Quote:
Originally Posted by dannichols1474
Fuel temp and fuel pressure are not monitored directly, although air temp could be considered a proxy for fuel temp as delivered to the injectors (not accounting for cooling effects due to the latent heat of vaporization when the injector sprays fuel into the intake port).
On the flip side, my system is running closed loop (when it is warmed up and within upper / lower limits of MAP and TPS) as I have the EGO (exhaust gas oxygen) Correction enabled and the ECU monitors the actual AFR against the target AFR and makes corrections to the fuel injection pulse width in real time.
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Air temp is not a proxy for fuel temp. Fuel temperature affects fuel density so an EFI system monitoring fuel temp can compensate for changes in density. Changes in fuel pressure need to be compensated for as well.
A closed loop EFI setup can compensate for only so much variance. Changes in air density, air temperature, fuel temperature, and fuel pressure can easily exceed the limits of compensation when running in closed loop.