I know it can be done. I was reading a write up in the vette forum about using the Ac pressure switch or egr switch wires to get signal from your wideband to hpt using their standard version. Question I have is, who has done it like this, which wire do you use exactly, a (picture or schematic would be nice), also I belive I created the histogram correctly but messed up on the pid as its only coming up as 10.8 something constant. I could have it wired wrong too tho...

 

I used the EGR.

PIN 55 and PIN 41. Red is power and yellowis ground in this picture. Enable the EGR in the tune and then make your histograms.

 

So red was the output from the wideband and yellow just became a ground? Then use the required pid query for egr? Sound right?

 

There is a writeup on the hptuners forum for this i believe.

 

write ups are not that clear. basically im trying to wire this in on a 2006 with a mtxl wb. im gonna try it by going threw the egr. can someone correct my PID query for my mtxl. 0v=7.35 5v=22.39 which would leave me at ([PID.___]/.33)+10 ?

 

You have a 5v range to capture an AFR between 7.35 and 22.39, which is a range of [22.39-7.35=15.04].
5/15.04=.3324 this is your slope, volts per AFR. Or 1/.3324=3.008 AFR per volt.

So voltage from the PID will be the signal, 0v should be 7.35, this is your base offset.

Equation is [PID]/.3324+7.35

Or you could do [PID]*3.008+7.35

The PID will be whatever number the EGR port is. I recommend using EGR instead of AC pressure. If you dont use the AC pressure sensor, then you could overpressurize your ac system and something will blow (line, condensor, etc.).

 

alright im gonna wire this up and try it this weekend. hopefully it isnt freezing here and I can make some progress.

 

great info!