Page 1 of 3 123 LastLast
Results 1 to 10 of 30

Thread: How to go MAFless

  1. #1
    Junior Member
    Join Date
    May 2006
    Posts
    15

    Default How to go MAFless

    Hi

    I currently have a 2002 Z06 with LS6 engine I use solely for the racetrack. The car has custom cam with .600 max lift and a Haltech Air intake with about 460hp at the wheels.

    I am considering running MAFless since the MAF sensor recently failed and we were unable to finish a race. My mechanic believes that is unnecessary for racing purposes and we can use MAP only instead.

    Although I don't consider myself and expert tuner, I feel confident modifying the tune as I have modified the Timing tables the PE and some of the idle tables as well as other tables over time.

    I've read some threads that address this issue and I am willing to give it a try but have the following questions:

    1. Do I need to convert to a custom operating system or Is it a setting I can just set to ignore the MAF sensor using my actual OS?
    2.If I go MAFless will this affect my actual timing and fuel mixture?
    3. Once done, what behavior should I expect from the car that would be considered normal? Idle issues etc.
    4. Can someone please provide a step by step of the process?

    I really appreciate any help with this issue.

    best regards,

    NoEsFacil

  2. #2
    Joe (Moderator) joecar's Avatar
    Join Date
    Apr 2003
    Posts
    28,403

    Default

    If you get a MAF DTC, then the PCM ignores MAF and runs from VE... BUT you must make certain that the MAF DTC triggers immediately (you may have to edit tables C6001 and C2901).


    If VE is correct then you will see no change (ignition timing is computed from cylinder airmass, which is computed from VE or MAF, whichever one is being used).


    If VE matches MAF (i.e. is correct) then you won't notice any other behavior.



    Read calibration from PCM and save to file.

    Locate table C6001: set P0101, P0102, P0102 to A:1-Trip.

    Locate tables C2901 and C2903: set both to 1.

    Save to file, then do cal-only flash.


    As usual with Corvette, before flashing, make sure other modules are not attempting to talk on the bus.



    When PCM ignores MAF and failsover to VE, one of the MAF DTC's should be present (and MIL illuminates).
    Last edited by joecar; September 12th, 2013 at 03:36 AM. Reason: FIX TYPO

  3. #3
    Lifetime Member
    Join Date
    Feb 2013
    Posts
    225

    Default

    What are tables C2091 and C2903: set both to 1 Joe?

    My OS doesn't have these.

  4. #4
    Lifetime Member ChipsByAl's Avatar
    Join Date
    Feb 2006
    Posts
    617

    Default

    Try C2901 and C2903. They are in the Engine Diagnostics/MAF/Parameters
    If you don't see them, post your file. There may be something compatible.
    Al
    "Trash that carb and get Injected!"

  5. #5
    Lifetime Member
    Join Date
    Feb 2013
    Posts
    225

    Default

    Nope don't have either of those

    thanks Al!

    Attachment 15815

  6. #6
    Lifetime Member ChipsByAl's Avatar
    Join Date
    Feb 2006
    Posts
    617

    Default

    Ok, looks like you have a 2006 not a 2002. Big differences but it appears as if you have the MAF fail mods done. The enclosed photo is from a 2002 OS.
    Al
    Click image for larger version. 

Name:	5230ca19.jpg 
Views:	329 
Size:	67.5 KB 
ID:	15816
    "Trash that carb and get Injected!"

  7. #7
    Lifetime Member limited cv8r's Avatar
    Join Date
    May 2005
    Posts
    567

    Default

    A read through these may help you out as well.
    Attached Files Attached Files
    It's all good until it goes "Bang"

  8. #8
    Lifetime Member
    Join Date
    Feb 2013
    Posts
    225

    Default

    Quote Originally Posted by ChipsByAl View Post
    Ok, looks like you have a 2006 not a 2002. Big differences but it appears as if you have the MAF fail mods done. The enclosed photo is from a 2002 OS.
    Al
    Click image for larger version. 

Name:	5230ca19.jpg 
Views:	329 
Size:	67.5 KB 
ID:	15816
    Thanks!

  9. #9
    Lifetime Member
    Join Date
    Aug 2010
    Posts
    1,934

    Default

    At a glance, that tune is from an early E38 and is configured for a 6.5L engine, large injectors, and a 2.5 Bar MAP ... fairly far from an LS6.

  10. #10
    Lifetime Member
    Join Date
    Feb 2013
    Posts
    225

    Default

    Quote Originally Posted by Taz View Post
    At a glance, that tune is from an early E38 and is configured for a 6.5L engine, large injectors, and a 2.5 Bar MAP ... fairly far from an LS6.
    Correct Taz, was just curious about the C2091 and C2903 Joe mentioned as I'd never seen them before
    (still have my L plates on for all this)

Page 1 of 3 123 LastLast

Similar Threads

  1. MAFless??????
    By Rvettej in forum Gen IV V8 Specific
    Replies: 14
    Last Post: June 24th, 2021, 11:20 PM
  2. mafless tune help
    By vcls1 in forum Tutorials
    Replies: 3
    Last Post: March 15th, 2012, 04:52 PM
  3. mafless patch
    By The Alchemist in forum E37, E38 & E67 PFI ECM's
    Replies: 3
    Last Post: November 19th, 2010, 07:01 PM
  4. Going MAFLESS and O2 less
    By The Alchemist in forum E37, E38 & E67 PFI ECM's
    Replies: 20
    Last Post: February 12th, 2008, 08:08 AM
  5. mafless/pcm
    By zrx1200 in forum General (Petrol, Gas, Ethanol)
    Replies: 2
    Last Post: January 25th, 2005, 12:48 PM

Posting Permissions

  • You may not post new threads
  • You may not post replies
  • You may not post attachments
  • You may not edit your posts
  •