Page 2 of 2 FirstFirst 12
Results 21 to 30 of 30

Thread: How do I log AFR with MPVI2?

  1. #21
    Tuner
    Join Date
    Jul 2018
    Location
    Texas
    Posts
    53
    I was viewing a Calibrated Success video with a tuner friend. It discusses error correction set up for WB sensor. Setting up different tables (my terminology). I have the AEM 30-0334 WB and MPVI2. My current set up functions flawlessly. Have played around logging and making a few minor changes and writing. Run 93 octane. Installed 2 colder heat range plugs. Can I trust the WB readings or do I need to set it up to correct error? Do I need to wait for the Pro release to allow for additional inputs or can I successfully and accurately log and tune with what I have now? Just not wanting to damage engine due to lean condition or spark knock issues. Any videos, posts, or guidance would be appreciated. 2013 Chev Malibu 2.0L LTG Turbo with 6T70 FWD auto trans.. The info. here seems limited on the Malibu vs. Camaro/ATS/etc..
    Last edited by DGS; 09-01-2018 at 10:36 AM.

  2. #22
    Advanced Tuner
    Join Date
    Dec 2005
    Location
    Posts
    263
    If you are referring to ground offset errors, they do not apply to the 30-0334, while connected via the OBDII interface. That is a digital interface. so, you get digit-for-digit match between the logger and the gauge. If you are worried about sensor wear / calibration, there is a procedure for verifying the sensor that few know about. This only works with the 30-0300, 30-0333 and 30-0334.

    ( It works with the 30-0310 too, but, you need to know how to read the O2% CAN data, since there is no display )

    1. remove the sensor from the exhaust, as if you were going to do a free-air calibration.
    2. cover it with a box or something to shield it from wind/breeze.
    3. Set the gauge to display Oxygen % and 4-digits.
    4. Set the cal mode to r-cal ( not free air )
    5. You should get a number close to 20.5% ( not maxed out at 20.9% )

    This tells you how close the sensor is to its factory calibration state. The number should be lower than 20.9% because the factory calibrates the sensors at the equivalent of about +1psig to compensate for exhaust gas back pressure, when in actual use.

    The number may be slightly lower, due to altitude temperature, or low barometer reading. Or, a BIT higher, if you are right down at sea level, on a cold day. I have a table, somewhere...

    Obviously, if you do a free-air calibration, 1st, the gauge will always read right in free-air. So, you don't really learn anything about the health of the sensor. That's why you have to use the factory cal ( r-cal ) mode for this test.

    It is a good idea to do this whenever you have a new sensor, and, record the value. Then you have something to compare to later, under the same conditions.

    This should probably be documented, somewhere

  3. #23
    Tuner
    Join Date
    Jul 2018
    Location
    Texas
    Posts
    53
    Thanks for the reply. I did as you stated. 19.78 r-cal. I'm in Dallas, TX. 600 elevation. I previously installed Innovate Motorsports 3729 extended heat sink so as not to overheat the sensor and keep out of direct exhaust stream. To clarify (assuming I'm using the right terminology), I was referring to the logging of the vehicle after putting in open loop and if their is an error correction table/calculation needed when comparing the factory B1S1 02 reading and the wideband? That way the wideband would accurately read the result of the fuel delivered from the ecm that is utilizing the factory B1S1 02 input. Then one would know if they were getting accurate results? I assume the readings from both have to match to be accurate when changing fuel table cells richer or leaner to dial into 1.0 lambda? Or at least make it easier to hit the target?
    Last edited by DGS; 09-03-2018 at 02:11 AM.

  4. #24
    Tuner in Training
    Join Date
    Aug 2017
    Posts
    38
    I just purchased a AEM 30-0334 X Series wideband, set it all up and followed the instructions to get it to read, it is working and it is logging my Actual AFR, however there is no values in my AFR Error Histogram on the Graphs. I am really confused on how to make this AFR error work so i can tune my WOT the way i used to. I Have AFR Error (Math) as first parameter and MAF Frequency Sensor as Colomn Axis. With my old MPVI Pro I would use this histogram to log the AFR error and make the adjustments necessary...however with the OBD2 Style Can bus Wideband and my MPVI2 ....The AFR Error HIstogram is empty while in the channels list it is actually logging. Please help!

  5. #25
    Tuner in Training
    Join Date
    Aug 2018
    Posts
    24
    Do you have both Air-Fuel Ratio [Sensor] and Air-Fuel Ratio Commanded [Sensor] in your channels list?

  6. #26
    Advanced Tuner
    Join Date
    Dec 2005
    Location
    Posts
    263
    I did as you stated. 19.78 r-cal. I'm in Dallas, TX. 600 elevation.
    That's pretty good. I don't know what the temp & barometer reading was, that day, there. But, going by just straight pressure altitude @85F (guessing), 600ft would be 96.1% of sea level, density. So, 0.961 * 20.5 would give a reading of 19.70 Pretty damned close. Given that, your sensor appears to be in good shape. Any damage or significant wear would give a number much farther off of the ideal calculated value. IIRC, a new sensor is supposed to be about +/-2%

    I really should make a database of the readings at various altitudes, with new sensors, to make sure that the formula holds up. The 20.5 number is not written in stone, since I got it at a test elevation of about 100ft.

  7. #27
    Potential Tuner
    Join Date
    Sep 2018
    Posts
    4
    would the 30-0334 work for a standalone harness on a swap using a 09 g8 OS?

  8. #28
    Moderator
    Join Date
    Mar 2014
    Location
    Greensboro, NC
    Posts
    6,297
    If it is a CAN based vehicle, then yes, that will work. Anything 08+ should be CAN but confirm to be sure.
    Post a log and tune if you want help

    VCM Suite V3+ GETTING STARTED THREADS / HOW TO's

    Tuner by night
    CPX Tuning
    2005 Corvette, M6
    ECS 1500 Supercharger
    AlkyControl Meth, Monster LT1-S Twin, NT05R's
    ID1000's, 220/240, .598/.598, 118 from Cam Motion

    2007 Escalade, A6
    Stock

  9. #29
    Moderator mowton's Avatar
    Join Date
    Mar 2007
    Location
    Florida
    Posts
    3,779

    Tutorial on WB setup MPVI1 nd MPVI2

    A little light reading.......:-)

    Ed M
    Attached Files Attached Files
    2004 Vette Coupe, LS2, MN6, Vararam, ARH/CATs, Ti's, 4:10, Trickflow 215, 30# SVO, Vette Doctors Cam, Fast 90/90, DD McLeod, DTE Brace, Hurst shifter, Bilsteins etc. 480/430

    ERM Performance Tuning -- Interactive Learning ..from tuning software training to custom tunes
    HP Tuners Dealer- VCM Suite (free 2hr training session with purchase), credits and new Version 2.0 turtorial available
    http://www.ermperformancetuning.com
    http://www.facebook.com/ERMPerformanceTuning

    C5edstoy@aol.com

  10. #30
    HP Tuners Support
    (foff667)
    Bill@HPTuners's Avatar
    Join Date
    Jun 2004
    Location
    Hailing from Parts Unknown
    Posts
    25,538
    we'll be offering an analog pigtail in the coming weeks as well if you can hold out
    It doesn't have to be perfect, it just needs to be done in two weeks...

    A wise man once said "google it"