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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