A performance tune, through modifications to engine control unit (ECU) parameters, alters aspects like fuel injection, ignition timing, and boost pressure (in turbocharged or supercharged engines). This optimization can extract additional power from an engine, often resulting in noticeable gains in acceleration and overall performance. For example, a naturally aspirated engine might see a 5-15% increase, while a turbocharged engine, with greater potential for modification, could experience gains of 20-30% or even more. The specific outcome depends heavily on the engine’s design, the tuning method, and the quality of the components.
Increased power output translates to improved driving experience, offering quicker acceleration for overtaking and merging. Furthermore, tuning can sometimes enhance fuel efficiency under specific driving conditions, although this is not always the primary goal. Historically, engine tuning was a highly specialized process involving physical adjustments to the engine’s components. Advancements in electronics have enabled software-based tuning, making it more accessible and precise.