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What is the difference between speed density and Alpha N?

April 26, 2017density difference speed

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What is the difference between speed density and Alpha N?

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Alpha N uses input from TPS and RPM to set the fuel curve, while speed density uses a MAP sensor to identify engine “load”. An engine’s fuel requirements are directly related to load and corresponding RPM. The ability to tune to the constant change in engine load is desirable compared to Alpha N.