Mercedes-AMG has upgraded the flagship versions of the GLE and GLS SUVs with its new flat-plane-crank twin-turbo V8 engine as part of a range of mid-life updates. The new engine produces 604 horsepower and 627 lb-ft of torque on its own, but it is supplemented by a 48V mild-hybrid integrated starter-generator that can add an extra 23 horsepower and smooths out the delivery of torque.
The V8 features a motorsport-inspired flat-plane crankshaft, along with a revamped firing order for the cylinders, which is intended to reduce vibration and smooth out the power delivery. There's also an upgraded fuel injection system, new air intake and exhaust ports, a reworked camshaft, and a revised turbocharger housing.
View Price on AmazonThe new V8 enables both of the 63 SUVs to accelerate from 0-60 mph in less than four seconds and they have identical top speeds of 174 mph. Both cars also receive a range of other updates, including a revamped exhaust system that automatically adjusts the flaps to boost the sound of the engine. In addition, there's an updated active ride control system to reduce body roll, while the front and rear driveshafts have been upgraded to cope with the new V8's high levels of torque. The GLS also features a rear axle locking system to boost agility.
The GLE Coupé and SUV and the GLS gain new front ends with a bespoke AMG grille, larger air intakes, and revamped lights. The GLE 63 rides on wheels of up to 22 inches in diameter, with the GLS's rising to 23 inches.
Source: autocar.co.uk
