Drivetrain

Throttle Closure

When the DME reduces throttle angle even though the driver's pedal is at 100%. Used as secondary boost control to prevent overboost or protect the engine.

Why it matters

Throttle closure at WOT means the ECU is intervening. This can be normal boost control or a sign of safety limits being hit.

What to look for

Throttle angle dropping below 95% while pedal is at 100%. Check if boost, temps, or torque limits are causing the intervention.

Related terms

Torque Limiters

Internal ECU/TCU software caps that prevent the engine from producing more torque than the transmission can safely handle.

Thermal Protection

When the DME reduces power output because temperatures have exceeded safe thresholds. Manifests as throttle closure or reduced boost target.

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