Adding Wideband o2 Logging to 7730/DF Code

[jmgtp]

I'm at the point where I want to get my tune dialed in better. It feels pretty good now but I can't seem to escape some KR in the 5-7k rpm range and I just know there are more ponies waiting to be unlocked. I want wideband logging to get a better look at the fueling side.

I believe it is possible to log the data from the wideband through the ecm but I don't really know the specifics and that is why this thread exists.

From what I understand of the hardware side, the 7730 should have an unused pin that I could connect the wideband output to. That would be the easy part, I'd just need to know the which pin.

The software side is what I don't know about. I use TunerPro RT for logging. I'm sure I would need to add something/mod it somehow to read the wideband output. BUT, does my bin need to be modded as well in order to feed the wideband data out the aldl serial port?

Has anyone done anything like this? Ideally, I want to log the wideband data along with the rest of the ecm functions so I can have a nice picture of everything at once. Should it matter, this is a 3.4 LQ1 on DF code in a W-body.

Any help/input appreciated!

[Superdave]

Your bin needs to be "hacked" to be able to send the data from that port to the datastream. On the tunerpro side you'll have to edit the .ads to add what byte number to look for.



Adding the code to the bin file isn't too hard, it's just finding someone who knows how to do it.. and not screw it up. lol

[ForcedFirebird]

That's been big discussion on thridgen.org. There is a way to do it using a hacked code and the .xdf and .ads files are available for it. Look up ARAP, AYAPWB, and S_AUJP V4 for more details.

[Superdave]

I've been messing with BCFA $DF for a while, the .xdf i have needs alot of work but i'll try and see if i can get wideband logging to work on it..

[ForcedFirebird]

What input pin is used if one wanted to do this with a '7727 or '9396?

[sil]

maybe you could use the corrosivity sensor input?

[Superdave]

IF my car starts tomorrow on this bin, i'll let you know what pin to use..

[CNCguy]

On the three wheeler with a '9396, I used the input for the A/C pressure switch (don't remember which pin). IIRC, it reads the Zeitronix nonlinear 0~5vt output and I created a lookup table to convert to A/F ratio. I haven't had time to finish my tuning but it seemed to work good.

[jmgtp]

A lot of this is going over my head, so please be patient with me and keep it coming. I appreciate everyone who has chimed in, you guys are very knowledgeable.

ForceFirebird, I'll check out thirdgen.org tonight and see what I can learn/find there.

I wouldn't have the first clue how to add it to the bin. My skill level is 'newbie' on the the tuning side. I use the xdf available on the site and can make changes through TunerProRT. Things I have successfully changed are idle speed, fan temps, iac counts, etc. I leave the tuning of fuel/spark to the pros - Ben in this case, where I am sure I am frustrating him with our long distance tuning effort. I have successfully added constants to the definition file by referencing the df code document - the only ones I have added so far are in relation to the operation of the shift light, whose output I use to energize a relay that powers an electric vacuum pump. Maybe there are some unused pins in the ecm that would be used for the 4t60e?

The hardware side of this will be easy for me, I can weld in a bung for the wideband and route the wire to the ecm pin no problem.

[jmgtp]

CNCGuy... I looked at your .ads and I see the lookup table but can you explain more on how it works?

Am I correct in saying you used an existing pin in the ECM meant for another purpose (the a/c pressure switch) and fed the wideband directly into that pin. The lookup table you created translates the raw data into AF ratios. But, where is the data available when logging? Does the a/c pressure switch status display an a/f ratio now? Can you log it to a CSV file? This route sounds like it may work well for me, though I still have my a/c and I am not willing to part with it! However, my car is a 5sp and I imagine the 7730 must have some pins that are dedicated to 4t60e, maybe something like that could be adapted.

ForcedFirebird, I did some searching on thirdgen and found what you had referenced but this is all sailing clear over my head

[CNCguy]

I am no expert by any means and it has been a couple years since I worked with it but will try to explain the parts I remember. I will say that I had no prior experience and was able to work my way through it by reading info online.

My wideband only has a nonlinear output so I chose to do the lookup table. IIRC, the ECM reads the input voltage (0~5) and outputs it in 0~255 format. The .ADS file reads the data stream, selects the data it needs and converts it to a format you can understand. The ADS file I posted has that info edited into it. When the WBO2 outputs 2.5vts, the ECM reads it and outputs 127 to the datastream. The ADS reads that block of information, looks it up in the table and displys the converted A/F ratio. It is displayed as "Actual A/F".

As for keeping your A/C, no problem. I don't know why you couldn't just unplug the A/C pressure sensor and use it for the wideband while tuning. When finished, just plug it back in. The A/C just wouldn't work during tuning. Pin F14 is the one you need. There may be other pins that would work but I am not the one to answer that question.

[Superdave]

Sorry, i haven't had a chance to test my bin file. Just finished some exhaust work so now i can work on tuning again..