Mercedes-AMG has introduced a significant powertrain upgrade for its flagship GLE 63 and GLS 63 SUVs, replacing the previous-generation powertrain with the heavily revised M117 Evo V8 engine. The update prioritises thermal efficiency and dynamic response through the integration of 48-volt mild-hybrid architecture.
The core of the upgrade is a new 4.0-litre twin-turbo V8 featuring a motorsport-derived flat-plane crankshaft. This mechanical shift, combined with a recalibrated firing order, is engineered to reduce primary vibrations and deliver a linear torque curve. The update also includes a new high-pressure fuel injection system, redesigned air intake and exhaust ports, reworked camshaft profiles, and a revised turbocharger housing.
Operating independently, the internal combustion engine produces 450kW and 850Nm. It is directly supplemented by an integrated 48-volt starter-generator that provides an additional 17kW and 250Nm of transient torque under initial load. This electrified assistance eliminates turbo-lag and maintains kinetic momentum during gear transitions.
Both the GLE 63 and the larger GLS 63 utilise this combined output to achieve a 0-100km/h sprint time of 3.9 seconds for the GLE and 4.2 seconds for the GLS, with an electronically governed top speed of 280km/h.
To manage the revised powertrain, Mercedes-AMG has reinforced the front and rear driveshafts. Chassis dynamics are dictated by an updated active air suspension platform featuring recalibrated anti-roll hardware to minimise lateral weight transfer. The larger GLS 63 additionally gains an electronic rear axle locking differential to maximise mechanical grip and corner-exit traction.
Visual modifications are functional, encompassing a redesigned front fascia with larger lower cooling intakes and a bespoke AMG grille engineered to improve thermal management. The GLE 63 is equipped with alloy wheels measuring up to 22 inches, while the larger GLS 63 accommodates 23-inch rolling stock.
Both models also integrate a revised variable exhaust system that automatically modulates internal valving based on engine load and the selected drive mode. Australian timing, specifications and prices are yet to be confirmed.
