Naturally Aspirated: The naturally aspirated version of the 1.8-liter engine does not have a turbocharger. It relies solely on the pistons to compress the air-fuel mixture before combustion. This type of engine typically produces less power and torque compared to a turbocharged engine of the same size.
Turbocharged: The turbocharged version of the 1.8-liter engine has a turbocharger, which is an air compressor driven by the exhaust gases. The turbocharger compresses the air and forces it into the engine, increasing the air-fuel mixture's density. This results in more power and torque compared to the naturally aspirated version.
So, the Audi 1.8-liter engine is available with both naturally aspirated and turbocharged options, and they differ in terms of their performance characteristics.
