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Air temp compensation

Understanding AFR

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Discussion and questions related to the course Understanding AFR

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So I just finish this section and have a clear mind that we need to reduce 2.5% fuel when temp goes up every 10 Degree C. But i do not understand the example at the end, why we need to devide the target lambda to calculate the extra fuel?

Just as a quick note, you need to be careful with using the air temp compensation table, because some ECU with VE / Air Density fuel model already compensate for air temp. The air temp compensation table will be added over the "normal" fuel calculations.

You could use the air temp compensation table for protection, like adding extra fuel when the IAT goes too high, as an example.

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