Been trying to find a way to record multiple boost locations with hp tuners pro.
Figure it has the inputs on the side but no luck finding a gauge or map that I can add and record the differences. Like w/b it was a single wire hook up. Tell it what it's looking at and good to go.
But this seems to more then just that easy.

Any suggestions?

 

Just need a 0-5v pressure sensor and have the output to the hpt box. You will have to calibrate them, or take the sensor range directly.

Something like this

 

That's what I thought. But the sensor I have here needs 5volts to it.
Read not to piggy back off other 5volt wires.
I see some 12volt in to 5volt boxes. Not sure the quality of them.
A sensor that was 12 in and 0-4.5 out would be nice.
Still hunting.

 

I wouldnt think twice about pulling off one of the existing 5v sources, its not like these sensors draw any current.

Or if you insist on a pure 5v source,

 

I have four temp sensors running off the +5V from the now re-purposed EGR circuit. Three of which are going to the EIO on HPT, the other back thru the EGR reference signal to the PCM.

To use a resistive sensor (ie, one or two wire) on HPT EIO, you will need to build a pull up circuit so you are actually reading the voltage drop across the sensor. If the sensor is three wire (+5V, GND, Reference) the pull up circuit is built into the sensor and the Reference wire would go to the HPT EIO. Of course you will have to tell HPT what to do with that reference voltage, rather it be a liner slope, lookup table or polynomial equation.

 

Ok. Thanks. I'll look to see if this truck had an egr. Line. It's been awhile since I took it apart.
Yes the psi sensor I have is 0-59 3 wire
5volt ground and reference out.

 

No egr on this truck.
What do you think would be another 5 volt choice? Maf maybe?

 

Pretty sure even if it didnt come with EGR installed the 5v pin is still active...

 

I went and tapped off the map.
Seems to work. This sensor shows
0= 1.88 volts
15= 4.36 volts.

Now I need to figure out how to get hp to translate that across.

 

That with the engine on or off? You want to test it with the engine on preferably as the alternator will increase system voltage from the battery.

Assuming you 60psi sensor is perfectly linear across 0-4.5v

Pressure = (60/4.5)*V+0

So Pressure=13.33*V

To really calibrate it you need to measure the pressure at 0psi and at 60psi and a few points in between as that will change slightly.