So I wanted to make a fuel cut defender so I did my research, someone had one on here as well but now seemed to show you exactly how to do it. I will do my best to do so. Mine holds voltage at what ever you want. I set mine to 4.65 volts. I havent tested on my car yet because it isn't running at the moment but I did use 5v to the sensor via a usb plug, I tested it before the fcd and blowing into it put the sensor from the 4.75 to 5.02 volts so it sees "boost". After fcd was placed inline it changes volts with vaccum but when you blow into it it stays where ever you set "0 psi" to.
I used half the board and sanded it to fit the box. Also installed the potentiometer with the screw aimed toward the lid so you do not have to remove the board to adjust it.
Red dot is potentiometer pin closest to screw - connect to map signal ( yellow with black, pink dot)
green dot is the potentiometer pin furthest from screw. goes to ground
Yellow dot is potentiometer middle pin, goes to black stipe side of zener diode ( blue dot)
Purple dot is the side of zener with out black stripe, this goes to ground
Both top left pins go to a ground wire. They have to have a jumper in so the grounds are linked just makes it easy.
I used two grounds and I linked them together on the board. This allows me to cut the ground splice these wires one to each end. order doesn't mater.
I also used two map signal voltages ( linked on the board) for the same reason.
If you are getting too high of voltage turn the potentiometer counter clockwise
If voltage is too low turn clockwise
Also I used blue rtv silicone to "glue" the board to the case bacuse silicone is non conductive. Any questions ask, its hard to explain it and include everything, I hope its helpful.
#138026, "RE: Diy Fcd. Works perfect" In response to Reply # 2
I don't know enough about the subject or have I been down that road yet to really have much to say on it other than good job. I'm sure someone on here will find it useful at one point or another regardless if they reply or not.
