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Calculating Injector pule width

EFI Tuning Fundamentals

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Using Vipec V88 want to do a manually calculated Injector pulse width for my initial fuel tables (water craft, Dyno not possible) for these purposes do I use standard conditions as my basis for Air density calculation or do I use my current actual atmospheric pressure based on location and then use 59 Degrees from Standard conditions even though my current location is 85 degrees, my thinking is that the ECU will correct for the Temp?

If set up properly ECU would always compensate for any changes in temperature and pressure ( if speed density system is employed). What ECU doesn't compensate for is humidity which could be a crucial factor in water craft performance...

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