A turbocharged engine, on the other hand, uses a device to compress the air coming into the engine, making it denser. This denser air is then mixed with a correspondingly increased amount of fuel to give more chemical energy to the charge in the combustion chamber when the spark plug ignites it. For instance, if the turbocharger boosts the charge air to two times atmospheric pressure then the engine will give approximately twice the power of a normally aspirated engine.
