yeah... i thought about posting it in there, but i was afraid that it would just get moved into the turbo section...

update:

my dad hooked me up with this guy who's a circut designer, he helped me make my circut and had a better way to do it.





pretty confusing, i know. basically, he suggested that i create a 1.8 volt refrence voltage (adjustable in the future with a variable resistor to determine the "go into open loop" point) using an IC, part number "ADR291", i think it's either an Analog Circuts or Teradyne part number. that, along with the pressure sensor voltage is sent into the compariator IC, part number "LT1011". this outputs a voltage (high or low, still need to find what the output will be) which is fed into a driver transistor "2N3904" that supplies enough current to click on the relay to make things happy. everything in the circut works off of 5 volts, which is supplied by a generic 12 to 5 volt regulator.

2016 WRX STi Limited (current)
2001 A4 1.8tqms (donated)
1991 GVR4 #1933 (sold)
old.dsmregistry.com/detail.php?carid=218 (dismantled)