LC-1 connected to AC sensor

[danthurs]

I had removed my AC compressor some time back, so I have a open sensor wire. I connected my LC-1 output wire to it and I get raw volts. I can't seem to configure the PID to display this information as I want. I need to have each .3324 volts be 1 in the AFR and add 7.35 to that. That should display my AFR. Am I missing some simple step here? I can't seem to find it. I'm using the AC sensor. Thanks.

[GTPNoga]

Search for 5_liter_eater. I think he did it with the AC too..

[danthurs]

Thanks, I'll do that. Looks like your a bit to my south.

[5_Liter_Eater]

PM replied to. Most if not all the info you need is here:

http://www.hptuners.com/forum/showthread.php?t=9448

[danthurs]

Looks like I got it working, took a lot of playing around, and the fact I tapped in to my yellow wire instead of the brown one. Here's a scan showing wide band. I have one histogram that's not working, can't figure out why, I'm sure I missed something stupid. It's the WB AFR error. Any help would be appreciated. Now I just need to learn how to use this data. Any references? Thanks

If I'm reading this right, my ratios drop right around the time the MAF gets to about 8000 and that's where I'm getting KR. Is it possible I'm running lean here? The O2 is about 920 or a little less, and the LTFT is about +3.1 If I up the MAF table from about 7500 and up do you feel this would help? Or am I looking at this scan wrong?

[5_Liter_Eater]

The bummer about user defined PID's is they are not kept in the log or config file, so no one can see your AFR related PIDs in your log. You'll have to post screenshots. I can sort of see it because my user defined PIDs are AC based but my equation may be different than yours. It doesn't look like you are logging commanded AFR. That is required for AFR error.

[danthurs]

You are correct, I missed that one. I'll have to run a scan again. Thanks. See, I said it would be something stupid.

[danthurs]

The bummer about user defined PID's is they are not kept in the log or config file, so no one can see your AFR related PIDs in your log. You'll have to post screenshots. I can sort of see it because my user defined PIDs are AC based but my equation may be different than yours. It doesn't look like you are logging commanded AFR. That is required for AFR error.

Here is a screen capture.

[5_Liter_Eater]

You need to add "Air Fuel Ratio Commanded Low Res" to your table. Then your custom PID for AFR error will actually be able to calculate the difference between the actual AFR and the commanded AFR and be able to tell you the % error.

[danthurs]

Got that, thanks.

[nick13618]

whats the difference between hi res and low res?

[5_Liter_Eater]

i guess the sample rate but it's just commanded AFR; It'll either be stoich or PE so I don't see the need to waste the extra scanning bytes on the high res one.