Boost Creep
When actual boost exceeds target and the wastegate can't bleed enough exhaust to control it. Dangerous at high RPM.
Why it matters
Uncontrolled overboost can cause detonation and engine damage. It means the turbo is producing more boost than the wastegate can regulate.
What to look for
Actual boost exceeding target by 3+ PSI at high RPM is a warning. WGDC at 100% during boost creep confirms the wastegate is maxed.
Related terms
How hard the ECU is working to keep the wastegate closed and maintain boost. 0% = fully open, 100% = fully closed.
When actual boost pressure exceeds the target. Can be intentional (brief overshoot) or dangerous (wastegate failure, boost creep).
The boost pressure the tune is requesting. Actual boost should track this closely.
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