Got answer
Since it a 4 stroke engine each injector is really only open ~25% of the time - actaully a little longer since you can open the injector before the valve opens. So total fuel flow rate is injector cc x .27 x number injectors or in my case 850cc/mim x .27 x4= ~900 cc/mim .
Since the HSV follows the injector timing it too is only open ~25% of the time but has to match the flow of all the injectors at the desired ratio of water/methanol to fuel.
900 x .2 / .27 = 660 cc/mim or 2 of the 1.0 mm jets which sounds like a lot to me.
Too bad the FiA2 can't monitor 2 fuel injectors at same time or just double the pulse lenght to the HSV so it could go up to ~50% - this would give more uniform flow over time ?
Richard have I missed something here ?
Thanks Charlie
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