Lambda Target Calculator

Calculate optimal lambda/AFR targets for different engine operating conditions including WOT, cruise, idle, and cold start.

Input Parameters

Results

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WOT Lambda Target
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Cruise Lambda Target
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Idle Lambda Target
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WOT AFR Target
Note: Lambda 1.0 = stoichiometric. Rich mixtures (lambda <1) cool combustion for safety. Lean cruise improves economy but increases NOx. Always tune on a dyno.

Reference

Lambda = AFR / Stoich_AFR Stoich: Gas=14.7, E85=9.76, Methanol=6.45 WOT Lambda: 0.80-0.85 (gas), 0.85 (E85), 1.15 (diesel) Cruise: Lambda 1.0 (gas/E85), 1.3 (diesel) Enrich under high boost, IAT, or cold coolant