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Originally Posted by keithmac
On my Megasquirt you can use the output from the pump as a trigger to go onto the second fuel tabel and spark table, so if the pump doesn`t trigger the maps don`t switch, seems the safest way to do it? if the pump/wiring fails the engine just runs in non-water mode.
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One thing that I am keen to get working is to use the flow meters Vout as a fuel/ignition trim. This could either apply a trim to reduce timing and add fuel to ones WI map if the signal disappears or one could use it in reverse to add timing and pull fuel from the table in proportion to water flow. That way one runs a safe default map with timing and fuel adjusted as WI flow increases.
When I was looking at this a couple of years ago (been too busy to look into it over the last 2 years) the DDS2s output signal was too noisy - not sure if it has been smoothed yet or is the DDS3 has a smooth signal that can be used?