Black 91 Z28

Hey,

I was curious why there were no WB Patches for folks using WBs with linear output? Reading on Mike's site it seems that he refrences a 2D table to convert the WB voltage to an AFR. Couldn't those patches just be recompiled with a different 2D cable corresponding to a linear variation in voltage?

Or, since this table already exists in the patched bin files couldn't someone directly edit it?

Either way it seems like it'd be an easy change that would greatly help folks without the DIY WB.

I'd appreciate any feedback from anyone that knows the location of the 2D table in the code or of that would be willing to undertake this project.

Thanks,
David

Section162

I've been interested in this exact same thing. Unfortunately, I don't know enough about the programming to do it myself.

I'm using the Innovate LM-1. Seems to me, if someone were to modify the DIY-WB hac as you suggest, they would need to specify to potential users the inherent voltage-to-AFR relationship that the hac is assuming. For example, the LM-1's outputs are user-variable, so to work with such a hac, I think all LM-1 users would need to have their outputs set up identically, according to what the hac intended.

Aside from all that, I did something different. I used a variation of Mike's DIY-WB hac, that puts the raw voltage into the ALDL stream. Then, using TunerPro, I modified the ALDL definition to convert the voltage into AFR. I've been too busy to work on it lately, but I tested this about a month ago. I datalogged about 10 seconds or so of closed-loop idling, and the average computed AFR was 14.8, so I'm assuming that it works fine.

For anyone that might be interested, here's a thread where I attempt to explain what I did to convert voltage to AFR (it's about half way down):

https://www.thirdgen.org/techbb2/sho...hreadid=248629

MikeT 88IROC350

Well I read this post and decided to share what I have found. The output of the DIY-WB O2 is non-linear, as you all know, and for us LM1 users the numbers coming thru the ALDL dont line up with what is on the LM1 display. I have been using a low volts DC power supply to input some volts into the ECM pin D8, and record the AFR thru TunerPro. I have graphed the data, and tried to make changes to the hac, to account for the slope of the line. It seemed like i made some small changes, but he AFR went the wrong way!!

I have used some info from Mike D. and it has helped, but is not a simple task to just recalibrate the numbers. There are 2 tables that he used, and there are limits to the voltage in the tables, and resulting AFR. Seems like there is more resolution for AFR 10.0 to about 14.7, but higher up there is a big window. I made a few chips trying to get the numbers to match, but gave up on it.

maybe if I had that wicked Prominator or AutoProm it would help the process go quicker......

I can still just hit record on the LM1, and /also log data with the scan tool, then just compare data in time synch later.

I think what has to happen is for someone to re-write (or modify) the code entirely to accomadate a linear voltage relationship with AFR.

Remind you this for the $6E tdf with '165 based ecm.......

MTPFI-MAF

there is a thread here https://www.thirdgen.org/techbb2/sho...0&pagenumber=1 about WB02 patch for the $58-$60 code and there are a few different patches Here http://digware.lunarpages.com/digware/wb.html by Dig, so maybe you can contact Dig or modify one of the patches to work for your application, since he has a Innovative Linear Patch maybe it will help, Just my

Black 91 Z28

Thanks for the replies. After I posted I got to thinking and I came up with an equation that would convert the AFR that Mike's patch put out into the true AFR. It seems to work well at 14.7 and WOT. Theoretically, it should be good from 10-17.5.

vernw

iTrader: (2)

So, how would one go about getting his linear output WB data into his ALDL datalogging output? I've got the WEGO WB, but no connection into the harness yet (only to an LCD display for now).

Black 91 Z28

There are several "patches" available for inputing a voltage and having the computer spit it, or a modified function of it, out. The problem with the ones that are available is that they all refrence a table that is for a nonlinear O2.

What I did was download Mike Davis' WB Patch. I then set my WB to output 1.4V at a AFR of 10.08 and 2.9V at a AFR of 20.66.

Next, I used Tunerpro to log the data and edited the .ads file. Uner the "Target AFR" field I changed the Operation to Multiply and set the Factor to -0.037994 and the Offset to 34.78.

Compare the WB's LCD to the Output from the ALDL screen to make sure they're close to being the same. Besure that your WBO2 unit is putting out the right voltage. Mine put out 2.65V when it was supposed to be putting out 2.5V. In response I had to shift the voltage the WB puts out so be sure to check it.

vernw

iTrader: (2)

My WB puts out linear voltage, the AFR is calculated by the following formula:

(VOLTAGE * 2) + 10 = AFR

So, how do I go about connecting the VOUT on the WB into my harness so it can be read? What ECM pin can or should be used, and then how do I do the patch to make it something displayable and loggable?

Sure hope there is some way to do this.

I'll also verify the voltage output on my WB, especially since it thinks the right bank of the motor is running rich when compared to the closed loop readings the NB is giving the ECM.

FWIW, I'm running $8D speed density, I've tried 2 different new NB sensors (one Delco and one Bosch), and their is no obvious difference in the plugs between the 2 sides of the motor, so something is off somewhere.... hence my trying to get the WB output logged. I've also recalibrated the WB several times to no avail, it still says I'm running around 13 AFR while the comuter thinks it's stoich from using the NB.

Black 91 Z28

Check out Mike Davis' WB patch. I'm not sure of his site's link but its in the forum someone. The readme in there will tell you to connect the voltage to Pin A3. I suggest getting Traxion's AFRtuner as it will insert and remove the patch easily.

vernw

iTrader: (2)

I chatted with MikeD, and his stuff is all for non-linear WB sensors, so it won't work for a linear one.

Anyone else?