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2019 Mercedes-AMG CLS 53 Test Drive, Walkaround, Interior

1,234 views · Published 2 March 2018 · 10:06 · Indexed 28 September 2026

Channel: Motorward · 2018 · Autos & Vehicles

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The new Mercedes-AMG CLS 53 4MATIC+ (combined fuel consumption 8.7 l/100 km, combined CO2 emissions 200 g/km)[1] combines sporty design with powerful performance and high efficiency. Its centrepiece is a new, electrified 3.0-litre engine featuring twin-turbocharging and an electric auxiliary compressor. The 6-cylinder in-line engine generates 320 kW (435 hp) and delivers maximum torque of 520 Nm. Its EQ Boost starter-generator delivers an additional 16 kW (22 hp) and 250 Nm over a short period, and feeds the 48 V on-board electrical system. Other technical highlights include the AMG SPEEDSHIFT TCT 9G transmission and the fully variable all-wheel drive system AMG Performance 4MATIC+.

"The new CLS 53 4MATIC+ extends our portfolio with a future-oriented combination of sporty design, performance and efficiency. The basis for this is a contemporary drive configuration in the form of a six-cylinder in-line engine with electric auxiliary compressor, EQ Boost starter-alternator and 48 V on-board electrical system. The very spontaneous response to accelerator pedal input, the precision and the design focusing on driving dynamics are hallmark features of AMG. As such we are providing an additional lifestyle-oriented customer group with a further attractive offering from Affalterbach", explains Tobias Moers, Chairman of the Board of Management of Mercedes-AMG GmbH.

Six-cylinder in-line engine with EQ Boost starter-alternator

The six-cylinder in-line engine is characterised by top-of-the-range performance and intelligent electrification. The EQ Boost starter-alternator combines a starter motor and alternator in a powerful electric motor and is fitted between the engine and transmission. This innovation as well as the intelligent charging via an electric auxiliary compressor and an exhaust gas turbocharger all have the same goal: to enhance the hallmark AMG performance and driving dynamics, while at the same time reducing fuel consumption and emissions. And this move has been a successful one: the CLS 53 4MATIC+ accelerates from zero to 100 km/h in just 4.5 seconds, and with the Driver's package achieves a top speed of 270 km/h. The combined fuel consumption is 8.7 l/100 km, with combined CO2 emissions of 200 g/km.

High torque without lag

Supported by the EQ Boost starter-alternator when moving off, the electric auxiliary compressor builds up a high charge pressure without any delay, for a faster increase in torque for acceleration until the large exhaust gas turbocharger is deployed. As a result the 3.0-litre engine reacts extremely spontaneously and provides a highly dynamic response without turbo lag. An additional bonus is the high level of refinement of the six-cylinder in-line engine.

Paving the way for hybrid functions: 48 V on-board electrical system

The power for the 48 V on-board electrical system is generated by the EQ Boost starter-alternator. The conventional 12 V network is likewise supplied from the new network – using a DC/DC converter. Thanks to the 48 V battery, the overall battery capacity in the vehicle is increased to enable more electrical energy to be made available ‑ thereby also allowing innovative functions to be introduced, for example. The 48 V on-board electrical system is therefore paving the way for further hybridisation. An additional advantage: the same power requires only a quarter of the current of a conventional system. The result is that the wiring can be thinner and therefore lighter, which indirectly contributes to saving fuel. The existing 12 V system supplies power to consumers such as lights, cockpit, infotainment displays and control units.

Hybrid functions thanks to EQ Boost starter-alternator

The EQ Boost starter-alternator is a key component of the 48 V system and not only serves as an alternator, but is also responsible for hybrid functions. This allows fuel savings that were previously reserved for high-voltage hybrid technology. For the first time, the EQ Boost starter-alternator is also responsible for idle speed control.

The hybrid functions include boost with 16 kW (22 hp) of output and 250 Nm of torque, recuperation, shifting of the load point, gliding mode and virtually imperceptible restarting of the engine with the start/stop function.

Because the belt drive for ancillary components on the front edge of the engine is omitted, the installation length of the new six-cylinder engine is also significantly reduced compared with conventional six-cylinder engines. This creates space for an exhaust gas aftertreatment system mounted near the engine, which is therefore particularly efficient. The standard-fit particulate filter is the only part of the exhaust system that is under the floor.

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