There are different types and applications:
* Mechanical Throttle Stops: These are often physical screws or adjustments on a carburetor or throttle body that limit how far the throttle plate can open. They're frequently used in older vehicles or in applications where electronic controls are absent or undesirable.
* Electronic Throttle Stops: These are software-based limiters within the engine control unit (ECU). They're common in modern vehicles and can be set to restrict engine performance for various reasons, including:
* Preventing over-revving: To protect the engine from damage caused by excessive RPMs.
* Limiting power output: In some vehicles, different power levels (e.g., "Eco" mode) may use throttle stops to reduce the available power.
* Emissions control: Throttle stops can be used to regulate engine operation for better emission compliance.
* Governor: Sometimes used interchangeably with "throttle stop," a governor is a more sophisticated device that actively regulates engine speed, automatically adjusting the throttle to maintain a target speed, and preventing runaway speed.
In short, a throttle stop ensures the engine doesn't exceed a specified operational limit, safeguarding the engine and/or adhering to regulatory requirements.
