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Thread: Help Fuel pressure

  1. #1
    Potential Tuner
    Join Date
    Oct 2014
    Posts
    3

    Question Help Fuel pressure

    Hi, I have a 2008 mustan GT 4.6 supercharged.
    I replace the complete fuel system with a aeromotive A1000 in thank fuel pump, aeromotive FPR and fuel rails, the pump is connected to IGN signal to active and FPR is set to 39-40 psi. The injectors are Siemens Deka #60lb.
    The fuel pressure sensor has removed but the new rails dont have the port to install.
    I calibrate the injectors with this data:


    Siemens (Continental) 60# Injectors
    (data below is for use in HPT format)

    Flow Rate Low: 63.1872

    Flow Rate High: 60.26760

    Breakpoint: 0.0000336300
    Note: You will need the latest beta of HPT in order to input this value, otherwise 2.22x will round up the data in this parameter, and you do NOT want this to happen!

    PW Minimum: 0.94985963
    Note: Ford Racing's data will have you use 1.391. HPT's 2.23 Beta is currently only allowing for a max of 1.0. I've a bug report to HPT to fix this. HOWEVER, many of us tuners have found that 0.94985963 works better for these injectors you're using anyway, and that is why I listed such above.

    Pressure Drop Ref: 39.15

    For the next 3 parameters, you're going to have to click the (psi) label and modify the values as I have listed below.

    Flow Rate High Mult vs. Pressure:

    PSI
    Code:
    20.010
    30.020
    39.150
    50.030
    54.960
    60.030
    Mult
    Code:
    0.71700
    0.87470
    1.00000
    1.13220
    1.18480
    1.23830
    Flow Rate Low Mult vs. Pressure:

    PSI
    Code:
    20.010
    30.020
    39.150
    50.030
    54.960
    60.030
    Mult
    Code:
    0.71490
    0.87560
    1.00000
    1.10410
    1.18480
    1.23830
    Offset Mult vs. Pressure:

    PSI
    Code:
    20.010
    30.020
    39.150
    44.950
    50.030
    54.960
    60.030
    Mult
    Code:
    0.71490
    0.87560
    1.00000
    1.07690
    1.07910
    1.18480
    1.23830
    This next parameter you will not need to modify the voltages. I just listed them for others who may need the information in the future.

    Offset vs. Voltage:

    Volts
    Code:
    6.000
    7.000
    8.000
    9.000
    10.000
    11.000
    12.000
    13.000
    13.500
    14.000
    14.500
    15.000
    PW Offset
    Code:
    0.0025900
    0.0020155
    0.0014410
    0.0011810
    0.0009210
    0.0007580
    0.0006360
    0.0005180
    0.0004635
    0.0004090
    0.0003605
    0.0003120

    The car start very lean (19-21 AFR) for one seconds and turn off.

    I try to change the flow rate high and flow rate low to 40-43 and the engine run fine with 14-15 afr.

    What is bad???

    I need to install the fuel pressure sensor or I can remove.

    Thanks for your help and sorry for my bad english.

  2. #2
    Its best to keep the rail pressure sensor so the pcm can control injector pulsewidth.

  3. #3
    post your tune so ppl can look it over. its easier to understand something when everyone can see the whole picture.
    GOD HELP US ALL....