationale being: “If you can’t beat ’em, you’d better leave a lasting impression.” And the GT does that.

Its handling is unapologetically and uncompromisingly flat, firm, grippy and direct. The car cleaves into corners with a keenness that’s rare even among its sports car rivals.

I find it hard to believe, but AMG offers an even stiffer suspension tune than our test car's

It disdains body roll – or any kind of lost directional energy or momentum, really – and its remarkable agility comes as much from its razor-sharp cornering balance as its outright lateral grip or the gearing of its steering.

Driving this car quickly on the road means peeling your eyelids back and dialling your concentration levels up to 11. That hyper-responsive wheel offers just enough feedback at the straight-ahead to keep the car from feeling nervous on the road, although it doesn’t escape by much.

And yet both off and on-centre, the steering is in serious need of greater confidence-inspiring weight and feedback. The firm springing makes the helm react to every medium-sized bump that the front wheels cross, and this, on a really testing B-road, can challenge your capacity to guide the car smoothly and with total precision. Want exciting? You’ve found it all right.

The ride is short and staccato. It’s slightly less aggressive when the softer damping modes are selected, but no less busy. Long-wave undulations hardly disturb the level of the body at all, but when the road’s topography turns particularly savage, the suspension often becomes skittish, as tyres part company with the road surface and impacts thump through that spaceframe chassis.

This isn’t a refined car. In fact, it’s perhaps the least refined in a segment increasingly preoccupied with everyday usability. Despite the lightness of its controls, it isn’t easy to drive, either – and it’s certainly no delicate flower.

It’s old-school and route one but, on the right road, also wildly dramatic and enthralling. Whether you can live with it the rest of the time is up to you.

MPG & RUNNING COSTS

Mercedes-AMG GT S

The closer you get to £100k, the less meaningful four or even five-figure differences between list prices become.

For the record, the GT starts at around the same money as a Porsche 911 GTS – a car roughly comparable in performance and efficiency (both claiming combined fuel economy of about 30mpg that you’d struggle to replicate in the real world).

Some of the toys mentioned - AMG Ride Control, electronic differential lock, Race mode - are exclusive to the S and help account for its £14,000 premium

At around £135k, a new Audi R8 V10 Plus appears to cost significantly more, but then our test car got close to that when brought up to a similar spec. Bookending this car’s British-based competition are the Jaguar F-Type R Coupé and the McLaren 540C.

The GT S eclipses the GT in sales volume, too. Some of the toys mentioned – AMG Ride Control, electronic differential lock, Race mode – are exclusive to the S and help to account for its £13,300 premium.

Cutting the roof off of a car invaribly comes with a price hike, understandly, with the GT Roadster costing £11,000 more than the coupé and the GT C, £27,000 more than the GT S. While the GT R sits on its own breaching the £143,000 mark, but crucially Mercedes-AMG won't be limiting production of their range-topping GT.

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VERDICT

Mercedes-AMG GT S rear quarter

With the body structure of a supercar, an engine from a muscle saloon, suspension tuned for maximum attack on the track and yet the practicality and sophistication of an elegant coupé, or roadster, the GT is an even more bewildering addition to the sports car world than the Mercedes-Benz SLS was.

It’s a wonderful addition, though – and a gleefully exciting and expressive one, with its heart not so much worn on its sleeve as riveted to its forehead.

There would be times when you’d grow tired of its high-adrenalin temperament and lack of civility, but the highs would outweigh those occasions

Superbly dramatic performance and handling would make driving this car a truly box-office event every day. There would be times when you’d grow tired of its high-adrenalin temperament and lack of civility, sure, but the highs would outweigh those occasions.

It’s capable of involvement more vivid than some supercars at twice the price. We wish it had greater fluency and delicacy, but owning one would make life in a Porsche 911 Turbo, or any number of its imitators, seem tame. Especially if you opt for one where the roof can be collapsed.

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Mercedes-AMG GT First drives