Common Abbreviations in Calibrations

🧠 Part of the TuningBot ECU Knowledge Base — in-depth documentation on ECU logic, maps, emissions systems and safe calibration methods.

ECU calibration involves numerous abbreviations.

Air/Boost

MAF (Mass Air Flow), MAP (Manifold Absolute Pressure), IAT (Intake Air Temp), VE (Volumetric Efficiency), VGT (Variable Geometry Turbine)

Fuel

IQ (Injection Quantity), SOI (Start of Injection), CR (Common Rail), AFR (Air-Fuel Ratio), STFT/LTFT (Fuel Trims)

Ignition

BTDC/ATDC (Before/After Top Dead Center), MBT (Maximum Brake Torque), KR (Knock Retard)

Torque

DW (Driver Wish), TL (Torque Limiter), TM (Torque Monitoring), BMEP (Brake Mean Effective Pressure)

Emissions

EGR, DPF, GPF, SCR, DOC, TWC, NOx, PM

Temperature

ECT (Coolant), EGT (Exhaust Gas), EOT (Oil), CAT (Charge Air)

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