Soft Limiter

The soft limiter is the primary line of defense against engine over speed conditions. To reduce engine speed, it can limit throttle position, employ ignition retard, or both.

Throttle position limits will become active if all three of the following conditions are met:

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Soft Limiter Enabled = YES (the feature has been manually enabled)

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Throttle Body Type = Drive By Wire or Dual Throttle Body (throttle can't be electronically controlled in Drive By Cable mode)

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The engine speed is greater than the Soft Limiter Threshold specified in the currently-selected map.

Ignition retard control will become active if all of the following conditions are met:

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Soft Limiter Enabled = YES (the feature has been manually enabled)

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Soft Limiter Ignition Retard Enabled = YES (soft limiter control of ignition retard has been manually enabled)

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The engine speed is greater than the Soft Limiter Threshold specified in the currently-selected map.

Throttle position and/or ignition retard limits will remain active until engine speed falls below Soft Limiter Threshold - Soft Limiter Threshold Hysteresis.

Once throttle position limiting is active, the soft limiter will begin making corrections to throttle position using its own PID controller, which uses Soft Limter Threshold as the target engine speed.

Once igntion retard control is active, soft limiter simply applies the amount of retard specified in the currently-selected Soft Limiter Ignition Retard Map.