It’s important to note that there are two types of limiters: «Hard REV» and «Soft REV».

The Hard REV, also known as the «Popcorn Limiter,» is achieved by adjusting the torque and fuel injection parameters to set the RPM at which the limiter will activate. Additionally, the injection timing maps must be adjusted to delay the injection, allowing unburned fuel to fill the combustion chamber and be expelled through the exhaust. This type of limiter is the most aggressive, creating a distinctive visual and sound effect.

The Soft REV can be configured in two ways. When available, you can use the RPM limiter maps in the ECU’s driver, which function as overspeed thresholds. Once a certain limit is exceeded, the ECU automatically cuts fuel injection to prevent engine damage. By adjusting this threshold, you can precisely define the RPM at which the fuel cut-off occurs, thus activating the limiter. Alternatively, when this option isn’t available, adjustments can be made to the fuel and torque maps. In this case, the procedure is similar to the Hard REV, but without altering the injection timing.