Wideband Question

[muddyjimmy]

Hello all. I am in the process of tuning my 94 F-body LT1/4L60e that has been transplanted into an 85 Camaro. It seems to run great on the mail-order tune but I just have a feeling that I can get it just a little bit better. I have ordered a Innovate MTX-L wideband and want to know if there is anyway that I can datalog it through TunerPro RT? I have read that it can be done on Datamaster through the A/C pressure sensor but am unsure on TunerPro. Any info would be great or just point me in the right direction if it has been discussed before. Thanks.

[EagleMark]

The value for Wide Band O2 sensor can be added to TunerPro ADX file easy if you have a way to get it into the ECM, like AC pressure wire or any unused A/D channel that we know where it is or does... do you know what wire to use for AC sensor?

[EagleMark]

I think we did this before and used the Corvette Oil Temp wire going into PCM, I already have it set for WideBand in the ADX file.

So D12 for AC sensor:
http://www.gearhead-efi.com/Fuel-Inj...9&d=1322081270

And D26 is oil temp for Corvette but you may need to add it to your bin file as an ALDL output?

[muddyjimmy]

I think we did this before and used the Corvette Oil Temp wire going into PCM, I already have it set for WideBand in the ADX file.

So D12 for AC sensor:
http://www.gearhead-efi.com/Fuel-Inj...9&d=1322081270

And D26 is oil temp for Corvette but you may need to add it to your bin file as an ALDL output?

The A/C wire is one that I left during my conversion but it would not be a problem to add the Oil Temp if that would be a better option. I do not know how to add the output or change the PCM/TunerPro do it will read correctly on the data. I have tuned a little with the TunerPro but am not familier with changing the code.

[RobertISaar]

oil temp circuit probably won't work. that circuit will likely have a 348, 1K or 2K pullup resistor on the circuit, it's meant for using with temp sensors.

D12(A/C Pressure sensor) should work fine, assuming you don't try to engage the A/C during any logging.

[muddyjimmy]

That should not be a problem since the a/c is no longer on the vehicle. How would I set it up so it will datalog AFR instead of psi? Is there a conversion in tunerpro that I can make?

[PJG1173]

you need to edit the values in the ADX. a good example is the 217_0D_v250.adx
It uses the following conversion for the WB02
X * 0.039063 + 10.000000

[muddyjimmy]

That is the conversion equation I need to make the wideband read correctly in TunerPro? If I remember correctly, when poking around in the "edit ADX" file, I did see an area to insert a new conversion.

[RobertISaar]

the exact equation will depend on what your wideband controller outputs. the version posted is for a controller that outputs a 0-5V signal that corresponds to a 10:1 to 20:1 AFR range.

[muddyjimmy]

Ok thanks for the information. The Innovate MTX-L has the 0-5 volt output that I was going to use at 7.3 - 22.x AFR range

[EagleMark]

Same as the LC-1 wideband. This ADX is set up for those settings, let us know how it works!

I'll attach the XDF if you do not have it, it's set to work with the ADX for Data Tracing.

New ADX and XDF files uploaded, old files downloaded 376 times.

[EagleMark]

Conversions for 256 bit 0 to 5 volts!

For the LC-1 WideBand 0V = 7.35 AFR and 5V = 22.39 AFR.
AFR of 7.35 to 22.39 is a difference of 15.04 divided by 256 = 0.05875

Conversion for this would be:
(X * 0.05875) + 7.350000
Adding the offset makes 0 volts 7.35 AFR

For other Wide Band controllers that have 0V = 10.00 AFR and 5V = 20.00 AFR.
AFR of 10.00 to 20.00 is a difference of 10.00 divided by 256 = 0.0390625

Conversion for this would be:
(X * 0.0390625) + 10.00000
Adding the offset makes 0 volts 10.00 AFR

[muddyjimmy]

Awesome information guys. This is what I am looking for. I will try it out in the next few days and let you know how it goes. Thanks again.

[PJG1173]

I have the MTX-L also. you need to change the settings for the 5v analog output to reflect 10-20 AFR. I could not get it to read accuratly using the default settings on the MTX-L. tunerpro would was always read .5~1.2 AFR off even after recalculating the conversion. another thing to keep in mind is make sure it is grounded to the same ground as the ECU.

[Six_Shooter]

You can adjust the output of the LC-1, to be 0V = 10 AFR and 5V = 20 AFR, and if I'm not mistaken, then LM-1 can be adjusted the same.

These conversions would assume a linear output as well.

For a WB that uses a non-linear output a table would need to be used, to show AFR.