At low speeds the camshafts will move to open the valves later in order to make the engine smoother and improve idling. The N54 also uses direct injection, where highly pressurized fuel is sent directly to the cylinder's combustion chamber. The N54's cooling capabilities are also a big part of the engine's power, as its intercooler is designed to cool the turbocharged air by up to 80 degrees Celsius. Now the purpose of it having two turbochargers is to eliminate "turbo lag." At low engine speeds one turbo builds pressure while the other stays idle, so as to reduce the amount of time it takes for the turbo to act. Because the computer controls so much of the engine, a decent tune will get some good power gains out of the engine.
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