Quote:
Originally Posted by Eric_Oz_S2
Joshua
If the coil is charged with a 'constant 12v', why does the dme mapping adjust dwell for rpm AND battery voltage? Does the dme include a voltage regulator to cap the voltage to 12v?
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Perhaps that was a poor choice of words on my part.
The coil is supplied system voltage with the key on. So ideally this is 13.8 while the engine is running, but could be much lower (such as when cranking), or even higher if your voltage regulator isn't quite right.
This is why the DME adjusts dwell depending on both RPM and system voltage - it must cover the entire dynamic range of possible operation.