Mercedes Benz unveils the 630HP AMG GT 4 Door

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The car debuts in a trio of familiar model designations, and the three-engine lineup includes inline-six and V-8 offerings, all fed with forced induction. The GT53 is the opening gambit and uses the carmaker’s recently introduced turbocharged inline-six. It’s supplemented by a 48-volt electric motor (a setup first seen in the new CLS53). As in the CLS53, the 3.0-liter powertrain produces a maximum of 429 horsepower and 384 lb-ft of torque, with the electric motor contributing up to 21 ponies and 184 lb-ft. In combination with a nine-speed torque-converter automatic and 4Matic+ all-wheel drive, the combo is good for a 4.4-second sprint to 60 mph and a 174-mph top speed, according to AMG.

Like other AMGs wearing the “63” designation, the GT63 is powered by a twin-turbo 4.0-liter V-8. It’s paired with a slightly different nine-speed automatic—this one replaces the torque converter with a multiplate clutch pack—that incorporates AMG’s Race Start function. In the 4-Door model, output is 577 horsepower and 553 lb-ft. (That matches this engine’s numbers in the wildest version of the coupe, the track-monster AMG GT R.) AMG claims the GT63 can charge to 60 mph in 3.3 seconds on its way to a top speed of 193 mph.

Naturally, there’s also a “63 S” version. That variant turns up the wick to 630 horsepower and 627 lb-ft—meaning that the most potent AMG GT 4-Door exceeds the output of the two-door sports car, not to mention that of the 603-hp E63 S, which currently holds the title of fastest four-door sedan at our Lightning Lap test. In this car, the S’s extra oomph shaves 0.2 second off the factory zero-to-60-mph time and adds 2 mph to the terminal velocity, for new figures of 3.1 seconds and 195 mph. In both GT63 cars, the 4Matic+ all-wheel-drive system features an electronically controlled limited-slip rear differential; a selectable Drift Mode, in which torque is directed solely to the rear wheels, is standard on the GT63 S and optional on the normal GT63.

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