Mercedes-Benz AMG SL 43 comes with 4-cylinder engine, electric turbo

Mercedes-Benz AMG on Wednesday unveiled a new version of its redesigned SL Convertible, powered by a 4-cylinder engine.

The car slot is roughly where the V-6-powered SL 400 resides, although its availability in the United States has not yet been confirmed.

Beneath the hood is a 2.0-liter turbocharged inline-4 that automatically generates 381 hp and can get a temporary 14-hp boost from a light-hybrid system. While this is nothing new, the engine’s turbocharger is an electrical design used in Formula One.

We have seen that automakers offer engines with electric compressors, where an electric motor is used to rotate a compressor which helps to provide boost pressure to an engine during low revs, a conventional turbocharger takes charge once the revs are made. The result is a strong engine response from idle, which you don’t usually get with a turbocharged engine.

Mercedes-Benz AMG SL 43

Mercedes-Benz AMG SL 43

Mercedes-Benz AMG SL 43

Mercedes-Benz AMG SL 43

Mercedes-Benz AMG SL 43

Mercedes-Benz AMG SL 43

In the case of the SL 43 engine, the electric motor is integrated directly with the turbocharger, sitting between the turbine wheel on the exhaust side and the compressor wheel on the intake side. In F1, the electric motor is also used to recover power from exhaust when no boost is required, although this is not the case with the SL 43.

Instead, electric motors here rely on energy delivered from light-hybrid systems. This 48-volt system is basically a beefed-up electric starter motor capable of assisting the engine during high loads and recovering power under braking.

Unlike the V-8-powered SL 55 and SL 63, which come with standard all-wheel drive, the SL 43 only comes with rear-wheel drive. A 9-speed automatic transmission is common to all versions. Using launch control, Mercedes claims that the SL 43 will sprint from rest at 62 mph in 4.9 seconds and reach the top at 170 mph.

We’ll see this same engine setup filter in more models from the AMG portfolio, including an updated compact range and a redesigned version of the C63 and GLC 63. The motor helps to provide a combined output of more than 600 hp.

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