Hey how's everyone doing? Just like the title says I have 97 383 with t76.... Looking in to purchasing autotap but concerned on how I will log boost and my wideband through my stock PCM... Some have said to use a/c pressure switch for the wideband and I have also heard I can use the oil temperature pin on my PCM to log the boost... Or vice versa.... My questions are where is the a/c pressure switch.... And what pin or wire would I tap for the ( oil temperature pin) on the PCM ... Forgive me for this but I would like to log everythng together and I am confused on how to do it properly.... Thank you in advance nick

edit. The car still has a/c

 

Search the forum.

 

xBaDaSs97z:
I'm interested too, though with a 95, for me the info would relate to OBD1 hardware/software. (Yes, I've searched too!)

 

Hey mikegyver thanks for the tip I have searched and also posted that I had found info on linking to the a/c switch and the oil temperature pin.. If you had read my post in detail you would have seen that.... I am interested in knowing WHERE the switch and pin is located and how to perform the task... I think the "use the search" response is for those who lack the experience and knowledge to answer the question properly... Thank you

 

Here is a pic of the A/C pressure sensor http://shbox.com/1/refrigerant_sensor.jpg . The red/blk wire sends 0-5V signal to the PCM depending on the system pressure. You have to put a switch on that lead so you can switch your 0-5V wideband signal to the PCM (pin C4-12) on the red/blk wire. Then reprogram the scanner/software to read that input port signal as AFR. You say you have A/C installed...The A/C will not work when switch is sending wideband signal to PCM and you may have some A/C DTC's to clear to get A/C back to normal after logging the WB. As far as oil temp pin, since it's not used on the F-Body the pinouts don't show what PCM pin it goes to. Maybe another model that uses the the same PCM number will list it.

 

I am also thinking of doing this. Are you saying connect both the black and the red wire to the 0-5v output on the wideband?

 

No, you cut the red/blk wire to the PCM near the sensor , then get a double pole switch, use the red /blk wire to PCM as the common, add the a/c sensor side of the red/blk to one side of the switch and the wideband output to the other side of the switch. When you switch it one way the a/c feeds the PCM and when you switch it the other way the wideband feeds the PCM. Hard to explain w/o a diagram.. Hardest part is to program the scan software to convert the wideband voltage to AFR. There is a writeup for TunerCat. Personally have not seen anything for ODB2, but have not looked hard..

 

I understand that totally.... Wondering is autotap will read it properly.. I blieve there was a write up or a conversion table of somesort to convert pressure... Now if I could only find. A way to log boost along with everything else I would be set....