Fuel Efficiency
Limiters are used as a means of increasing the fuel efficiency of commercial motor vehicles. Limiters can be individually adjusted by fleet owners to meet the performance requirements of many different driving conditions. A limiter used for this purpose, however, especially if it is mechanical in nature, is more commonly categorized as a governor. Electronic adjustments require special diagnostic equipment to access control settings, and are limited to authorized personnel, such as a fleet manager or mechanic.
Due to their electrical nature, however, it is still possible to drive an engine beyond the maximum RPM level set by the limiter. This most commonly occurs in the case of selecting the incorrect gear with a manual transmission - for example, selecting second gear instead of fourth after shifting out of third. The speed of the vehicle and the drive wheels may drive the engine far beyond its intended range in this situation, likely resulting in rapid engine wear, and in extreme cases possible outright engine failure.
Read more about this topic: Rev Limiter
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