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Thread: trying to tune my 2 step but my IAT spark advance table only goes down to +14 degrees

  1. #1
    Tuner in Training
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    trying to tune my 2 step but my IAT spark advance table only goes down to +14 degrees

    I wired a relay into my IAT sensor intending on going to my IAT spark advance table and commanding it to pull timing at that temperature that it reads when i hit the button. The IAT reads -19 when the power is cut to the sensor. When I went into my iat spark advance table to edit the tune, i noticed that it only goes down to +14 degrees fehrenheit. Also, rather than reading in cylinder airmass versus temperature, it reads MAP vs temperature. The problem I am facing there is that the MAP only goes to 100kpa in the iat spark advance table even though I am running a 3 bar OS with a 3 bar map sensor. How can I fix this? I thought I had a good understanding of how to navigate VCM editor but apparently I do not. I will attach the tune below.Turbo 4.8 Tune BTR NSR cam current.hpt
    Last edited by connerterry24; 10-20-2023 at 01:35 PM.

  2. #2
    Senior Tuner edcmat-l1's Avatar
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    Quote Originally Posted by connerterry24 View Post
    I wired a relay into my IAT sensor intending on going to my IAT spark advance table and commanding it to pull timing at that temperature that it reads when i hit the button. The IAT reads -19 when the power is cut to the sensor. When I went into my iat spark advance table to edit the tune, i noticed that it only goes down to +14 degrees fehrenheit. Also, rather than reading in cylinder airmass versus temperature, it reads MAP vs temperature. The problem I am facing there is that the MAP only goes to 100kpa in the iat spark advance table even though I am running a 3 bar OS with a 3 bar map sensor. How can I fix this? I thought I had a good understanding of how to navigate VCM editor but apparently I do not. I will attach the tune below.Turbo 4.8 Tune BTR NSR cam current.hpt
    Have you tried putting the timing you want to pull in the bottom left cell in that table? It should work. As long as the MAP is above 100 Kpa and the temp it "sees" is below 14* it should work. Just log your IAT timing and you'll see if it does or not.

    You can't edit the table axis so that's out. Set it up and try it. All you can do.

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