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Rev Limiter

Car culture term

What is Rev Limiter?

A rev limiter is an electronic or mechanical control that stops an engine from spinning past a set RPM, protecting it from damage once it reaches its redline.

A rev limiter is a safeguard built into an engine's control system that prevents the crankshaft from spinning faster than a predetermined maximum RPM. Modern engines almost universally use electronic rev limiters managed by the engine control unit, which monitors RPM continuously and intervenes once the limit is reached, while older or more basic setups sometimes used simpler mechanical or ignition-based limiting circuits. The limit itself is closely tied to the engine's redline, the maximum safe operating RPM defined by the engine's mechanical design, though the rev limiter is typically set slightly above redline to provide a hard stop just past where damage risk becomes significant.

Rev limiters intervene using one or more methods: fuel cut, where the engine control unit stops delivering fuel to some or all cylinders once the limit is reached; ignition cut, where spark is interrupted instead of or in addition to fuel; or, on older or more crude systems, a governor that mechanically restricts throttle or fuel delivery. Fuel and ignition cut limiters typically produce the sharp, stuttering sensation drivers feel when an engine bounces off its rev limiter, since the engine is rapidly gaining and losing power as the limiter cycles on and off just below the cutoff.

Beyond the factory setting, rev limiters are a common target of aftermarket tuning, since raising the limit alongside supporting hardware and software changes can unlock extra power at the top of an engine's rev range, particularly on engines whose mechanical components can safely handle higher RPM than the factory calibration allows. Conversely, launch control systems intentionally use a separate, lower rev limiter to hold the engine at an optimal launch RPM before a standing start, distinct from the standard high-RPM protective limiter.

Related terms

RedlineLaunch controlDynoHorsepowerVTEC

Frequently asked questions

What is the difference between redline and rev limiter?
Redline is the maximum RPM an engine is designed to safely reach under normal operation, usually marked on the tachometer. The rev limiter is the actual electronic or mechanical control that enforces a hard stop, typically set at or just above the redline.
What does it feel like to hit a rev limiter?
Most drivers describe a stuttering or bouncing sensation as the engine rapidly gains and loses power, caused by the fuel or ignition cut cycling on and off just below the cutoff RPM, commonly called bouncing off the limiter.
Can raising the rev limiter increase horsepower?
It can, if the engine's mechanical components can safely handle the higher RPM and the power curve is still climbing near the factory limit, but raising it without addressing the underlying mechanical or tuning limitations that set the original cutoff risks engine damage.
Is hitting the rev limiter bad for an engine?
Occasional, brief contact with a properly functioning rev limiter is generally not harmful, since it exists specifically to prevent damage. Frequent, sustained bouncing off the limiter, however, adds unnecessary stress and is generally avoided in normal driving.
How is launch control related to the rev limiter?
Launch control uses a separate, lower rev limiter to hold the engine at a specific optimal RPM while the driver is stopped and ready to launch, distinct from the standard high-RPM protective limiter used during normal driving.
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