W/B 02

[god910]

So somehow I am part of a Grand National list and got an email about a group buy for a W/B 02 meter.  The buy is over but the savings was only $34 so it's not like It'll kill me, but I was wondering if you guys could take a look and tell me what you think.  http://www.innovatemotorsports.com/lm1.php I posted this here because I am going to tackle the fuel tables when the new motor goes in this winter.  I need a W/B to do this right.  And IIRC this is cheaper than the Lambdaboy (I was thinking it was over $500)  So some input would be great.  I planned on buying myself a W/B 02 for my x-mas present to myself (I've been working straight days, and will be until the 23rd.  (When I get 2 weeks off paid.  UAW weeeeee!))  Thanks in advance.

[Mick]

Seems like a lot of $$ to me when you can make your own for about half their asking price.  Not quite as feature packed, but then all you really need for tuning purposes is a WB signal output into the PCM.

If you have checked the GMPCM website recently, you may have noticed that the software now includes a code patching feature.  There are also several patch files available for download that modify code for wide band oxygen sensor input directly to the PCM, so that the WBO2 signal data can then be obtained from the ALDL scan stream as the "Desired Air Fuel Ratio" value.

A wide band O2 signal will be of optimal use in adjusting VE tables when the signal can be easily referenced to both RPM and load (MAP). These particular patch files provide this capability.

If this feature becomes popular, we will likely release a wider selection of WBO2 patch files that would include applications such as the 1227727 8F.  They are quite simple to use, as they only require a few mouse clicks to apply.

A patch export feature is also available that allows one to generate a new patch file from modified code with point and click ease. :)

[skalor]

Mick, that's exactly what I've been thinking about the last couple of days.  I haven't started altering the 8F codeset yet, but I plan on utilizing your GMPCM program as it has a lot of good features.  Plus, the ability to utilize a WB02 would be ideal for all those guys that want to use the 8F codeset for their custom setup...and I'm one of them.  8)  :D

[TGPilot]

So the GMPCM has intergrated a WB O2 application? And it would be viewed through the ALDL connector? Cool!

Would this WideBand 02 sensor be in place of the stock 02 sensor or would a bung need to be welded downstream somewhere to have it as a seperate entity?

Maybe you could break down (in advanced lamens terms) the theory of operation you are speaking about for an idiot like me? :oops: :lol:   8)

[Mick]

Actually, it?s even a bit complicated for me. :)

Here is how it works:

One would acquire a wide band oxygen sensor setup, either by purchasing one of the pre-made units or constructing their own.

Note:  The wide band signal is different then the normal band oxygen sensor that GM uses, so you would need to either install an extra bung for it, or use the "in tailpipe" approach.

The signal circuit from the wide band is pinned into the PCM at the connector plug, where on some applications it would replace the fuel pump voltage detection circuit, while others use an unused pin.  The correct pin for the specific code patch is indicated in the patch files description.

The code patch modifies areas of the binary that are typically not mapped in a definition. These areas are the "executable" portion of the code, also referred to as the algorithm section.  For example, some patches remap the TPS2 pin input into the "Desired Air Fuel Ratio" display after converting the signal from the raw 0-5 volts to a corresponding air fuel ratio value.  You can then read the wide band oxygen sensor as air fuel ratio directly at the "Desired Air Fuel Ratio" slot, using any scan tool or laptop ALDL scanning setup.

When you acquire a log or snapshot of the ALDL data, this data will now include the new WBO2's air fuel ratio value along with the usual RPM and MAP values. Since the data has a direct correlation, it can then be used to easily modify the corresponding "RPM vs. MAP" areas of the VE tables in order to obtain an optimal air fuel ratio at all operating conditions.

A primary area of interest will be the power enrichment fueling tables, as this is where the PCM reverts to open loop mode (i.e. does not use normal band O2 compensation to obtain a proper A/F ratio).

By setting the minimum temperature for closed loop operation to a value higher than that normally seen by the engine, one can also optimize the VE tables and parameters that the PCM uses to calculate A/F ratio during non-power enrichment operation quite easily.

Tuning using the above method is considered by many to be superior to the tuning capability one would typically obtain using a DYNO, as you can now address ?all? operating conditions at the exact load values encountered on the street, simply by driving around and collecting the ALDL data.

Collecting data at wide-open throttle can prove to be a challenge, if you live in a highly populated city. :)

[Tooky]

all you really need for tuning purposes is a WB signal output into the PCM.

If you have checked the GMPCM website recently, you may have noticed that the software now includes a code patching feature.  There are also several patch files available for download that modify code for wide band oxygen sensor input directly to the PCM, so that the WBO2 signal data can then be obtained from the ALDL scan stream as the "Desired Air Fuel Ratio" value.

A wide band O2 signal will be of optimal use in adjusting VE tables when the signal can be easily referenced to both RPM and load (MAP). These particular patch files provide this capability.

If this feature becomes popular, we will likely release a wider selection of WBO2 patch files that would include applications such as the 1227727 8F.  They are quite simple to use, as they only require a few mouse clicks to apply.

Hey Mick, I'm a registered GMPCM user yet I cannot find any 1227727 8F Wideband patch despite this post being 2 years old.  Did this ever happen?  What can I do to assist the development of a wideband patch?  Thanks!