Posted by Oliver 500 Wa on August 18, 2018 at 08:50:32 from (73.96.106.221):
In Reply to: More generic EFI talk posted by David G on August 17, 2018 at 16:53:43:
The low cost O2 sensors are "narrow band" type. Great for the ECM to tweak the fuel trims while driving,but tough to use for working out the fuel maps while setting up a system.
To set up a system, you need a "wide band" sensor. The one I have for my toy car was about $450.
Since tractors are usually used in one small geographic area, it's relatively easy to get a base map that will work well without an O2 sensor. This would be considered an "open loop" control.
For cars and trucks, it helps a lot to have the O2 sensor data feeding the ECM to help with fueling need changes. Imagine driving from a low elevation to a mountain pass. Input from the O2 sensor in conjunction with a barometric pressure sensor lets the ECM stay closer to an ideal fuel/air ratio. The O2 sensor makes the control system a "closed loop" system.
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Today's Featured Article - Horsepower Defined - by Staff. Indicated Horsepower This represents the power developed in the enine cylinder as obtained from the pressure in the cylinders. This is pressure obtained from an indicator which shows cylinder pressures. Indicated horsepower does not represent the actual useful power delivered by the engine. Brake Horsepower This is the actual horse power delivered by the engine to the shaft. It is equal to the "indicated horsepower" less the friction of the engine. It is useful hor
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