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A 2 step rev limiter is normally used with a transbrake on an auto, so that when the transbrake is engaged it has a lower rev limit to hold thottle to floor while on starting line, and then once released it switches over to higher rev limit. If not for this, rpms would go to high with thottle to the floor at starting line.
A transbrake holds the car in both forward and reverse gears to prevent it from moving while engaged, so that thottle can be held to floor and button released to launch car at full thottle and the 2 step would allow you to control that launch RPM.
Using 2 step on manuel would be more of a launch control using clutch.
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