A rev limiter is a device fitted in modern vehicles that have internal combustion engines.

They are intended to protect an engine by restricting its maximum rotational speed, measured in revolutions per minute (RPM).

Rev limiters are pre-set by the engine manufacturer.

There are also aftermarket units where a separate controller installs,uses a custom RPM setting.

A limiter prevents a vehicle’s engine pushes beyond the manufacturer’s limit known as the redline (literally the red line marked on the tachometer).

At some point beyond the redline, engine damage may occur.

Types of control
Fuel control:
Fuel-cutting rev limiters are the most common because they wear less on exhaust components.
These systems usually lean out the engine’s overspeed by shutting off the fuel injectors, and are the only practical system on diesel engines.
This is less popular in high performance engines due to high temperatures in lean operation.

Spark control:Ignition control rev limiting systems work by shutting off the spark plugs once the engine overspeeds.
This is less common in production vehicles because the system still injects fuel into the cylinder and consequently releases unburned fuel which may ignite at a turbo charger or in the exhaust pipe.
This can affect the temperatures in the exhaust, causing premature wear on the catalytic converter.

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