Quote:
Originally Posted by msc
If your DX is stock DPFI your going to need to monitor both injectors.
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It's not. Over the years, I've gone from stock DPFI D15B2 to a D16A6 with DPFI, to D16A6 with MPFI, to a D16Z6 with OBD-1 conversion.
Quote:
Originally Posted by msc
For the input zener diodes I would go with a lower voltage then 5.1 volts. Anything between 4.0 and 4.5 volts would be a better choice. The purpose of the zener is to limit the input voltage below the supply voltage so something less then 5.0 volts should be used.
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Agreed, but in practice the voltage never hits 5.1 volts. When I bench tested the circuit with a 50K resistor and 5.1V zener, I could max out my power supply at 31-point-something volts and the voltage at the test point (the uP input in practice) only hit about 4.9V. I believe the rated voltage is at the diode's rated maximum current. I was using a pretty hefty zener current-wise, so the trickle of current through the 50K resistor at 12V was nowhere near that limit.