Steering, suspension and comfort

AMG has derived a kind of magic from its blending of four-wheel drive, four-wheel steering, torque vectoring and chassis electronics in this car. The GT63 is not as nimble as the two-seat Mercedes-AMG GT but this really is the sweeter car of the two to drive and seems more within itself and in command of its capacities at any speed.

Although the suspension is switchable through three levels of firmness, they’re closely grouped and the fundamental set-up is juicily pliant. At the same time, there is a telling absence of roll or pitch for a car of such mighty dimensions, and what movements do occur are closely and quickly checked.

AMG’s e-diff enables plenty of handling adjustability in the wet, but also makes the car take attitude quite suddenly

This provides a solid base for the steering – quickly geared, at just 1.8 turns lock to lock, and well weighted – to operate at its best. It alters the car’s course swiftly but with a natural feel and without any nervousness off centre. Undoubtedly, the four-wheel steering helps to keep the car on line at times, although you’d never know a process so sophisticated was operating behind the scenes.

Off-camber crests barely trouble this chassis, and with the suspension in Comfort and the powertrain fully dialled up, it will carve securely along all but the smallest B-roads. Very few cars this size impart such confidence.

It’s a confidence that will, soon enough, have more experienced drivers going deeper into corners and harder out of them. Indeed, the GT63 is a difficult car to over-drive because it generates tremendous grip and traction, communicates its limits superbly and is inclined to oversteer neatly and predictably when those limits are breached and its driver aids deactivated. It exhibits the handling adjustability of a considerably lighter, simpler car and its mass seems to sit palpably closer to the road than in any of the traditional super-saloon cohort. The upshot is a drive as scintillating as it is benign.

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You would expect any AMG to acquit itself at least reasonably well on track, and although it is hardly a track-day car, so it proved when the GT63 took to the Dunlop circuit at MIRA. In fact, the lap time this car set was right up there with far more serious machinery and it comfortably outpaced the Bentley Continental GT we tested in almost identical conditions last year.

The AMG’s cast-iron brakes did wilt after just three rounds, with the car’s road-spec Michelin Pilot Sport 4S tyres quickly following suit, but it ultimately went three seconds quicker than the car from Crewe.

Thank rock-solid stability through the big braking zones and fastest corners along with the tractive benefits of a driven front axle. Few cars ask to be driven so hard but are then so tolerant of mistakes, if not outright provocation.

Comfort and Isolation

Simply put, if long-striding cruising refinement is more of a priority than usable, accessible rear seats, you’re better off buying an S560 Coupé than this; not that AMG diehards would even contemplate as much.

The GT63 is far from raucous at a cruise, but our noise meter recorded 72dB at 70mph, which compares poorly with the 66dB the Continental GT recorded and is considerably louder than even a BMW BMW M5. No single source for this cabin noise is readily apparent, and it’s certainly not enough to hinder conversation, but AMG’s in-house models have always generated a pervasive blend of wind and tyre roar in addition to the thrum of the engine, and that’s the case here.

But if the GT63’s aural finesse is a touch below par, the same cannot be said for the manner in which it cossets its occupants. AMG’s Performance seats might look the part but the standard items, as fitted to our test car, are more than adequately bolstered and supremely comfortable, even if their massagers feel a bit as though you’re being poked through an aeroplane seat.

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The car’s ride quality also belies the outward demeanour. There are occasional edges to be felt but they are softer and more infrequent than you’ll find in the CLS 53, and many other quick saloons besides. The car has a long-legged gait, and as one tester standing on a Welsh mountainside put it, you’d drive an M5 to London, but you’d drive the AMG all the way back to Affalterbach – and you’d enjoy every mile.