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Thread: Math Channel Sticky Thread

  1. #11
    Join Date
    Nov 2013
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    Not currently. I've asked for it several times now, LOL. Rate of change, or Derivative functions would be awesome.
    I actually made an Excel sheet that I export/import data into, and let it do the math calculation for me.
    -Scott
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    Project Blasphemy - 8.07 @ 171
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  2. #12

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    I have a rear wheel speed sensor setup that triggers off of the wheel studs. I'm trying to find a way to also use this to measure driveshaft RPM & converter slip. I have a 3.73 gear & 1.80 Powerglide. I'm just trying to wrap my mind around setting up a Math Channel to convert the 5 PPROT to engine RPM. Can anybody help me with this?

  3. #13
    Join Date
    Dec 2009
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    Connecticut
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    Quote Originally Posted by ButchB View Post
    I'm trying to find a way to also use this to measure driveshaft RPM & converter slip. I have a 3.73 gear & 1.80 Powerglide.
    First create a VSS Input (LINK) in the Inputs/Outputs ICF, using your 5 PPROT. Then use that variable for the Driveshaft RPM & Torque Converter Slip formulas (displayed in my Math Channels).

    I'm just trying to wrap my mind around setting up a Math Channel to convert the 5 PPROT to engine RPM.
    Engine RPM is already it's own displayed data channel.
    May God's grace bless you in the Lord Jesus Christ.

    '78 BRONCO: 508" stroker, TFS heads, 11:1 comp ratio, Dominator MPFI & DIS, cold air induction, Spal dual 12" fans/aluminum radiator, dual 3" exhaust/Magnaflow mufflers, Moroso vacuum pump, Accusump, engine oil & trans fluid coolers, 100HP progressive dry direct-port NOS, A/C, LenTech Strip Terminator wide-ratio AOD/2500 RPM converter, 3:1 Atlas II, modified Dana 44/60-lockers-4.10s, hydroboost/4-disc brakes, ram-assist/heim joint steering, Cage long radius arms, traction bars, 4" Skyjacker lift, 35" mud tires

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  4. #14

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    OK thanks. I see the notes explaining some of the numbers in your Math Channels, but a few I couldn't figure out. In the T/C Slip, what is the 336 for? And in the Driveshaft RPM, what is the 1056, and also the 3.14? Thanks.

  5. #15
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    Dec 2009
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    Connecticut
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    Quote Originally Posted by ButchB View Post
    OK thanks. I see the notes explaining some of the numbers in your Math Channels, but a few I couldn't figure out.
    Those are my specific engine/vehicle values, that's why I defined them.

    In the T/C Slip, what is the 336 for? And in the Driveshaft RPM, what is the 1056, and also the 3.14?
    Those numerical variables are just part of the math equation (for all applications). 3.1415 is Pi.
    May God's grace bless you in the Lord Jesus Christ.

    '78 BRONCO: 508" stroker, TFS heads, 11:1 comp ratio, Dominator MPFI & DIS, cold air induction, Spal dual 12" fans/aluminum radiator, dual 3" exhaust/Magnaflow mufflers, Moroso vacuum pump, Accusump, engine oil & trans fluid coolers, 100HP progressive dry direct-port NOS, A/C, LenTech Strip Terminator wide-ratio AOD/2500 RPM converter, 3:1 Atlas II, modified Dana 44/60-lockers-4.10s, hydroboost/4-disc brakes, ram-assist/heim joint steering, Cage long radius arms, traction bars, 4" Skyjacker lift, 35" mud tires

    New Holley Dominator ECU for sale: LINK.

  6. #16

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    Here's my channels:

    HP=[Fuel Flow]/.6

    Use a lower number for a N/A engine.

    Torque=[HP]*5252/[RPM]

    AFR delta=[AFR Left]-[Target AFR]

    Anything non zero means we aren't getting target AFR. I like to set the range at -2 and +2 on the datalog and make it a thick line.

    FP delta=[Fuel Pressure]-[Boost PSIG]-43

    Change 43 to whatever your base fuel is at. Anything non zero means we aren't getting the FP we expect. I set the range to -3 and +3 on the datalog. I do get a lag of about 150 msec when opening or closing the throttle abruptly.

    AE fuel=[Fuel Flow]-[Base Fuel lb/hr]-[CL Comp]*[Base Fuel lb/hr]/100-[Current Learn]*[Base Fuel lb/hr]/100-([Base Fuel lb/hr]-[Base Fuel lb/hr]*[Air Temp Enr]/100)

    Gives you your AE fuel flow only. Total fuel flow taking out base fuel, Closed Loop, learn, and Air Temp Enrichment.

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