Wastegate Duty Cycle
How hard the ECU is working to keep the wastegate closed and maintain boost. 0% = fully open, 100% = fully closed.
Why it matters
High WGDC at low boost means the turbo is struggling. Near 100% means the turbo is at its control limit and has no headroom.
What to look for
Below 85% is healthy. 85-95% is a warning. Above 95% means the turbo is maxed out and you may need a larger turbo for more boost.
Related terms
The boost pressure the tune is requesting. Actual boost should track this closely.
When actual boost exceeds target and the wastegate can't bleed enough exhaust to control it. Dangerous at high RPM.
How long it takes the turbo to reach target boost from low RPM. Affected by turbo size, exhaust flow, and wastegate behavior.
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