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Thread: How to set up EIO when you have a voltage offset

  1. #61
    Senior Tuner S2H's Avatar
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    Quote Originally Posted by mgm1979
    thanks again for all the help...lookin' forward to getting some logs tomorrow and FINALLY getting this thing tuned right.
    I helped him over the phone tonight
    I had him reset his LM1 to a more reasonable AFR range and Voltage setup
    10-18 AFR
    0-5 volts

    which yields a [volts/0.625 + 10] formula

    then I had him set his outputs to both be 2.95 volts
    meaning
    10AFR=2.95v
    18AFR=2.95v

    this gives us a flatline output to go by in our scanner so that we can match it to 14.7

    In the scanner we use outr formula and push around the AFR portion of it till it matched 14.7
    his was off by .17AFR higher so we moved our formula to be [volts/0.625 + 9.83]
    double checked it and moved it to be [volts/0.625 + 9.85]

    then set back the LC1 to
    10=0v
    18=5v

    and he's set

    your offset voltage doesnt change your formula for voltage/range
    it changes the AFR minimum value

    we told the output what 14.7 was in our 10-18 setup

    the scanner is set up so that we can get an average over a few seconds so we can see what our output voltage is showing at the EIO translated in AFR...so that we can set up our offset properly.


    located below are the pics of what I had him do

    you shouldnt worry about the extreme ends being correct...it doesnt scrunch your volatages...internally it still uses the formula you program..
    but when you get to the ends it truncates the voltages to be its physical limits..
    they might call it a 0-5 volt device but its usually not truely capable of 0 volts or 5 volts...but the steps in the middle do follow your set voltage formula
    Last edited by S2H; 03-20-2007 at 09:30 PM.
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  2. #62
    Tuner Street Legal's Avatar
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    do you need to repgorame the LM1 with its programmer before hookin it up to the HPT ?

  3. #63
    Senior Tuner S2H's Avatar
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    yes..
    set it to regular voltages to find the 14.7 crossing point..no HPT needed till the next step
    and then you set it to the 14.7 cross voltage..hook it to HPT...
    then once you are all set you set it back to regular voltages again before you reconnect to HPT and start with your logging
    Last edited by S2H; 03-20-2007 at 09:37 PM.
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  4. #64
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    if you see anything other than 14.7 then you need to adjust your formula slightly
    as an example
    if you saw an average of 14.5 then you woule need to shift your minimum AFR by 0.2
    so the new formula would be
    volts/0.625 + 10.2
    if you saw 14.9 then it would be the other direction
    volts/0.625 + 9.8
    we never change our actual steps calculation (0.625 figured from 5volts range/8AFR range)


    How do I shift my minimum AFR by .2 ?
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  5. #65
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    After following the directions I get a steady 16.06 AFR.

    volts/0.625 + 8.64

    Where do I plug the formula in??
    03 LS-1 Vette, LGM Longtubes, BillyBoat Bullets, Halltech Stinger, Shaner ported & polished TB, LC-1 WB, Elite E2 Plate, BPP Shifter, DTE 4:10

  6. #66
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    User Defined Enhanced IO Inputs ??
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  7. #67
    I have the same problem... You cant change the EIO for the LM1.

    Where is the formula?! You lost me after you find the offset amount. Im always in the 1.5-2.0 range, but you say you just adjust the minimum AFR range by this amount but you also say that you set the minimum back to 10.0 @ 0 volts... what are you changing by the offset?

  8. #68
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    In the scanner open the table display. Right click on the EIO 1 (if that's where you wired w/b the output to). Left click "insert". Expand "user defined". Double click "configure user defined".
    Install formula. Name it, set sensor to O2, set units to afr.
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  9. #69
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    Quote Originally Posted by cjs27410
    After following the directions I get a steady 16.06 AFR.

    volts/0.625 + 8.64

    Where do I plug the formula in??

    This over corrected by 2x in the other direction.

    volts/0.625 + 9.75

    seems to be very close.
    03 LS-1 Vette, LGM Longtubes, BillyBoat Bullets, Halltech Stinger, Shaner ported & polished TB, LC-1 WB, Elite E2 Plate, BPP Shifter, DTE 4:10

  10. #70
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    volts/.625 + 10

    HPT & LC-1 - matched the afr #'s

    Plugging the LC-1 O2 default back in and the HPT readout jumped 1.2 AFR points over the LC-1 readout.
    Last edited by cjs27410; 03-28-2007 at 11:28 AM.
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  11. #71
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    Has one tried this with a NGK Powerdex wideband yet? I'm going to have to try it to see sometime.

  12. #72
    I did a second user defined input and labeled it corrected AFR% error. that worked out fine. it seemed to be out at the same amount across the board so I just configured it to be (([sens121] - 0.2)-[sens120])/[sens120]. this work out very well with favourable results. I have a autometer wb so I had to program a user defined parameter for that first. it seemed to be the easiest way work with it.
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  13. #73
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    Configuring LM-2

    ok, so just picked up an LM-2 - determined it's min voltage output to be .7 and it's max at 4.9...for the sake of ease, I'll program my voltage range to be .9 = 10AFR and 4.9 = 18 AFR.

    If I remember right, that would make my formula volts/.5 + 10, correct?

    With that range, I've determined 14.75 AFR = 3.3 volts, but when setting the min/max outputs to 3.3 and scanning, it actually yields about 3.4v (so I have a .1 volt offset?)

    What's my next step?
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