JoeliusZ28

iTrader: (2)

I need to know how you wired the analog narrowband output signal from the LC1 to the car. I currently have mine going to the purple wire on the back of the PCM, and the narrowband is unplugged. and thats clearly wrong because its running like crap.

I just found this: http://www.audiohelix.com/tuning-documents/lc1/lc1.htm

however, my connector doesnt look like that so i am guessing that is LS1 specific. can anyone help me here id really appreciate it!!! car is running terrible right now!

Speed Density

iTrader: (38)

I run mine on its own circuit

JoeliusZ28

iTrader: (2)

lol honestly i have no idea what you mean by that... unless your saying you dont use it as a narrowband.

Speed Density

iTrader: (38)

I mean its wired in all on its own, nothing ties into the PCM or any other pat on the car except for a power/ground source.

What are you having trouble with on yours exactly?

Tony.

JoeliusZ28

iTrader: (2)

Ok yea, i wouldnt be having any problems if thats how mine was setup. What i did is I got rid of the passenger side Narrowband oxygen sensor and replaced it with the wideband. The controller has an analog output wire for a "narrowband simulation." I figured this meant i could wire it to the PCM as a replacement for the narrowband. So right now there is no sensor plugged into the stock passenger narrowband harness, and the LC1s analog output is spliced into the PCM. (purple wire C8).

Either my setup is not working, or my LC1s calibration is way off... and ive recalibrated it 3 times. (i did some logging, and with the conversion formula it seems ok, im running 11.5-12.5) When driving I cannot cruise at the normal part-throttle... it just bucks and sputters until i give it enough RPM to go into open loop.

roadtrip120

iTrader: (29)

I'm running the lc1 , with both front O2's separate. The O2's are tuned out so the car stays in open loop all the time, results of a huge solid roller.

The wideband is tied into the A/C pressure switch so when logging with Data Master i can view my Air Fuel Radio.

rkinney

How did you set up the Lc1 to to work with a/c pressure sensor. I have found some info on this, but nothing concrete. I have the LM-1 so it would probably be the same or similar.

JoeliusZ28

iTrader: (2)

I can help you guys setup your widebands through the AC sensor. I promise a writeup as soon as i get mine working 100%

Speed Density

iTrader: (38)

I would run the LC1 as a wideband and not narrow. Keep your O2's and run the wideband as well.

The AC trick is baller, lots of guys are doing that latley.

roadtrip120

iTrader: (29)

http://www.camaroz28.com/forums/show...band+stock+pcm
(copied from CZ)
Hi there,

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 <Click to Assign>. 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.

I hope this writeup will benefit for some people and make WBO2 tuning a lot more easier.

If you have some question, please feel free to ask.

Later,
Victor
(Copied from CZ)



Brown wire off wideband goes to Red/Black off A/C pressure switch

Type in the conversion numbers in Datamaster 3.5.1 (3.5.1 only, 3.4.1 will not work) and you are good to go.

Brady

JoeliusZ28

iTrader: (2)

so do you think the "narrowband simulation" function is BS? I was trying to avoid dropping my y-pipe and welding a bung.

As a side note i drove to my buddies house cause he thought he could fix it and he's stumped too. let me tell you, this thing is DRINKING the gas right now... ive never seen it suck this much gas in the 5 years ive owned it. at 3.99 a gallon im afraid to drive home tonight!

I just calibrated the output of the LC1 which i didnt have right, but it still didnt fix it.

roadtrip, ive actually had that thread bookmarked for a while. Im not having any problems logging wideband data, im having trouble with the narrowband simulation.

Speed Density

iTrader: (38)

You basicly have a lopsided O2 reading.

The LC1 works best as a wideband, you should just take the time and run it correctly. I dont see an immediate fix for your problem.

Tony.

JoeliusZ28

iTrader: (2)

alright ill yank the y-pipe tomorrow and get er done. thought it would have been better this way but oh well.

JoeliusZ28

iTrader: (2)

actually i dont want to give up on this yet. an 02 sensor connector has four wires. Ive tried tapping into both the "high" and the "low" signal wire. Is it possible that because i dont have a sensor plugged in, the computer is just defaulting to a value of 450? (crazy scale that datamaster uses, other narrowband fluctuates around 800). Do i need to tap the narrowband signal into both the low and high PCM inputs? Why are there even two signal wires? Ive just been playing a guessing game here.

stfuad

If your connecting to pin c8, I believe you said. Than that should be the driver side signal wire. So if there passenger side is unplugged and your tapping into the driver side than that should cause some problems. Correct me if I'm wrong here. Unless you tapped into the wire at the o2 sensor plug.

Just thought I'd put that out there.

Formula350

iTrader: (3)

That's what I got out of it too, that the Pass side isn't hooked up, but maybe he ran 1 lead to the Driver and 1 to the Pass and so both are hooked up, but are running off the same O2.

I'm curious about this whole AC Pressure thinger. I don't quite understand what's going on here heh.

JoeliusZ28

iTrader: (2)

are you kidding me? I read from a very knowledgeable cz28.com member that it was the other way around.


Doesnt matter now, i welded up a new y-pipe (much better than my old one) and am running the 2 narrowbands as stock now.