Lambda in reference to the Power Vision fuel tuner is a measurement of oxygen in the exhaust. Lambda is similar to Air Fuel Ratio, but is independent of fuel type. An AFR for pump gasoline of 14.64:1 (stoichiometric) is equivalent to lambda of 1. This is where an engine will generally produce the best fuel economy, and produce the least amount of harmful emissions. An AFR of 13:1 or lambda of .89 will generally produce the most power and torque.
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