Engine tuning, through modifications to software parameters controlling fuel delivery, ignition timing, and boost pressure (in forced-induction engines), alters engine performance. The power increase achievable varies significantly depending on the engine’s design, the tuning method employed, and the desired balance between performance and engine longevity. For example, a naturally aspirated engine might see gains of 5-15%, while a turbocharged engine could experience improvements of 20-30% or even more.
Enhanced power output translates to improved acceleration and potentially higher top speed. Furthermore, tuning can optimize fuel efficiency under specific driving conditions and sometimes improve throttle response. Historically, tuning involved physical modifications to carburetors and distributors. Modern advancements in electronic control units (ECUs) allow for precise software adjustments, offering greater control and flexibility over engine behavior.