I already know that it can be done to allow you to log through the PCM, but will this in any way effect the operation of the A/C? My car is not currently running, otherwise I'd test myself and find out. I'd like to know if there is anything that would need to be enabled/disabled to make sure the A/C continues to run properly with the wideband O2 signal in it's place. Or if the A/C will run properly at all.

Also, does anyone have the forumla for converting the A/C pressure data to AFR? I've done a few searches, but haven't found anything.

 

If I understand correctly, the a/c wont function. Since you are taking away the signal for the pressure side which enables the compressor. We did a thread on this about a month ago. I couldnt find it in a search either. It discussed how you read the a/c as afr.

 

That's what I was worried about. I still want the A/C in my car to function. Perhaps I can find another PCM pin to use rather than the A/C pressure one. Thanks for the info though.

 

You should be able to unconnect it and plug the A/C connector back in. You aren't logging most of the time, only once in a while.

Dan

 

Running the A/C while datalogging for tuning purposes would be a bad idea anyway. Adds another variable.

 

A good point, I didn't think about that at the time. Perhaps I'll wire it up so I can switch back and forth between the O2 and A/C in the car. Shouldn't take too much, just a few wires and a toggle switch.