POR-010, POR-011, POR012

Datalogging On POR-010, POR-011, POR012


Applicable Vehicles:

  • 991.2 / 718 vehicles


When And Why?:

When trying to diagnose driveability problems or assessing how well a new tune is working with the vehicle datalogging can be an invaluable tool.  By looking at what is going on with the vehicle under load or other conditions you're able to look at a picture in time and see if there were any issues or problems that would need to be addressed and sometimes where and why they occurred.  However a datalog is only as good as the monitors you record, much like how a map is only as useful as the information it has on it


How Should I Drive When I Datalog?:

Because most of the problems people have are those that show up under heavy load, we want to have some good boost characteristics over the datalog.  Therefore we recommend you find an empty stretch of road so that it's not only safe for other people, but safe for you.  When trying to diagnose a problem it's easy to have too much to look at, so when trying to diagnose something we recommend keeping it short and simple.  In these instances a datalog of a single run from 2500rpm to redline in 3rd gear (if running a 5-speed) or 4th gear (if you have a 6-speed) ensures you don't have to spend time sifting through extraneous data to find what you need.  If your problem has to do more with idle characteristics perform the 2500rpm run, but sometimes taking a look at what your car does at idle can be of some help.  Lastly if you're a road racer you may want to datalog for long streches of time which, when paired with track telemetry, can help you figure out when and where things were going well, and when things were going bad, this can help diagnose more intricate problems like fuel slosh or oil starvation.  However as datalogs get bigger sifting through the lenghty spreadsheets can get difficult and time consuming at that time you may want to invest in a datalog viewer program which converts your spreadsheets into simple graphs so you can go through a bunch of data all at once.


List of Available Monitors:

    • Accelerator Pedal Position (Actual)
      • Accelerator pedal opening angle percentage as determined by the accelerator position sensor.
    • Accelerator Pedal Position (Target) 
    • Ambient Air Pressure
      • Ambient air pressure (barometric pressure)
    • Ambient Air Temp
      • Ambient Air Temperature
    • Battery Voltage
      • Battery Voltage
    • Best Response Mode
      • Mode in which to spool the turbo for best response.
    • Boost 1 (Pre-Throttle)
      • Pressure measured in the intake post turbo and before the throttle (values spike at throttle closure)
    • Boost Filtered
      • Boost pressure with a filter value added in.
    • Boost Pre-Throttle (Limit)
      • Boost PUT limit
    • Boost Pre-Throttle (target)
      • Targeted pressure before the throttle
    • Brake Pressure
      • Line pressure applied to the brakes
    • Engine Speed
      • Engine Speed in revolutions Per Minute
    • Engine Load
      • The demand asked of the engine based on airflow and throttle position
    • Engine Oil Temp
      • Temperature of engine Oil
    • Engine Torque (Actual 2)
      • Actual Engine Torque 2
    • Engine Torque (Actual)
      • Actual Engine Torque 1
    • Engine Torque (Basic)
      • The base engine torque value
    • Engine Torque (Indicated)
      • TQI - A calculated level of torque
    • Engine Torque (Limitation 2)
      • The limit of how much torque will be allowed under certain conditions
    • Engine Torque (Limitation)
      • The limit of how much torque will be allowed under certain conditions
    • Engine Torque ((Mass Air Flow Calc)
      • This is the value of how much airflow is used for the mass air flow calculations
    • Engine Torque (Max Allowed)
      • Maximum allowed engine torque
    • Engine Torque (Max at Clutch)
      • Maximum allowed engine torque at the clutch
    • Exhaust Cam (Target)
      • Targeted position for exhaust cam
    • Exhaust Cam B1 (Actual)
      • Actual position for exhaust cam bank 1
    • Exhaust Cam B2 (Actual)
      • Actual position for exhaust cam bank 2
    • Exhaust Gas Temp (Pre Turbo)
      • Actual temperature of exhaust before the turbo
    • Fuel Cut (Authorize)
      • This is a flag to allow a fuel cut to happen
    • Fuel Cut (Enabled)
      • This is a flag that says a fuel cut is happening
    • Fuel Cut (Inhibit)
      • This will not allow the engine to cut fuel
    • Fuel Pressure (Actual)
      • Measured fuel pressure in the lines Actual value
    • Fuel Pump (Actual)
      • Fuel pump PWM duty cycle for low pressure pump Actual value
    • Gear
      • Transmission Gear Position
    • Ignition RON
      • An arbitrary value that increases as the learned knock increases, the higher the value the less timing the car will run based on a learned fuel quality.
    • Ignition Timing Correction Cyl1
      • Measure of negative knock correction for cylinder 1
    • Ignition Timing Correction Cyl2
      • Measure of negative knock correction for cylinder 2
    • Ignition Timing Correction Cyl3
      • Measure of negative knock correction for cylinder 3
    • Ignition Timing Correction Cyl4
      • Measure of negative knock correction for cylinder 4
    • Ignition Timing Correction Cyl5
      • Measure of negative knock correction for cylinder 5
    • Ignition Timing Correction Cyl6
      • Measure of negative knock correction for cylinder 6
    • Ignition Timing
      • Angle of rotation when spark is fired
    • Injection Time 1
      • Angle of rotation when injector is fired
    • Injection Time 2
      • Angle of rotation when injector is fired for double injection
    • Injection Time 3
      • Angle of rotation when injector is fired for triple injection
    • Intake Air Temp
      • Temperature of air going into the vehicle's intake
    • Intake Cam (Target)
      • Target angle for intake camshaft
    • Intake Cam B1 (Actual)
      • Actual angle for intake camshaft bank 1
    • Intake Cam B2 (Actual)
      • Actual angle for intake camshaft bank 2
    • Lambda Bank 1
      • Air Fuel Ratio of bank 1
    • Lambda Bank 2
      • Air Fuel Ratio of bank 2
    • Lambda pre CAT B2 (Target)
      • Air fuel ratio target taken before the cat on bank 2
    • lv_lamb_torque_ctl
      • Lambda (AFR_ cut is active to control torque
    • lv_tq_dyn_iga
      • Ignition timing is used to control torque
    • lv_tq_dyn_scc
      • Active sequential cylinder cut enabled to limit torque
    • lv_tq_lamb_ena
      • Lambda control to limit torque is enabled flag
    • lv_tq_lamb_inh
      • inhibit lambda intervention for torque control
    • MAF (Per Seg) (4 bytes)
      • Calculated MAF values 4 bytes long.
    • MAF Total
      • Combined total of all MAF variables added together.
    • MAF
      • Mass Air Flow measured in mg/stk
    • MAP (Target) (4 bytes)
      • MAP setpoint
    • MAP Filtered (4 bytes)
      • MAP reading filtered.
    • Map Measured
      • Measured MAP value from sensor.  This is a SENT sensor.
    • Predicted Air Mass
      • Calculated load value used to measure air mass.
    • Short Term Fuel Trim Bank 1
      • Short term fuel corrections applied to bank 1
    • Short Term Fuel Trim Bank 2
      • Short term fuel corrections applied to bank 2
    • Steering Angle
      • Position of the steering wheel
    • Throttle Angle (Actual)
      • Measured angle of the throttle blade
    • Throttle Angle (Target)
      • Target angle of the throttle blade
    • Torque Reduction Request
      • A request to limit torque production
    • tqi_req_fast_dtm
      • Indicated torque request fast
    • tqi_req_slow_dtm
      • Indicated torque request slow
    • Turbo Charger Rotational Speed (Target Max)
      • Maximum allowed turbo speed.
    • Turbo Charger Rotational Speed
      • Current turbocharger rotational speed (calculated not measured)
    • Turbo Protection State
      • State to prevent damage for turbo
    • Turbocharger Protection Activation
      • Flag to alert if turbo protection is active
    • Vehicle Speed
      • How fast the car is going
    • Waste Gate Actuation
      • Duty cycle of wastegate
    • Wheel Speed (FL)
      • Speed of the wheel Front Left
    • Wheel Speed (FR)
      • Speed of the wheel Front Right
    • Wheel Speed (RL)
      • Speed of the wheel Rear Left
    • Wheel Speed (RR)
      • Speed of the wheel Rear Right
    • Yaw
      • Angle of lean of the car in the vertical axis
    • B1 (Low FRAU B1)
      • Low speed long term fuel trim bank 1
    • B2 (Low FRAU B2)
      • Low speed long term fuel trim bank 2



Definitions:


  • AAT – Ambient Air Temperature
  • CCT – Catalytic Converter Temperature
  • ECT – Engine Coolant Temperature 
  • EOT – Engine Oil Temperature
  • EVT – Exhaust Valve Temperature
  • MBT – Minimum Timing for Best Torque
  • AFR – Air to Fuel Ratio (Lambda)
  • DC – Duty Cycle (used with various solenoids)
  • ECU – Engine Control Unit (also known as PCM)
  • MAP – Manifold Absolute Pressure (Post-Throttle)
  • OAR – Octane Adjust Ratio
  • FRP – Fuel Rail Pressure
  • LTT – Load To Torque
  • OTS – Off The Shelf
  • OB – Overboost
  • LSPI – Low Speed Pre-Ignition
  • HDFX – High Degree of Freedom Executive
  • CAT – Charge Air Temperature
  • COT – Compressor Outlet Temperature
  • EFT – Exhaust Flange Temperature
  • TOT – Transmission Oil Temperature
  • IAT – Intake Air Temperature
  • BL – Borderline (for ignition timing tables)
  • CL/OL – Closed Loop/Open Loop (for fueling tables) 
  • DTC – Diagnostic Trouble Code
  • O2 – Oxygen Sensor 
  • TIP – Throttle Inlet Pressure (Pre-Throttle) 
  • VCT – Variable Camshaft Timing
  • VSS – Vehicle Speed Signal (MPH/KPH)
  • TTL – Torque To Load
  • FBO – Full Bolt Ons
  • UB – Underboost
  • PD – Power Demand
  • VE – Volumetric Efficiency



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