Revolution limiter off

A rev limiter is an automated, technical device on combustion engines that prevents a further increase in speed when an upper limit speed is reached.

A rev limitation is provided if there is a risk of mechanical destruction if a critical rev speed is exceeded, but also if increased wear is to be expected or if optimal operating conditions are maintained.

Diesel engines are always equipped with a rev limiter, since with mechanical injection systems without additional control, the injected fuel quantity increases with the engine speed (leakage losses in the injection system decrease).

Gasoline engines do not necessarily need a rev speed limiter in all cases, since the intake and flow losses have a throttling effect at high speeds.

In principle, a rev speed limiter can also be used to limit any speed. For this purpose, the engine speed combined with a specific gear can be converted to a speed (speed x gear ratio = speed) and the fuel supply can be throttled when a target value is reached.

The lifting or raising of the speed limit and the associated risks actually only makes sense in motorsport.