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Focused on using RPM limits to control launching, this concept is about a Stage Rev Limiter. A stage limiter allows different RPM ceilings depending on the situation, which is exactly what two-step launch control does: it sets a lower, initial RPM limit to help build boost and keep the tires from spinning hard during the start, then transitions to the higher, normal limit once the launch is underway.

Spark rev limiter simply cuts spark at a chosen RPM, which is not tailored for a smooth, repeatable launch and can hurt throttle response. Fuel rev limiter cuts fuel at a set RPM, also not ideal for a controlled launch profile. Open loop refers to a fueling strategy that runs without feedback, not to RPM staging. So the two-step launch control is best explained by a Stage Rev Limiter, enabling a deliberate, multi-step RPM strategy for launching.