Results 1 to 2 of 2

Thread: PID Selection

  1. #1
    Junior Member
    Join Date
    Jul 2007

    Red face PID Selection

    Hi there, I noticed that if trending is turned on for certain PID's, the values of others can change quite a bit. I first ran into this when I tried turning on the injector pulse width PID's and saw timing and knock return change drastically.

    Does anyone know of any rules of thumb when choosing which loops to trend and how many is too many?

    Thanks in advance for your help!

    - bret

  2. #2
    Junior Member
    Join Date
    Jul 2007


    Hi folks. In the absence of feedback, I did find this in an adjacent thread:

    Quote Originally Posted by ds8
    These are the ones I am using:

    Y Calculated Injector Flow Rate (Generic scan mode only) INJFLOW Grams/s,Lbs/Min Fuel 2 GM.INJFLOW
    Y Calculated Load Value LOAD_PCT % Performance 1 SAE.LOAD_PCT
    Y Cam Phase Angle Desired CAMPA_DES Degrees Conditions 2 GM.CAMPA_DES
    Y Commanded Air Fuel Ratio B AFR_B :1 Fuel 1 GM.AFR_B
    Y Delivered Engine Torque to Transmission TRQENG_B Nm,Ft-Lbs Transmission 2 GM.TRQENG_B
    Y Engine Coolant Temperature ECT °C,°F Temperature 1 SAE.ECT
    Y Engine RPM RPM RPM Conditions 2 SAE.RPM
    Y Ignition Timing Advance for #1 Cylinder SPARKADV Degrees Spark 1 SAE.SPARKADV
    Y Injector Pulse Width Injector 1 INJ1PW ms Fuel 2 GM.INJ1PW
    Y Intake Air Temperature IAT °C,°F Temperature 1 SAE.IAT
    Y Intake Manifold Absolute Pressure MAP kPa,inHg Air 1 SAE.MAP
    Y Last Shift Time SHIFTLAST Seconds Transmission 1 GM.SHIFTLAST
    Y Long Term Fuel Trim - Bank 1 LONGFT1 % Fuel 1 SAE.LONGFT1
    Y Retard Due to Knock KR Degrees Spark 1 GM.KR
    Y Short Term Fuel Trim - Bank 1 SHRTFT1 % Fuel 1 SAE.SHRTFT1
    Y Throttle Position TP % Throttle 1 GM.TP
    Y Transmission Fluid Temperature TFT °C,°F Temperature 1 GM.TFT
    Y Vehicle Speed Sensor VSS KMH,MPH Conditions 1 SAE.VSS
    Here is the link to that thread:

Similar Threads

  1. E38 Pid selection
    By johnsZ06 in forum Gen IV V8 Specific
    Replies: 50
    Last Post: July 21st, 2008, 06:35 AM
  2. lm-1 pid selection wants lc-1
    By louis in forum General (Petrol, Gas, Ethanol)
    Replies: 2
    Last Post: June 10th, 2008, 12:11 PM
  3. PID selection???
    By 10secvette in forum Gen IV V8 Specific
    Replies: 1
    Last Post: January 6th, 2008, 04:29 PM
  4. pid selection
    By Dale in forum Vortec V6/V8 Specific
    Replies: 0
    Last Post: November 21st, 2007, 02:55 PM

Posting Permissions

  • You may not post new threads
  • You may not post replies
  • You may not post attachments
  • You may not edit your posts