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Thread: Deep 6.5 thoughts by Jack Handy

  1. #1
    Fuel Injected! brian617's Avatar
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    Deep 6.5 thoughts by Jack Handy

    95 C2500 6.5 turbo diesel 16212488 PCM

    This truck uses an APP sensor on pedal to feed the PCM with three different voltage ranges to calculate TPS% Angle.

    Now this is where it goes way over my head. How and where does the PCM use those voltages to to calculate TPS%?

    Hardware? Software?
    89 K1500 Scottsdale 5.7L 5spd 3:42 RamJet cam Dart iron TBI heads 427 PCM swap
    95 C2500 Cheyenne 6.5L turbo diesel 4L80e 4:10 DB2-4911 Manual pump conversion 0411 PCM trans control 2Bar COS
    05 Outback XT 2.5L turbo gas auto

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    Quote Originally Posted by brian617 View Post
    95 C2500 6.5 turbo diesel 16212488 PCM

    This truck uses an APP sensor on pedal to feed the PCM with three different voltage ranges to calculate TPS% Angle.

    Now this is where it goes way over my head. How and where does the PCM use those voltages to to calculate TPS%?

    Hardware? Software?
    The PCM hardware should read these as 3 separate 0-5 volt input signals and the software will use these values to calculate a TPS value.

  3. #3
    Fuel Injected! brian617's Avatar
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    Sounds reasonable, kind of what I had imagined. Is this a parameter that could be defined in the XDF? Or just written in code?
    89 K1500 Scottsdale 5.7L 5spd 3:42 RamJet cam Dart iron TBI heads 427 PCM swap
    95 C2500 Cheyenne 6.5L turbo diesel 4L80e 4:10 DB2-4911 Manual pump conversion 0411 PCM trans control 2Bar COS
    05 Outback XT 2.5L turbo gas auto

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    this is intreging a little,spent 2-4 hours laying on my belle changing pumps down in texas. wisdom in motion

  5. #5
    Fuel Injected! brian617's Avatar
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    That's it? No deep explaination, I know there are some great minds on here.
    89 K1500 Scottsdale 5.7L 5spd 3:42 RamJet cam Dart iron TBI heads 427 PCM swap
    95 C2500 Cheyenne 6.5L turbo diesel 4L80e 4:10 DB2-4911 Manual pump conversion 0411 PCM trans control 2Bar COS
    05 Outback XT 2.5L turbo gas auto

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    Fuel Injected! sturgillbd's Avatar
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    I flipped though the disassembly here: http://www.gearhead-efi.com/Fuel-Inj...4&d=1331397174 and found this section

    ;************************************************* ***********************
    ;* MODULE START: APP CONDITIONING
    ;************************************************* ***********************

    The DIS shows where it is reading values from the 3 potentiometers. Its going to take some stepping through the code to see where the final value is calculated. From what I glanced through, it has three pots. One increasing voltage with increasing throttle and two decreasing voltage with increasing throttle .

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    "If you live in New Mexico and you get invited to a costume party, don't go as a Mountain Lion; because you might end up getting trapped and skinned."

    peace
    Jack Handy

  8. #8
    Fuel Injected! brian617's Avatar
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    Quote Originally Posted by sturgillbd View Post
    From what I glanced through, it has three pots. One increasing voltage with increasing throttle and two decreasing voltage with increasing throttle .
    Thats what you see via live scanner data.

    Two things I'm interested in,

    1 Is this something that can be manipulated? Truck has been converted to manual injector pump and the leverage ratios between the manual pump and app don't align well.

    2 What other inputs could affect the way TPS% gets calculated. Very strange problem I have with gear ratio error being set by erratic spiking TPS% decelerating between 30-20 mph when tipping back into throttle, yet APP voltages do not correlate.
    89 K1500 Scottsdale 5.7L 5spd 3:42 RamJet cam Dart iron TBI heads 427 PCM swap
    95 C2500 Cheyenne 6.5L turbo diesel 4L80e 4:10 DB2-4911 Manual pump conversion 0411 PCM trans control 2Bar COS
    05 Outback XT 2.5L turbo gas auto

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    Quote Originally Posted by Hog View Post
    "If you live in New Mexico and you get invited to a costume party, don't go as a Mountain Lion; because you might end up getting trapped and skinned."

    peace
    Jack Handy
    Classic down right funny SNL stuff right there. Glad someone caught my jest.
    89 K1500 Scottsdale 5.7L 5spd 3:42 RamJet cam Dart iron TBI heads 427 PCM swap
    95 C2500 Cheyenne 6.5L turbo diesel 4L80e 4:10 DB2-4911 Manual pump conversion 0411 PCM trans control 2Bar COS
    05 Outback XT 2.5L turbo gas auto

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