Injector Pulse Width = Cylinder Airmass / (Injector Flow Rate * Stoich AFR)Ĭylinder Airmass / (Injector Flow Rate * Stoich AFR) = 10 * Cylinder Airmass * Stoich AFR * Injector ConstantĪ little more algebra with the above terms, we finally arrive at: To estimate a totally unknown injector constant, you can use a formula for fuel mass:Ĭylinder Airmass / Stoich AFR = Injector Pulse Width * Injector Flow Rate Note that this calculated Pulse Width does not account for any corrections (Injector Offset, Load Mult, fuel trims, PE, etc.). Injector Pulse Width = 10 * Cylinder Airmass * Stoich AFR * Injector Constant Because it's not totally clear what the Injector Constant is relative to, I went and did some logging to back out the logic here's my current best model:
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