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Thread: Can a 6395 ECM run a MAF system?

  1. #1
    Carb and Points!
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    Can a 6395 ECM run a MAF system?

    I have a 1994 C2500 7.4L TBI and was given a 1999 7.4l Gen VI multiport induction system which is a mass airflow system and would like to know if the 1994 ECM (6395) has the capability to run a MAF system.
    Thanks to anyone who responds.

  2. #2
    Super Moderator dave w's Avatar
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    The 7.4 Vortec (1996 - 1999) can be converted to '6395 MPFI without MAF (Speed Density - the exact same way 1990 - 1992 TPI systems are). See attached .zip for additional information.

    Basically the MPFI conversion requires the injectors to be wired to "Bank Fire" which is the exact same way TPI injectors are wired.

    dave w
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    Last edited by dave w; 07-04-2020 at 08:19 PM.

  3. #3
    Carb and Points!
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    Thanks.
    Next question....Is it worth the effort?
    Will the system run efficiently on just a MAP input?

  4. #4
    Super Moderator dave w's Avatar
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    Quote Originally Posted by 94TBI View Post
    Thanks.
    Next question....Is it worth the effort?
    Will the system run efficiently on just a MAP input?
    There will be opinions about "Is it worth the effort" and "Will it run efficiently on just a MAP input".

    It's not a plug-n-play conversion, above average electronic and above average mechanical skills are an ABSOLUTE MUST!

    In my humble opinion, solely based on actual real world experiences, yes to both answers.

    Adding the electric fans, and tuning with a Wide Band Oxygen Sensor "double downs" on worth the effort and efficiency results.

    Tuning with Wide Band Oxygen Sensor information: http://www.gearhead-efi.com/Fuel-Inj...g)-Spreadsheet -- average Microsoft Excel skills required.

    dave w

  5. #5
    Carb and Points!
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    Quote Originally Posted by dave w View Post
    There will be opinions about "Is it worth the effort" and "Will it run efficiently on just a MAP input".

    It's not a plug-n-play conversion, above average electronic and above average mechanical skills are an ABSOLUTE MUST!

    In my humble opinion, solely based on actual real world experiences, yes to both answers.

    Adding the electric fans, and tuning with a Wide Band Oxygen Sensor "double downs" on worth the effort and efficiency results.

    Tuning with Wide Band Oxygen Sensor information: http://www.gearhead-efi.com/Fuel-Inj...g)-Spreadsheet -- average Microsoft Excel skills required.

    dave w

    OK thanks again.

  6. #6
    Carb and Points!
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    Dave W,
    Well I am ready to put my 7.4 back in the truck and have 2 options for the intake system. I have a performer manifold and adapter for the stock TBI which I can probably get running with the previous stock bin to gather data to tune. I also have a Vortec MPFI intake system such as the one you are running with the same 6395 computer. I prefer to use the MPFI but I also want to get the truck up and running quickly. As per this thread I am aware of the mods to the computer hardware etc. I was wondering if you could give me any advice or had a starter BIN for this set up to allow me to get it running and start tuning. I have a 4L80E. Thanks in advance.

  7. #7
    Carb and Points!
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    Also I have GM 24507495 injectors These are 34 lbs per hour and 1200ohm.

  8. #8
    Super Moderator dave w's Avatar
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    Maybe this .bin file will help?

    dave w
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