I do not have a fp gauge right now and I need to start watching this. I have the fuel pressure sensor and voltage regulator for a aero force gauge. I am going to try to log my fp using this sensor and just running the 5v output into my hpt pro.

Has anyone done this? I remember reading about it on the hpt forum but no one gave the math formulas for the sensor. Any ideas or input?

 

Pretty easy to make it work. You need to measure the voltage output at 2 pressures (although more is better but not required), usually 0 and max of the sensor.

With fuel pressure at 0, record the output voltage. (lets pretend this is 0.01v)
With fuel pressure at [sensor max], record the output voltage. (lets pretend this is 4.96v at 100psi)

The really easy way is to plot it in excel and generate a linear trendline of voltage vs pressure and read the equation for slope and intercept directly.

The manual way is to take the derivative of the function (dy/dx, ie, rise over run) for the slope. And the offset is the voltage at 0 pressure.


With my pretend number above, the intercept is 0.01, and the slope is ((100)/(4.96-.01)= 20.2 psi per volt
So if you hook it up and it reads 3v, your pressure is (3-.01)*20.2= 60.4psi.

 

Well shoot. You make it sound so easy. Lol.

I'm going to try it out then. I can just turn my regulator up to get my high voltage right?

I have to use a 5v regulator for my alkycontrol map. Think it is safe two power two sensors off one regulator?

 

AEM has a FP gauge that has an analog 5v out. With a pro interface it's easy as cake.

 

All I have Madmann is the 15dollar sensor from an aero force gauge. This is definitely a cheap route for a fp gauge if it works.

I got this figured out last night. This should be pretty easy. There was even instructions with the sensor that had some of the math formula with it.