I read an old link on another forum where a guy wired a Innovative LC-1 Wideband signal into his AC pressure signal which allowed the TTS datamaster tuning program to read a wideband signal. Seems straight forward. Just curious if anyone has done anything similar for tuning there C4's.
If I can post the link I will. Andy? Can I? Its not the CF forum.

Mseven can give you more infos on doing this a different way.
I'm also about to do this, but I'm only working on the car
on my spare time, so it may take a while.

There is a hacked .bin file for '730 ECM that will make
it possible to connect WBO2 to MAP2 input (not used on
stock ECM) and log WBO2 signal in IAC min. field in
Datamaster if I'm correct.

What ECM are you running?

Feel free to post the link.

But I like sliding's idea of using an unused port as opposed to hacking into the a/c wiring.

Matthew

Here is the write up from camaroz28.com

"Since I have not seen or heard of any actual information on how to log WBO2 signal thru the stock PCM with Datamaster, I decided to share my knowledge and do a “tutorial” kind of writeup on this subject, the way I have made it to work.

Please note, that I don’t take any responsibility for this information, and this is applying to the Innovate LC-1 wideband setup, which has a linear, programmable 0-5V analog output. If you have a different WBO2 controller, you should check for these features, and you should recalculate the equation below with the relevant AFR vs Voltage figures.

The purpose of this project is to log RPM and other relevant engine data with WBO2 signal at the same time, in the same program, so it would enable to plot a synchronized AFR vs. RPM table for WOT fueling calibration.
There are different ways to log these parameters with so called “aux boxes”, but since I was too cheap to buy the extra (and way overpriced IMHO) rpm signal stuff, and didn’t want to deal with too much extra cables and connections, I decided to give it try thru the stock PCM.

So, here’s a list of equipment you will need:
- OBDI ALDL cable (from akmcables.com or moates.net)
- Datamaster EE from TTS (a trial version can be downloaded at ttspowersystems.com)
- WBO2 controller with programmable, linear 0-5V analog output. (your choice)
- computer (obviously)

We need to feed the 0-5V output of the WBO2 controller to a 0-5V analog input in the PCM. The best choice is the A/C pressure sensor, since it is not used for normal engine operation, and most of you have probably already deleted A/C.
After you have wired in the wideband controller and it is fully working, hook up the wideband controller analog output signal wire and the analog output ground wire to the relevant A/C pressure sensor connectors. The unused sensor connector can be used for a really clean install.

Now comes the tricky part. If you check it in Datamaster, the A/C pressure field will show PSI values which we’ll need to convert to AFR. According to the datastream information for ’94-’95 LT1 F-cars, byte #30 is for A/D RESULT FROM A/C PRESSURE TRANSDUCER. This byte reports raw data called “N” which we’ll need to convert first to Volts, then to AFR.

Conversion function according to the datastream information is VOLTS = 5N/255, from which we get the integer VOLTS= 0.019608*N.

Now, that we’ve got the conversion of raw data to volts, we need to figure out the relevant AFR values. The default analog output of the LC-1 is 0V=7.35 AFR and 5V=22.39 AFR.



Since this is a linear output, we can easily calculate the relevant graph equation, which is AFR=3.008V+7.35.

Note: if you have a different wideband controller with different Volts vs AFR relation, you need to calculate the correct linear equation!

Replacing V with the integer above, we get AFR=(3.008*0.0196)*N + 7.35 which equals AFR=0.05896*N + 7.35 ; this function will convert raw data N to AFR.

Now we need to program and display this information into Datamaster, for which we’ll use the Custom Data feature. Click View > Custom Data. On the “Custom Engine Data Display” panel, double click on the first row . Fill in the following definitions in the Data Definition table:



- Check “Variable Enabled” box, this will enable to display our custom engine data
- Byte Number: 30, this is the byte # in the PCM datastream responsible for A/C pressure raw data “N”
- Information: Air / Fuel Ratio, or anything up to you
- Variable Name: Wideband O2
- Units: AFR
- Gain: 0.05896 ; this is the value from our function above to multiply with raw data “N”
- Offset: 7.35 ; this is the offset value from our function above that is added to the Gain integer
- Data Type: INT ; select this as this value is an integer
- Display Format: 0.00, this will show values of up to 2 decimals

Click OK, you are done!

You are now able to see WBO2 AFR and RPM at the same time, with all other engine information. Use your favorite dyno tuning spreadsheets to determine new values for the PE tables.

And Link:
http://www.camaroz28.com/forums/showthread.php?t=535603

Quote:
From what I read, you just unplug the AC switch and put the wire/s into it as a reference. But if there is another place to tap the signal, great.

There is also one downside by doing it via AC.
You won't be able to see the result in the graph
with rpm, MAP or other signal that you'll like.
The wbo2 will be only visible in separate window,
since it's a custom data.

I'm not 100% sure about this, but when I was playing with it,
it worked like that.

Quote:
If you doublick on the graph selections you can change it to read the "AC" data , which is the wide band data as you changed it. This is after you changed the custom data to reflect changing/converting the ac pressure to read actual wideband vice the ac. It does show the AC pressure in the graph now as I tried it.

In that case, going with the "AC" way seems like
a better (more simple) way to go.

Do you allready have WBO2 and if you do, which one?
Please post some results when you get everything running!

Quote:
I am trying to get an LC1 from a guy out here in Hawaii.

OK, keep us posted!

BTW, I've bought my C5 calipers from Hawaii.
And I live only 8000 miles away!