The car is powered by the M838T 3.8 litre twin-turbo V8 engine, designed and developed by McLaren in partnership with Ricardo. The design of the engine was based on the Nissan VRH35 racing engine used in Le Mans in 1998. However, other than the 93 mm bore, little of that engine remains in the M838T. It produces 592 bhp (441 kW; 600 PS) and 443 lb·ft (601 N·m) of torque. It has a redline of 8,500 rpm, with 80% of torque available at just 2,000 rpm. When first announced, McLaren claimed that it would have a higher horsepower to carbon dioxide emission ratio than any internal-combustion engine available at the time.