Modifying the relationship between engine speed and wheel speed in a front-wheel drive vehicle involves altering the final drive ratio, or potentially individual gear ratios within the transmission. This adjustment influences the vehicle’s acceleration, top speed, and fuel efficiency. For instance, a numerically higher final drive ratio will enhance acceleration but may reduce top speed and fuel economy, while a numerically lower ratio will improve fuel economy and top speed but reduce acceleration.
Altering this mechanical advantage can significantly affect the performance characteristics of the vehicle, making it suitable for various applications, such as racing, towing, or improved fuel conservation. Historically, these changes were primarily undertaken by mechanics specializing in drivetrain modifications. The advent of readily available performance parts and tuning software has made these adjustments more accessible, albeit still requiring considerable technical expertise.