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Thread: Wideband setup through apu1

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    Wideband setup through apu1

    I'm trying to get my wideband setup through my autoprom. It's model aem 30-0300. I have tried to setup my adx multiple ways as per Mark's tutorial, but can't get it to read right. If anyone has any ideas please let me know. http://www.gearhead-efi.com/Fuel-Inj...up-in-TunerPro! This if the link I'm following to set it up. Thanks fellas
    Dustin
    Attached Files Attached Files

  2. #2
    Super Moderator dave w's Avatar
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    Maybe you can modify the WBO2 .adx in this tread to work? http://www.gearhead-efi.com/Fuel-Inj...g)-Spreadsheet

    dave w

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    Quote Originally Posted by dave w View Post
    Maybe you can modify the WBO2 .adx in this tread to work? http://www.gearhead-efi.com/Fuel-Inj...g)-Spreadsheet

    dave w
    Thanks Dave, I will have a look and see. I think the main problem I'm having is the packet size that gets added onto the adx file for the extra channels of the apu1. I have my apu1 hooked up semi permanently so I can make changes very easily, but may have to just go through egr pintle wire as egr is disabled anyway. I still would like to figure out the extra channels though! I'll keep at it!
    Thanks! Dustin

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    Super Moderator dave w's Avatar
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    Hi Dustin,
    With definitions, $E6, $OD, $OE, & $31 the APU1 IS NOT needed for WBO2 data logging. The 0v - 5v output from the WBO2 is wired directly to the PCM. Wiring instructions included in the link I posted.

    dave w

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    LT1 specialist steveo's Avatar
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    it's not totally necessary, but i'd attempt to use the apu1 input, it's higher resolution than the 8 bit adc inputs of your ecm, also a lot of GM ecm analog inputs have pretty crappy linearity considering the impedance level of your average wideband output. make sure you set it to 16 b it and scale appropriately for its 0-1024=0.5v range and keep it in autoprom mode. i only did this with an apu1 once but i didn't have much trouble

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    Fuel Injected! woody80z28's Avatar
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    I'm not familiar with $E6, but on my $A1 I had issues and found out the "body size" was wrong. I emailed Moates to get it figured out and they were helpful.
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    Thanks fellas...I know I can go straight through pin b16, but I would really like to get this working through the autoprom. The wideband is 0.5v=8.5 afr, 4.5v=18 afr. Not exactly sure what to do with that? I think I have my conversion correct (x*0.00927734375)+8.5. On top of figuring the conversion out I need to figure out what the payload size is since it adds on top of the adx's current payload size. So far I think:
    Ch1 is 65&66
    Ch2 is 63&64
    Ch3 is 67&68.
    The channels on the apu1 are not in order. I am trying on ch2.
    I think I've been reading too much on this and confusing myself. Just wanna get it logging and start running it through Steve's Trimalyzer. It'll be really nice for adding other sensors too as well. Such as fuel pressure. Thanks guys
    Dustin

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    Fuel Injected! woody80z28's Avatar
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    That's the same as my AEM then...here's the math. I just figured it out finally last year.
    The analog AEM 0-5v is only accurate from 0.5-4.5v.
    http://aemelectronics.com/files/inst...line%20AFR.pdf
    So of the 1024, 0-102 and 921-1024 should be ignored when figuring the 9.5 AFR difference (8.5-18 sweep), 9.5 / 819 = .01159951.

    So for an AEM 30-5130 Analog Wideband the equation is (X * .0115991) + 7.3125.

    I checked it against the table in their PDF and it is good to go. Hopefully this can help someone in the future. Cause it definitely tripped me up.
    80 Camaro Z28 - 550hp AFR 383 / T56 6spd (Holley HP EFI)
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    That's some good info I would have never figured out. Gonna have to give it a shot tomorrow. Hopefully this along with the payload size will work. When it's not a correct reading, it's extremely hard to know what's causing it though.

    Quote Originally Posted by woody80z28 View Post
    That's the same as my AEM then...here's the math. I just figured it out finally last year.

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    Fuel Injected! donf's Avatar
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    Quote Originally Posted by woody80z28 View Post
    That's the same as my AEM then...here's the math. I just figured it out finally last year.
    That is a little different than what I came up with for the AEM 30-0310. The math is here explained by eaglemark. This was not the only change in the adx file to get it to work. I am running it direct to the ecm. No futzing required if you follow the instruction. X * 0.04638671875 + 7.3125

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    LT1 specialist steveo's Avatar
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    donf, we're talking about input to an APU1 which is 0-1024, your equation is probably for an 8 bit (255=5v) input.

    lets independently verify the math for what woody posted.

    AEM manual says: AFR = 2.375(V) + 7.3125

    APU1 datastream is 5v 0-1024.

    so 1024 is 5 volts and 0 is 0 volts, and 1024/5 = 204.8, then your APU1 is V=X/204.8

    so, AFR = 2.375(X/204.8) + 7.3125

    or if you like multiplication...

    AFR = 2.375(0.00488281 * X) + 7.3125
    = 0.0115967X + 7.3125

    i'd say that's the one i'd go with

    ... but the division looks cleaner and tunerpro doesn't mind division

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    Fuel Injected! donf's Avatar
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    Math is here http://www.gearhead-efi.com/Fuel-Inj...eband-Question
    Quote Originally Posted by EagleMark View Post
    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
    So... for my AEM 30-3010 we will follow the logic step by step from above.
    OK so from the above we need 0 and 5v numbers.

    Formula for the 30-0310 from the Install manual page 6
    0-5V Analog output
    AFR = (2.3750 * Volts) + 7.3125

    7.3125 = (2.3750 *0) + 7.3125
    19.1875 = (2.3750 *5) + 7.3125
    Conversions for 256 bit 0 to 5 volts!

    For the AEM 30-0310 Wideband 0v = 7.3125 AFR and 5V = 19.1875
    AFR of 7.3125 to 19.1875 is a difference of 11.875 divided by 256 = 0.04638671875

    Conversion for this would be:
    (X * 0.04638671875) + 7.3125
    Adding the offset makes 0 volts 7.3125 AFR

    This is for running direct to the ECM. Not the other.
    Last edited by donf; 05-18-2019 at 05:33 PM.

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    Thanks for breaking that down, helps me understand it much better now. I am going to be able to try it out later today after the boys soccer game. Do you guys know anything about the payload size, of how to figure it? My adx says payload size is 63, which would be 62 if starting from 0. In Mark's tutorial, it says it would be 63&64. So I should use 63 for that? I think it's 63 and 64 bc we have 2 bytes. Trial and error will work I suppose, just trying to understand it all. Thanks for all your help fellas
    Dustin

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    Fuel Injected! donf's Avatar
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    Quote Originally Posted by Stokes1114 View Post
    Thanks for breaking that down, helps me understand it much better now. I am going to be able to try it out later today after the boys soccer game. Do you guys know anything about the payload size, of how to figure it? My adx says payload size is 63, which would be 62 if starting from 0. In Mark's tutorial, it says it would be 63&64. So I should use 63 for that? I think it's 63 and 64 bc we have 2 bytes. Trial and error will work I suppose, just trying to understand it all. Thanks for all your help fellas
    Dustin
    If you are not running direct to the computer do not use mine. I put the math there then found the post above explaining the formulas are different running the interface you are running. I still do not understand the reasoning for trying to do anything other than just hook it direct as it works so well.

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    I was mainly doing it for ease of install. I have the autoprom mounted under my dash semi permanently so I can make changes quick, anytime I want. I don't have to repin anything, just add the 2 wires to it. But as Steve said the autoproms channels are 1024 bits so more resolution, and once I figure this out I can add any other sensors I want to log. It has 3 channels that show up in the same log. After I get this working I really want fuel pressure in as well. I think with the help I'm getting on here I should be able to get it going, but it's good to know I can always run it straight to pin b-16.

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