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Thread: MPI: MAF-2-MAP conversion

  1. #1
    Registered Member igdrasil's Avatar

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    MPI: MAF-2-MAP conversion

    All updates will be ALSO posted in this 1st post

    This week I will be starting the MAF to MAP conversion. This means Im going to replace the MAF for a 2.5BAR MAP sensor. I know this involves a lot of tunning, first starting with logging voltages on both the MAF and the MAP.

    Im still on the brainstorming, trying to find the best way to log both sensors output at the same time, then work on the analog map to do the necesary corrections so the MPI output thru the MAP matches the stock MAF output.

    Any ideas, suggestions, comments are welcomed. good or bad, pros and cons, doesnt matter..all of em help.


    UPDATE JAN. 30, 2005 -CAR IS RUNNING WITH NO MAF!!!
    Idle is perfect, acceleration thru all the rpm band is great. Normal Driving is fantastic considering there is no tunning at all, only some numbers on the analog map. Some stumbling building boost, but the rest is smooth. And finally...no stalling issue so far, still need to vent the BOV more and see if its stalls or not



    Last edited by igdrasil; 01-30-2005 at 11:42 PM.

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    P1kaChu Haz P4rts 4 yU0 Captain KRM P5's Avatar
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    i think kooldino would be the person to ask on this subject, no? i only say this as i know he has done the change on his mpi

  3. #3
    Registered Member igdrasil's Avatar

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    Quote Originally Posted by Captain KRM P5
    i think kooldino would be the person to ask on this subject, no? i only say this as i know he has done the change on his mpi
    I dont know for sure...but I think he still have the MAF controlling stock injectors and MAP sensor for boost reference to control extra injector and ignition control.
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    Unemployed Jerk StuttersC's Avatar

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    Why are you switching?
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  5. #5
    Registered Member igdrasil's Avatar

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    Quote Originally Posted by StuttersC
    Why are you switching?
    Couple of reasons.

    1. Tunning ability for up to 21psi on the 2.5BAR MAP
    2. Remove MAF restriction.
    3. BOV Stalling issue will be gone.
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  6. #6
    101010 = 42 Micah's Avatar


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    that seems like a lot of work for decent results.

    Good luck. I think for most people it would be more economical to upgrade to the 80mm MAF. BOV's, on the one hand I think they are rice, but on the other - they do serve a purpose, I just hate the "ricer hard-on"'s that people get when they hear it vent to atmosphere. Admittedly, I myself (shame) admit it's pretty kewl sounding.

    Then again - up to 21psi...... good golly miss molly. I can't wait to see how things progress.
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    Registered Member Fast lane's Avatar

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    I think you should just run the 80mm MAF(its massive) and screw the atmoshphere bov and just recirculate...

  8. #8
    Transmission Destroyer Focus's Avatar

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    Quote Originally Posted by igdrasil
    This week I will be starting the MAF to MAP conversion. This means Im going to replace the MAF for a 2.5BAR MAP sensor. I know this involves a lot of tunning, first starting with logging voltages on both the MAF and the MAP.

    Im still on the brainstorming, trying to find the best way to log both sensors output at the same time, then work on the analog map to do the necesary corrections so the MPI output thru the MAP matches the stock MAF output.

    Any ideas, suggestions, comments are welcomed. good or bad, pros and cons, doesnt matter..all of em help.
    You can use something like the Innovate LM-1 with the AUX cable and log up to 6 inputs at the same time, up to 44 mins.
    Last edited by Focus; 01-30-2005 at 10:26 AM.

  9. #9
    Registered Member igdrasil's Avatar

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    Update Jan. 30, 2005

    CAR IS RUNNING WITH NO MAF!!! (placed on my backseat)

    Idle is perfect, acceleration without load thru all the rpm band is great. I would love to take a video but my cam is dead.
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  10. #10
    Transmission Destroyer Focus's Avatar

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    Quote Originally Posted by igdrasil
    CAR IS RUNNING WITH NO MAF!!! (placed on my backseat)

    Idle is perfect, acceleration without load thru all the rpm band is great. I would love to take a video but my cam is dead.
    A How-To would be nice to read.
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  11. #11
    yes, yes i do. dominoy2k1's Avatar
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    Quote Originally Posted by Focus
    A How-To would be nice to read.
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  12. #12
    Registered Member igdrasil's Avatar

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    Update...this is anyway a PM i sent to focus:

    Its very very very easy to at least start the car and make it idle.

    The fun starts as you go into 0 vac.

    I found the best way to do this (if you can handle issues) is to 1st start the car with the MAP and make it idle having the MAF only connected to the EngTemp wire and monitor BOTH the Analog Output and EngTemp voltage.

    Normally when the car Idles the MAF is sending about 1.9v-2.2v, the map will send about .30v-.80v so you just have to rise the fuel zero calibration to XX number, until itl sends around 2.0v-2.4v out of the map voltage on idle.

    Now having the car idle fine, the fun part starts. Now we separate men from children. Its not easy, but its fun and a challenge.

    The easiest way is to monitor both voltages on the graph and try to keep both drawings nearly equal, to mimic each other. I will post a pic in a few minutes and a log file.
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  13. #13
    Registered Member igdrasil's Avatar

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    This is how it looks

    Check this...you will see the voltages differences, this is how it will start, you need to get both lines nearly identical, check voltages at the left corner, this is what you most likely want to see all the time (refering to voltage, notice the green bar) unless you want to do corrections when you want to behave different. If you want near stock feel, both lines should mimic one other:



    More of the same, you need to correct these peaks, differences:



    Getting better:



    And better....
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  14. #14
    I Too Be Wit The Darkside KzA's Avatar

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    WOW...that sensor readout is nothing short of SICK...Good work man damn...Im Impressed

    It would really be appreciated if you wrote something up on this..like a REAL good writeup going into the tuning alterations that have to be made..Then we could put it in the MPI Library Sticky so all of us could use it...

    Please?
    -Joe
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  15. #15
    MOTM Winner Jan '09 Kooldino's Avatar
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    Quote Originally Posted by igdrasil
    I dont know for sure...but I think he still have the MAF controlling stock injectors and MAP sensor for boost reference to control extra injector and ignition control.
    Yeah, that's how I'm set up. Why are you switching to all MAP? I thought you were happy with the MAF setup?
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