EFI Electrical Circuits...
(All layouts & circuits are under development and subject to change without notice)
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This is the final circuit of the Peak & Hold driver. Thanks to Jean Belenger, in Canada, for the circuit and for supplying the naked printed circuit board. Low impedence fuel injectors need a large current pulse to ensure that they open quickly (above 4A), which then needs to be very rapidly reduced to only 1A, to avoid over-heating. |
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The new ECU needs to be able to cooordinate the timing of the fuel injectors with the physical position of the pistons. To do this, it connects to the points in the distributor. However, that connection can suffer from significant electrical interferance, or "noise", which has to be removed, to avoid false triggering. |
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The initial setting-up of the Speeduino is easier to manage with an engine simulator. This circuit provides all the relevant engine sensor outputs and allows them to be individually adjusted for testing. It includes a ready-built oscillator board purchased from eBay. |
