So these are the questions/concerns I have. Down the road I would like to change this from an open loop to a closed loop setup and swap out the 555 for an Arduino and add a MAP sensor to read a value in and use a PID loop to actually target a boost pressure and not just a duty cycle. So although they say "if its not broke dont fix it" I would like to learn from my design mistakes and try to build a better device. I have soldered this together on a breadboard and have it running in my S10 and have not ran into any issues yet. I have the valve running at around 20Hz and with a 100k POT I can adjust the duty cycle from about 6-88% which is outside of the effective range that the valve actual functions (~14-78%). Basically to see if there is something I missed or obvious that I should change or should have designed differently. I have some questions and wanted to get feedback on this circuit I have put together.
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