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Ignition cut used for rpm limiter - Regular Apexi Power FCs cut fuel feed when the preset revolution limit is reached. At high rpm, there is the possibility of knocking when the fuel is cut in high powered cars. The Apexi Power FC Pro Spec.CPUs cut ignition at the rpm limit to prevent the knocking that could potentially destroy the engine.
0km/h rpm limiter setting - Allows for the setting for an initial rpm limiter that is active whilst the car is not in motion. This allows for mainting a rpm level for consistent launches.