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Wide Band O2 & Boost Data Logging with X-Cal 2



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 I have managed to make my X-Cal 2 data log my Innovate Motorsports Wide Band Air Fuel sensor. This mod can be done for about $200. First you need to get yourself a wideband O2. I used an Innovate Motorsports LC-1 Wideband Control . You can order it directly off thier web site for $199.99. Next you will need to get yourself a 9 pin Mini DIN cable. You can either get it directly from SCT for $15 or you can order from StockCable.com for $7.95. My write up here will be using the cable from StockCable.com as the wire colors for the pinouts may be differnt. Also, this writeup only focuses on the wiring of the Wideband to the X-Cal and assumes you have already wired in your LC-1.

Innovate Motorsports LC-1


9-Pin Mini DIN Cable



 


Step 1: Trim back cladding on connector so it will fit correctly into the X-Cal 2.








 

Step 2: Cut one end off of your cable and strip back the cladding. We will only be using 1 wire for this mod. The green wire labled Analog 1 is the one you need to find. * DO NOT GROUND OR USE THE GROUND WIRE. We will adjust for the ground offset or difference in voltage later on.




Step 3: Connect the BROWN wire from the LC-1 to the GREEN wire of your cable.




Step 4:Route your cable under the dash. You may choose to run your cable a differnt way. Make sure you secure your cable so that if it gets tugged on that it will not rip the tiny wires. I used a few zip ties to secure mine.




 

Now that you have you Wideband cabled its time to setup your X-Cal 2 to data log your new input. Fire up LiveLink 3 and connect to your EEC and select Analog 1. Key on the car and start a data log. You will see a voltage value for Analog 1. Every car will be differnt so as long as its close to this you are good to go.


 


Step 5:Calculating ground offset...Launch LM Programmer (Innovate Motorsports) and select the Analog out 2 tab.



Next...change the high and low voltage values to 4 volts. Hit program and wait a few seconds. You will need to key off and key on for the settings to take affect.




Step 6:Go back to you LiveLink program. Since you key'd off and on for the Wideband setting change you will need to restart your data log session. You should now see a voltage value close to 4 volts. In my case I saw 3.974v


We can now adjust our formula to compensate for the differnce in gound sources. In my case there was a diffence of .026 volts (4.00 - 3.974 = .026) between my X-Cal 2 reading and what the LC-1 was outputting.



Step 7: Entering formula for Analog 1...double click on the Analog 1 and it will pop up the formula input box for that input. Enter your formula and hit Enter.


Use this formula --> ((V+X)*3.008)+7.35
X = your voltage offset...in my example my value for X was .026

 

Once you apply your formula you will now be seeing your actual A/F level. If you have the XD-16 gauge from Innovate Motorsports you can compare the readings. They should be identical.





Here is a sample data log from my car...

 

MAP Setup

First off you will need to get yourself a GM MAP sensor. I would suggest getting a 3 bar from the get go. A 2 bar MAP will only read up to 14.7psi where the 3 bar will read to 30psi. A 2 bar MAP will cost approx $40 and the 3 bar is $55. You can find them all over the net, ebay, summit racing, ect...

Step 1: You will need to find a 5v source to power the MAP sensor. I spliced into the factory EEC harness to get my 5v reference and ground. Pin 90 which was Brown/White is what I use for my 5 volt source and Pin 103, black/white, is what I used for the ground.

-= High Resolution Link =-








 

Step 2: Wire the MAP sensor into your SCT X-Cal2. I used Analog2 for my MAP input in this example. Tha MAP senor should be labled A, B, C. A and C are your power and gournd inputs and B is your senors output. Splice the center post (B) into the grey wire on the Mini DIN cable.



 

Step 3: Callibrate your MAP input. Make sure your car is not running but your key is on. Launch Live Link and select Analog2 from the analog inputs. Start a data log session and you will see a voltage for Analog2 if everything is wired properlly. You should see a value somewhere in the range of 1.5-1.6.



With no vacuum or boost your MAP should be outputing 1.62 volts. In my example I am reading only 1.533 volts. I will have to adjust for the ground offset with a custom formula. Use ((V+x)*8.97)-14.696 where x = 1.62 minus you measured value. In my example that would be 1.62-1.533=.087.

 

Here is a shot of a data log of my car running through the gears...25psi, 10:1 A/F @ 6500rpm.


-= HIGH RESOLUTION VERSION =-