Boost

Compressor Surge

When airflow reverses momentarily through the turbo compressor during a sudden throttle lift at boost. Causes fluttering and turbo wear.

Why it matters

Repeated surge events accelerate bearing wear and can damage the compressor wheel over time.

What to look for

Rapid boost oscillations during throttle lift. A blow-off valve or bypass valve should prevent this.

Related terms

Wastegate Duty CycleWGDC

How hard the ECU is working to keep the wastegate closed and maintain boost. 0% = fully open, 100% = fully closed.

Boost Target

The boost pressure the tune is requesting. Actual boost should track this closely.

Want to learn more about Compressor Surge?

Get our free logging setup guide -- covers the channels you need, what to look for, and how to interpret your data like a pro.

See Compressor Surge in action

Upload your datalog and every finding, including Compressor Surge, will be explained in plain English with actionable next steps.

Analyze your own log
Back to full glossary