pikkashoe

Hey gentleman,

I got my dash logic installed and working.
For those of you running fuel pressure sensors, how exactly do you install the sensor to the Dash logic.

The fuel pressure sensor has 3 wires (red blue and black-ground). Now my question is, where do the wires go, since the dash logic has only one input per sensor plus the ground input.

So do both the red and blue wire go into the AD1 slot on the dash logic?

Matt @ FSP

Hey bud... Check your texts

pikkashoe

Hahaha thanks

Unreal

One is power, one is ground, one is output. Wire output (blue) to dash logic, red to a +5V, and black to ground.

pikkashoe

Ok all wired up. Thanks for the help.

Now, big the question is, how in the world do I make it work.

I know I have to create a pid and enter a formula to convert the data into useable data in the dash logic configuration program. Thats where I am stuck.

I am using the aeroforce interceptor 150 psi fuel pressure sensor.
What formula do I have to enter in the dash logic configuration screen for it to work???

The aeroforce website doesn't really have anything on a formula, only that the slope that needs to be used is 37.5 and the intercept is -18.8

Unreal

That is in the aeroforce sensor manual. It gives the slope and intercept, just a 0-5V linear sensor.

Fuel pressure=37.5*(input voltage)-18.8

pikkashoe

How would I enter that into the dash logic.

Reading the guide on dashlogics website, it says it should be in this format:
(pid(10001) * 40). Thats the example given.

So I guess it should look like this: ((pid(10001) * 37.5) - 18.8)

Those that look right?

Unreal

Yep, looks correct.

pikkashoe

Thanks. What should I be seeing for normal Fuel Pressure at idle, just so i know its working.

Unreal

If it is a stock setup FP should always be 58psi or so.

pikkashoe

Yeah its stock fuel system, its reading between 56 to 57 at idle.

Streetk14

For what it's worth, the slope and offset for that sensor should be 36.25 and -18.1. There was a printed instruction paper that came with my sensor that listed these values. Then I went onto Aeroforce's site, and it listed the ones you mentioned.

At first, I thought I was going crazy. So I emailed Aeroforce, and they told me to use the ones in the printed instructions. I politely mentioned that they should update their online PDF file to reflect this (maybe 4 months ago), but they still haven't done so.

Might want to try those values instead.

pikkashoe

Hey street, I also noticed that late last night, the online formula is different than the one in the documentation received with the sensor. Mine actually is different than your figures as well, if I recall, mine called for 37.5 and -18.4. I will email them to see what they say, apparently they have changed the sensors a few times, as there are some 5 v and 12 v sensors out there.

Unreal

Use whatever the printed instructions say. That being said, if it is readin 56/57 psi it is close. That is within the error of the sensor and factory FPR. Now setup a warrning so if FP <52 or something the car says something funny like "Yo dawg, fuel pressure dropping"

Streetk14

I'd just follow whatever your printed instructions say, and make sure you use the correct set of values. They include two different sets of numbers -- one to use with the resistor they include, and one for use without the resistor.

On my instruction set it shows: With resistor - 36.5 / -18.1
Without resistor: 36.25 / -18.1

I didn't use the resistor as they say it's only needed when used with the Aeroforce gauge. Mine is all wired up, but I haven't actually mounted my sensor yet. So I can't tell you what mine reads at idle. I wanted to mount it to my LS9 fuel rail, but found the sensor would hit the hood. Just need to order an inline fuel line adaptor. Maybe I should do that right now.

I'd like to hear what Aeroforce has to say, though. I know they had problems at one point with sensors failing, but I thought the resistor thing was supposed to fix that. Either way, it would be nice if they had the correct data on their site. Probably doesn't make a huge difference, but I want it to read as accurately as possible.

realcanuk

I am using the Aeroforce sensor and gauge for 2 years now with no issues. I did use the resistor. I don't remember the values but I did use what Aeroforce said to then.

Sensor mounted .....

pikkashoe

Unreal, thanks for that suggestion, I definitely will set up an alarm for that.
What other alarms do you have set up. I could only think of one other one I wanted at this time, coolant temp over 220. Im not too familiar with boosted cars, so not sure what other alarms would be beneficial to set up. Any suggestions are appreciated.

Unreal

Knock retard >2 while TPS >80
IAT >150
AFR>11.5 while TPS >90
Boost > 30psi displays danger to manifold (just for fun)
FP<55 while TPS>100 (i run a rising rate so it is 50-51 at idle but should be 57+ whenever car is floored)

Streetk14

Just gotta watch out for the metal plate on the floor that rattles loose when that warning comes on, right?

pikkashoe

streetk14, they finally responded. They said 37 for slope, and 18.4 for intercept, completely different from the online documentation and the paperwork I received.