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Thread: spark cut rev limit

  1. #1
    Advanced Tuner
    Join Date
    Apr 2014
    Posts
    360

    spark cut rev limit

    id say this may have been asked before, if it has I apologise.
    is anyone aware of any way to do a spark cut rev limit with the barra pcms?

  2. #2
    Post the tune.

    I might be able to help.

  3. #3
    Advanced Tuner
    Join Date
    Apr 2014
    Posts
    360
    I don't have a specific tune lol, kinda asking as a generalised question for all barra pcm, but if I had to choose one, heres an fg xr6t.
    Attached Files Attached Files

  4. #4
    Tuner in Training
    Join Date
    Jun 2017
    Posts
    15
    you can get some soft cuts and hard cuts on the ignition circuit. N2MB WOT BOX is one of these, currently using one myself.
    just trying to find away around the PCM not liking loss of spark control

  5. #5
    Advanced Tuner
    Join Date
    Feb 2015
    Location
    Perth, Australia
    Posts
    974
    what happens if you set

    cutoff RPM 6100rpm

    RPM limit ETC 6650rpm

    then go to TM fuel tab and set rpm fuel cut to 0.0 to disable rpm fuel cut, then go to spark tab to rpm limit spark and set to 0.0 for the most aggressive spark cut?

    never tried it but in theory that is as good at factory ECU gets. only issue is that it will still keep building rpm with no timing if fuel is still active. youd have to use boost tables to rip out what you can after 6100

  6. #6
    I would try this:

    Just raise the RPM limit ETC to (something like 6550)