What is mainly a disadvantage of using a turbocharger in an engine?

The primary disadvantage of using a turbocharger in an engine is turbo lag. This phenomenon occurs because there is a delay between the time the driver accelerates and the moment the turbocharger provides the boost. Turbo lag happens as the turbocharger relies on exhaust gases to spool up and generate additional airflow into the engine. During this interval, there can be a noticeable hesitation in engine response, which may affect driving experience, particularly in situations that require quick acceleration.

Other potential drawbacks, such as weight and complexity of installation, exist but do not significantly influence the immediate performance dynamics as much as turbo lag does. Additionally, while turbocharged engines can sometimes lead to higher fuel consumption if not tuned correctly, they often improve fuel efficiency compared to naturally aspirated engines under specific conditions. Thus, turbo lag stands out as a notable disadvantage directly impacting the responsiveness of the vehicle.