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Thread: Ford Speed Density Calculator

  1. #61
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    You can right click and select undo. The calculator will not let you go leaner, than what it was stock, it defaults to around 100% VE. You will need to manually regress coefficients to go leaner. If the vehicle is running leaner than stock, then you probably have mechanical issues. The following is how you watch VE.

    Once you are in boost, VE will go linear (blow through) and it needs to stay linear. Especially in the higher RPMs. The SD is basically assuming as much airmass as is physically possible to be going into the cylinder and matching it with fuel mass.

    From a 18 F150 2.7l V6 file
    Make sure you use inHg, it is the unit calculated from airmass in the ECU, and if you want to do your own regression it needs to be used.
    Make sure this is inHg.PNG

    Units in inHg.PNG

    I removed the 500RPm column because of the negative loads

    nothing over 100 out of boost, flat VE in boost.PNG

    3d chart of VE

    ve 3d.PNG


    Now if you wanted to just tell the SD to give it more fuel, forget physics, you need to keep it linear from once it is in boost.
    Select the area in boost, and multiply by 1.1 to keep it linear. If I use .9 in this, a bunch of it gets set to 100% VE like a torque curve 4000+.

    +10% fuel.PNG

    VE after.PNG

    VE after adding 10%

    +10% fuel after.PNG

    VE after removing 10%

    Lowering loads.PNG
    Last edited by murfie; 10-04-2021 at 01:44 AM.

  2. #62
    Senior Tuner metroplex's Avatar
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    Murfie, are you logging stft, ltft or stft+ltft to make the SD adjustments?

  3. #63
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    This is a very good explaination of Speed Density, and makes it easy to tune a Speed Density-only car.

    Unfortunatelly I get confused whith Coyote which is MAF only

    Can someone guide me regarding this part?:

    For example, if we're on a MAF Equipped Coyote, and we hit steady state, we may notice the load in our table is off from what we actually have measured via our installed MAP sensor and actual load
    I understand the idea, but the question is:
    - where the external MAP sensor should be installed in the car to measure the MAP?
    - I should install the external MAP to the VCM scanner. I read the pressure values and populate the histogram, but I need to do some math to calculate the actual load from the pressure, so I can compare it with the values in the Speed Density calculator table.

    What math should I do to calculate the actual load from the MAP sensor? and then calculate the difference between actual load and the load in Speed Density table?

    edit:
    ... or maybe I should log a histogram with:
    y = external map sensor
    x = RPM
    z = engine load

    and just compare it with the speed density calculator table?
    Last edited by lambda1; 12-20-2021 at 03:01 AM.

  4. #64
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    Ford 5.0 Coyote Speed Density Calculator Error

    [QUOTE=Steven@HPTuners;504979]Available in the latest VCM Suite beta is a new calculator for the Ford Speed Density model. This calculator is quite sophisticated, so an understanding of the process is vital to help get the best results from the calculator. The calculator is capable of giving you the quadratic coefficients including blowthrough, with the goal being to hasten/simplify the process of calibrating this model.

    --------------------------------------------------------------------------------------------------------------------------------------------------------------

    on a 2015 5.0 Coyote F-150 if I go to mapped point - "Optimum Power" under the speed density calculator and add 20% or "1.2" and select any part of the map and hit the Calculate Coefficients button it will change the engine speed up top to 0.0000010

    It also has an effect on Air Charge Multi, Maximum Load, Offset, Quadratic Term, Slope, and Blowthrough slope on .... Engine->Airflow->Speed Density Tab

    Make sure you have a backup to compare so you can copy the data back to the way it was. It will corrupt your tune and possibly write bad data to the ECU

    Clipboard01.jpg
    Last edited by Coldfusion; 05-31-2023 at 01:55 PM. Reason: Added Note

  5. #65
    HPT Employee Eric@HPTuners's Avatar
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    [QUOTE=Coldfusion;731987]
    Quote Originally Posted by Steven@HPTuners View Post
    Available in the latest VCM Suite beta is a new calculator for the Ford Speed Density model. This calculator is quite sophisticated, so an understanding of the process is vital to help get the best results from the calculator. The calculator is capable of giving you the quadratic coefficients including blowthrough, with the goal being to hasten/simplify the process of calibrating this model.

    --------------------------------------------------------------------------------------------------------------------------------------------------------------

    on a 2015 5.0 Coyote F-150 if I go to mapped point - "Optimum Power" under the speed density calculator and add 20% or "1.2" and select any part of the map and hit the Calculate Coefficients button it will change the engine speed up top to 0.0000010

    It also has an effect on Air Charge Multi, Maximum Load, Offset, Quadratic Term, Slope, and Blowthrough slope on .... Engine->Airflow->Speed Density Tab

    Make sure you have a backup to compare so you can copy the data back to the way it was. It will corrupt your tune and possibly write bad data to the ECU

    Clipboard01.jpg
    Can you email me this file?
    Eric Brooks
    HP Tuners, LLC

  6. #66
    Tuner in Training Rspec's Avatar
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    [QUOTE=Coldfusion;731987]
    Quote Originally Posted by Steven@HPTuners View Post
    Available in the latest VCM Suite beta is a new calculator for the Ford Speed Density model. This calculator is quite sophisticated, so an understanding of the process is vital to help get the best results from the calculator. The calculator is capable of giving you the quadratic coefficients including blowthrough, with the goal being to hasten/simplify the process of calibrating this model.

    --------------------------------------------------------------------------------------------------------------------------------------------------------------

    on a 2015 5.0 Coyote F-150 if I go to mapped point - "Optimum Power" under the speed density calculator and add 20% or "1.2" and select any part of the map and hit the Calculate Coefficients button it will change the engine speed up top to 0.0000010

    It also has an effect on Air Charge Multi, Maximum Load, Offset, Quadratic Term, Slope, and Blowthrough slope on .... Engine->Airflow->Speed Density Tab

    Make sure you have a backup to compare so you can copy the data back to the way it was. It will corrupt your tune and possibly write bad data to the ECU

    Clipboard01.jpg
    Im running into this same issue! Ughhh
    Why does the EPA have to make life so hard?

  7. #67
    HPT Employee Eric@HPTuners's Avatar
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    Email your tune to eric@hpt*****.c**
    Eric Brooks
    HP Tuners, LLC

  8. #68
    Tuner in Training Rspec's Avatar
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    Quote Originally Posted by Eric@HPTuners View Post
    Email your tune to eric@hpt*****.c**
    Done!
    Why does the EPA have to make life so hard?

  9. #69
    Tuner in Training
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    when using the speed density calculator how does one figure out which exh map i would need to make changes for a 2021 GT500 is there a pid or a inferred table i should be looking at

  10. #70
    Any help regarding this ? I understand we can't squeeze more out of the calculator than the "physics" allow but my trims are in the +30%. I don't want to mess up the injector data because I'm running on oem injectors and don't believe I should adjust them.

    True speed density application not a MAF based coyote engine.

  11. #71
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    How do you lock the map points?
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