POR-006

Datalogging On POR-006

 

Applicable Vehicles:

  • 911 (991) Turbo S 2014-2016
  • 911 (991) Turbo PDK

 

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.

 

 

Useful Monitors In Every Situation:

  • Ambient Air Pressure
    • Ambient Air Pressure from ECU used to adjust for environmental conditions.
  • Boost (Map Actual)
    • Manifold Absolute Pressure Actual Value
  • Boost (Map Target)
    • Manifold Absolute Pressure Target Value
  • Boost 1( Pre Throttle)
    • Boost pressure up throttle actual value
  • Boost 2(Pre Throttle)
    • Boost pressure up throttle target value
  • Engine Load
    • Engine load value from 0-100%
  • Engine Speed
    • This is the engine speed in RPM
  • Engine Temp
    • Engine Coolant Temperature value
  • Engine Temp (Actual)
    • Actual engine coolant temperature value
  • Engine Torque (Actual)
    • Calculated actual engine torque
  • Engine Torque (Target)
    • Target torque value that the ECU is trying to get to
  • Fuel Pressure (Actual)
    • Actual High Pressure Fuel Pressure value
  • Fuel Pressure (Target)
    • Target High Pressure Fuel Pressure value.
  • Gear
    • Transmission Gear Position
  • Ignition Timing
    • Ignition angle (BTDC)
  • Ignition Timing Correction Cylinder 1
    • Negative knock correction for cylinder 1
  • Ignition Timing Correction Cylinder 2
    • Negative knock correction for cylinder 2
  • Ignition Timing Correction Cylinder 3
    • Negative knock correction for cylinder 3
  • Ignition Timing Correction Cylinder 4
    • Negative knock correction for cylinder 4
  • Ignition Timing Correction Cylinder 5
    • Negative knock correction for cylinder 5
  • Ignition Timing Correction Cylinder 6
    • Negative knock correction for cylinder 6
  • Intake Air Temperature
    • Intake air temperature read through the TMAP sensor.
  • Intake Cam (Target)
    • This is the intake camshaft target angle value
  • Intake Cam 1 (Actual)
    • Actual intake camshaft target angle value Bank 1
  • Intake Cam 2 (Actual)
    • Actual intake camshaft target angle value Bank 2
  • Lambda Bank 1
    • Lambda Reading for Bank 1
  • Lambda Bank 2
    • Lambda Reading for Bank 2
  • MAF
    • Calculated MAF value
  • Oil Pressure (Actual)
    • Actual oil pressure in the engine
  • Throttle Angle (Actual)
    • Actual throttle angle
  • Throttle Angle (Target)
    • Target throttle angle
  • Turbo Protection
    • Value that will signal if the ECU is using any of the turbo protection tables.
  • VTG Bank 1 (Actual)
    • VTG duty cycle actual value for Bank 1
  • VTG Bank 1 (Target)
    • VTG duty cycle target value for Bank 1
  • VTG Bank 2 (Actual)
    • VTG duty cycle actual value for Bank 2
  • VTG Bank 2 (Target)
    • VTG duty cycle actual value for Bank 2-
  • Vehicle Speed
    • Vehicle Speed

 

List of Available Monitors:

  • Diverter Valve
    • 0 or 1 meaning active (1) or not active (0).
  • Engine Oil Temperature
    • Measure engine oil temperature
  • Engine Torque (Delta)
    • Delta ratio between the actual engine speed and target.
  • Exhaust Gas Temp (Pre Turbo)
    • EGT value that is modeled, pre turbo.
  • Exhaust Gas Temp 1
    • This is the reading of the EGT sensor Bank 1
  • Exhaust Gas Temp 2
    • This is the reading of the EGT sensor Bank 2
  • Fuel Pump (Actual)
    • PWM duty cycle of the low pressure pump, actual value
  • Fuel Pump (Target)
    • PWM duty cycle of the low pressure pump, Target value
  • Fuel Pump Switch
    • Switch to determine when the pumps are turned on.
  • Large Lift Request
    • 0 or 1 switch if the ECU is requesting large valve lift. Generally will request it under WOT
  • MAF (Per Seg)
    • Calculated MAF value per segment
  • MAP (Target)
    • This is the MAP target setpoint used in the PUT Setpoint table. It is the Y axis.
  • Oil Pressure (Target)
    • Target oil pressure in the engine
  • Pedal Position
    • APP or accelerator pedal position
  • Predicted Air Mass
    • This is another calculated MAF value with a higher reading about 1389.
  • Predicted Torque at Clutch
    • This is a torque value that is used in factoring in some of the PDK torque safety values.
  • Trans Oil Temp
    • PDK Transmission fluid temperature

 

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