Err... Two questions:
1. Are you controlling supplementary fuel injectors or are these solenoids going to bleed boost? Just want to be certain, for issue 2:
2. O2 sensors on startup will read 0V as if it's running really lean. O2 sensors in closed loop/idle can possibly hit fairly low voltage when operating normally. Are you going to inject more fuel or bleed boost in these situations?
Optoisolators are really weak. You may have to use another external transistor (or darlingtons as posted earlier, which is the same thing) to amplify the signal a bit so that enough base current is drawn from the TIP42 to fully turn on the solenoids. But I'm thinking there's another, better way to hook up these power transistors for solenoids without the (expensive, and probably completely unnecessary) optoisolators here. However with the first two questions I don't know yet...
Oh, I guess since people are going off topic here, I'm a DSM'er and a WRX'er... though my faith in 4G63T has diminished due to my DSM's state...
1. Are you controlling supplementary fuel injectors or are these solenoids going to bleed boost? Just want to be certain, for issue 2:
2. O2 sensors on startup will read 0V as if it's running really lean. O2 sensors in closed loop/idle can possibly hit fairly low voltage when operating normally. Are you going to inject more fuel or bleed boost in these situations?
Optoisolators are really weak. You may have to use another external transistor (or darlingtons as posted earlier, which is the same thing) to amplify the signal a bit so that enough base current is drawn from the TIP42 to fully turn on the solenoids. But I'm thinking there's another, better way to hook up these power transistors for solenoids without the (expensive, and probably completely unnecessary) optoisolators here. However with the first two questions I don't know yet...
Oh, I guess since people are going off topic here, I'm a DSM'er and a WRX'er... though my faith in 4G63T has diminished due to my DSM's state...
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