The AMG M178 3,982 cc twin-turbo, dry sump V8 motor has been comprehensively re-engineered through lightening and balancing the factory steel crankshaft and mating it to bespoke forged pistons with forged H-section connecting rods. A bespoke intake system running from the front of the nose individually feeds each cylinder bank via modified turbochargers, a twin-row intercooler system, and larger throttle bodies. The cylinder heads are CNC-ported, polished and gas-flowed and exhaust gases escape via a bespoke Inconel exhaust system, which helps to lower backpressure. The resulting reduction in exhaust gas temperatures allows the use of higher boost pressures.
The resulting output is 860 bhp with 1,000 Nm of torque.
To reliably handle this massive output the gearbox was re-engineered using a competition grade clutch pack featuring two additional clutches, a forged intake drive shaft, high-pressure valves, and an independent oil cooling system. The rear differential also has its own oil cooler. The cooling systems for the engine, gearbox and differentials had to be redesigned and re-dimensioned due to the greatly increased engine output and the extra heat generated. So the two turbochargers now have their own independent water-cooled circuit.
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