Fuel Table Correction Calculator

Compare measured and target lambda or AFR to estimate a proportional fuel adjustment for a matching RPM/load cell. Positive correction adds fuel; negative correction removes fuel.

All Calculators

Reading type

Existing table cell type

Measured lambda / AFR

Target lambda / AFR

Existing fuel-table cell value

Injector dead time included in existing cell (ms; total-time mode only)

Results update as you type.

Results

Use stable, synchronized measurements for the same RPM/load cell. AFR readings must use the same stoichiometric display scale. Lambda is preferred when fuels differ. The multiplier assumes unchanged airflow and fuel properties, with fuel quantity proportional to the corrected value. Account for active closed-loop trims and transient corrections before changing the base map. Do not stack this correction on top of compensation already applied. For total-time cells, dead time is kept separate; ECU table conventions differ. Check sensor accuracy and verify the tune after a change.

Formula and assumptions

Fuel multiplier = measured ÷ target. Correction % = (multiplier − 1) × 100. New proportional cell = old cell × multiplier. For total injection time including dead time: new time = (old time − dead time) × multiplier + dead time.