Effective Area

[spy2520]

Any idea how the PCM calculates airflow from effective area in B4403?

[eficalibrator]

They use the compressible flow equation(s), just like every other major OEM. It's in the appendix of John B. Heywood's text: http://www.amazon.com/Internal-Combustion-Engine-Fundamentals-Heywood/dp/007028637X

[joecar]

Thanks Greg.