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Originally Posted by blueroadster
I'll try to explain in simpler terms. Say for example the flow rate of fuel going through the injectors and controlled by the ECM is rated at a flow rate of 1 through 5, where 5 would be the the most amount of fuel dumped.
Now lets say that the ECM regulates the fuel at a flow rate of 3.
You decide to add more fuel via a piggy-back fuel controller to increase the flow rate one more number higher (i.e., to 4) to make it run more rich.
What will happen is that the ECM would send a flow rate of 3, the piggy-back would add one number to make it 4, but when the ECM senses that the engine is running rich, then it will self-correct and bring the resulting number back to 3 (i.e., the ECM would send a flow rate of 2 and the piggy-back fuel controller would increase it to 3 which is exactly what the ECM wanted in the first place even without the fuel controller).
There is a lot more to it than that, but hope the above example makes sense.
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Thanks, blue, and I am trying to learn how these work with our engine.
In a real world example, the piggyback wouldn't add 1 to make the engine run rich, it would add 1 to keep it from running lean, right? Then, the ecm would sense that the engine is running within limits (because it really needed more fuel to be correct), and the ecm would continue to generate an output of 3 with the piggyback adding 1 to get to a constant 4. This would continue until the fuel requirements change again. Does that make sense, or am I still missing something?