In most cases, changing spark plugs alone does not directly make a car faster. Spark plugs primarily function to initiate combustion within the engine by creating a spark that ignites the air-fuel mixture. While new spark plugs may help maintain the proper functioning of the ignition system and ensure efficient combustion, the performance-enhancing impact is usually negligible.
To increase the overall acceleration or speed of a car, significant modifications, often involving various system upgrades and component enhancements, are necessary. Engine tuning, turbocharging, supercharging, or other more comprehensive strategies to enhance power output would likely achieve a noticeable performance gain compared to simple spark plug replacement.
