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Originally Posted by Mr Bigs
The same will happen with almost any piggyback. The ecm wants to run the show.
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Quote:
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Originally Posted by blueroadster
Yup.
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It's true that the ecm wants to runs the show, but the one who really runs the show is the one whose output signal is actually connected to the control devices. The ecm can generate output signals, but if those signals do not make it to the control device (e.g., injectors, timing, spark ignition, etc.), then the ecm really isn't in control.
What I don't know (or have any knowledge of), is when you add e-Manage or v-Manage, do these devices insert themselves in-between the ecm's output and the control device? Or, do these simply provide modified input signals to the ecm in order to manipulate the ecm's output? Or both?