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Old 10-05-2010, 04:44 PM   #8 (permalink)
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Location: Germantown, WI
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Allow me to answer your question with a question. How does an engine know how much fuel to inject? It calculates it based off the amount of air flowing into the engine. It knows the maximum amount of air it can let in (for the most part, there is compensation for air density etc so LOD isn't 100% exact), and it knows the minimum amount of air. Calculating percentage is a small step away then.
Current project: A better alternator delete
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