Rev Limiter

It works in every gear and in neutral. Some cars have a lower limit in neutral or when cold. It cannot prevent over-revving from a wrong downshift. Hard limiters cut fuel completely and cause a noticeable bounce; soft limiters reduce power gradually. Some performance cars have launch control that sets a temporary lower limit.

The control unit briefly interrupts injection or ignition when the limit is reached.

Hitting the limiter repeatedly stresses the engine. Missed downshifts can over-rev the engine mechanically.