Boost Leak
Unintended air escape in the pressurized intake system. Symptoms: can't hit boost target, high WGDC, lean trims.
Why it matters
Boost leaks are one of the most common causes of underboost and lean conditions. They waste turbo effort and reduce power.
What to look for
Boost actual consistently below target + WGDC higher than expected + positive fuel trims. Common leak points: charge pipe, intercooler boots, BOV.
Related terms
How hard the ECU is working to keep the wastegate closed and maintain boost. 0% = fully open, 100% = fully closed.
The boost pressure the tune is requesting. Actual boost should track this closely.
The ECU's real-time, moment-to-moment adjustment to fueling. Think of it as the ECU saying "right now I need to add a little more fuel" or "right now I need to pull back a little."
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