Engine VE % from measured MAF airflow, displacement and RPM.
Read MAF in grams/second at the RPM you care about (usually peak).
Displacement in litres and the RPM of the reading.
VE over 100% means forced induction or strong tuning; under 100% is normal for N/A.
VE is how completely each cylinder fills with air compared with its swept volume. 100% means it draws exactly its displacement per cycle; turbos push VE well above 100%.
VE% = MAF(g/s) × 120 ÷ (displacement_L × RPM × air-density). It compares real airflow against the ideal airflow for that displacement and RPM.
Speed-density ECUs use a VE table to estimate airflow and fuel. Comparing modelled VE with a real MAF reading is how tuners validate and scale that table.
The desktop Softechpro Solutions software corrects checksums for 260+ ECU families and does DPF/EGR/AdBlue/DTC off, Stage tuning and DTC diagnostics offline.
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