4.0-litre twin-turbo V8 engine and MCT 9-speed sports transmission: New peak of performance with twin-scroll turbochargers
The versatile AMG 4.0-litre twin-turbo V8 engine in the E 63 S 4MATIC+ takes peak performance to a new level at 450 kW (612 hp). Maximum torque attains a new best value of 850 Nm. It is available over a broad engine speed range of 2500 to 4500 rpm and so provides a feeling of effortless superiority in every accelerator pedal position. The E 63 4MATIC+ is rated at 420 kW (571 hp) and has 750 Nm of torque. Thanks to the cylinder deactivation system fitted as standard and other measures, the new sports saloon is also a paragon of efficiency. With a combined fuel consumption of 8.8 litres and CO2 emissions of 199 grams per kilometre (combined), the E 63 4MATIC+ and E 63 S 4MATIC+ set a new best by comparison with their competitors.
The advanced AMG 4.0-litre V8 biturbo engine utilises well-proven twin turbocharging, with the two chargers not located outside on the cylinder banks, but rather between them in the V of the cylinders. The advantages of the "hot inner V" are a compact engine design, an immediate response from the twin-scroll turbochargers and low exhaust gas emissions thanks to optimum air flow for the close-coupled catalytic converters.
Two twin-scroll turbochargers are deployed for the first time to boost performance and improve responsiveness further. The housing is divided into two parallel flow passages. Combined with two separate exhaust ducts in the exhaust manifold, this makes it possible to control the exhaust gases on the turbine wheel separately. The exhaust gas from the first and fourth cylinders of the cylinder bank is fed into one duct and exhaust gas from the second and third cylinders to the other duct. The aim is to prevent the individual cylinders from having mutually adverse effects on the gas cycle. This reduces the exhaust gas back pressure and improves gas exchange.
The results are increased output due to improved cylinder charge with fresh mixture, more torque at low revs and very immediate response times. Other engine measures include new pistons, an optimised air intake and charge air cooling, as well as extensive software developments.
Spray-guided direct petrol injection with piezo injectors, the all-aluminium crankcase, the four-valve-per-cylinder design with camshaft adjustment, air-water charge air cooling, alternator management, the ECO start/stop function and the gliding mode have all been retained.
To sum up, the eight-cylinder engine thrills with its exceptional power delivery and powerful acceleration in all engine speed ranges combined with maximum efficiency for low consumption and emission values.
AMG Cylinder Management
For maximum efficiency, Mercedes-AMG has equipped the V8 engine with the AMG Cylinder Management cylinder deactivation system. This has already helped the SLK 55 to achieve impressively low consumption and emission values and is now being used with a turbocharged engine from the high-performance sports car brand for the first time. In the partial-load range cylinders two, three, five and eight are deactivated, which crucially lowers the fuel consumption.
When the driver has selected the "Comfort" transmission drive program, the cylinder deactivation system is available in the wide engine speed range from 1000 to 3250 rpm. A special display on the instrument cluster informs the driver whether the cylinder deactivation system is in use and whether the engine is presently operating in the partial or full-load range. The transition from four to eight-cylinder operation is immediate, fast and imperceptible, so that the passengers do not experience any loss of comfort whatsoever.
Valves closed, fuel supply and ignition deactivated
This is made possible by intelligent interaction between the high-performance engine management system and CAMTRONIC valve lift adjustment, which is familiar in a similar configuration from the four-cylinder engines. There are eight dual actuators involved in half-engine mode, which operate the axially sliding cam units of the intake and exhaust camshafts via a shift gate. Half-engine operation is achieved by shutting off the relevant intake and exhaust valves of cylinders two, three, five and eight. This not only enables the load-change losses of the four deactivated cylinders to be reduced, but also increases the efficiency of the four remaining cylinders. The reason for this is to shift the operating point to higher loads.
E 63 S 4MATIC+ with dynamic engine mounts as standard
Uniquely in this segment, the E 63 S 4MATIC+ is fitted with dynamic engine mounts. These help to solve the conflicting goals of achieving as soft a connection as possible to the powertrain for high comfort and as rigid a connection as possible for optimum vehicle dynamics. The dynamic mounts are instantly and variably able to adapt their stiffness to the driving conditions and requirements. These measures enhance the vehicle's precision when driven dynamically. The steering response and steering feedback, for example, are thus even more direct. When cornering, the ride feels more precise and the driver needs to make fewer corrections because movement of the major assemblies is minimised. On the racetrack there is no compromise on the rigidity of the mounts, which further reduces the major assemblies' propensity to inertia, and thus helps to improve lap times. Conversely, softer mounts noticeably enhance comfort on poor stretches of road, for example. In the case of undulating surfaces, increased damping steadies the powertrain as quickly as possible.
Short shift times, high efficiency: the AMG SPEEDSHIFT MCT 9-speed sports transmission
The AMG SPEEDSHIFT MCT nine-speed sports transmission is specially tuned to requirements in the new E 63 4MATIC+ and E 63 S 4MATIC+. This involved re-engineering hardware and software alike.
Special software enables extremely short shift times and fast multiple downshifts and the double-clutching function, making for a highly emotive gearshifting experience. A wet start-off clutch replaces the torque converter. This saves weight and optimises the response time to the driver's accelerator pedal input, particularly when accelerating and during load changes.