Datalogging On POR-001 & 004

Applicable Vehicles:

POR-001

• 911 (997.1) Turbo AT/MT 2007-2009
• 911 (997.1) GT2 MT 2008-2009
• 911(997.1) GT2 RS MT 2011 (997.2 vehicle however uses 997.1 engine management system)

POR-004

• 911 (996) Turbo AT/MT 2001-2005
• 911 (996) Turbo X50 AT/MT 2002-2005
• 911 (996) GT2 MT 2001-2005

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 intosimple graphs so you can go through a bunch of data all at once.

Useful Monitors In Every Situation:

• Ambient Pressure
  
  • Barometric pressure reading, allows a tuner to see the atmospheric pressure where you drive your car and makes it easier to compensate for altitude.
• Boost Error
  
  • The difference between the amount of boost requested by the computer, and what the vehicle actually has.
• Engine Oil Temperature
  • Temperature of the engine oil helps with checking health of the engine, how hard it's being pushed, and whether the oil would need a cooler or to be changed.
• Engine RPM
  • Engine speed in RPM (revolutions per minute) Provides a refereance of what the engine is doing so that all the other values make sense.
• Engine Temperature
  • Temperature of the engine allows us to see if the vehicle is having problems related to overheating, or being pushed too hard.
• Ignition Angle (Actual)
  • Final ignition timing value after all corrections.
    
• Injection Time 
  • Injector open time in milliseconds.
    
• Intake
  • Air Temperature-Intake air temperature in the intake manifold.
    
• Knock Sums Cyl. 1
  •  Knock Sums for cylinder number 1
• Knock Sums Cyl. 2
  •  Knock Sums for cylinder number 2
• Knock Sums Cyl. 3
  •  Knock Sums for cylinder number 3
• Knock Sums Cyl. 4
  •  Knock Sums for cylinder number 4
• Knock Sums Cyl. 5
  •  Knock Sums for cylinder number 5
• Knock Sums Cyl. 6
  •  Knock Sums for cylinder number 6
• Lambda Bank 1
  • Air fuel reading from the wideband sensors Bank 1
    
• Lambda Bank 2
  •  Air fuel reading from the wideband sensors Bank 2
• Long Term Fuel Trim Bank 1
  • Long term changes made to the fuel table for bank 1 of the engine.
    
• Long Term Fuel Trim Bank 2
  
  • Long term changes made to the fuel table for bank 2 of the engine.
• MAF 2
  • Mass air flow reading Bank 2
    
• MAF
  • Mass Airflow Reading Bank 1.
    
• Manifold Absolute Pressure
  • Intake manifold pressure
• MAP
  
  • This is also considered to be boost pressure.
• Pre Throttle Pressure Sensor
  • Pressure in the intake system before the throttle body (997.1 only)
• Short Term Fuel Trim Bank 1
  • Short term changes made to the fuel table for bank 1 of the engine.
    
• Short Term Fuel Trim Bank 2
  • Short term changes made to the fuel table for bank 2 of the engine.
• Throttle Angle
  
  • Angle of the Throttle
• Vehicle Speed
  • Vehicle Speed

List of Available Monitors:

• Actual Camshaft Angle Bank 1
  • Actual camshaft angle for Bank 1.
    
• Actual Camshaft Angle Bank 2
  • Actual camshaft angle for Bank 2.
    
• Actual Gear
  • Current transmission position.
• Battery Voltage
  • Battery Voltage
    
• Catalytic Converter Temperature (Modeled)
  • Temperature of catalytic converter. This is a modeled temperature so not 100% accurate.
    
• Cold Start Enrichment Range 0
• Cold Start Enrichment Range 1
• Cold Start Enrichment Range 2
• Coordinated Torque for Cylinder Filling.
• Current Starting Adaptation Factor
  • Amount of correction in percentage of correction when starting the car.
    
• Distance Since Power Failure
  • Distance amount since a power failure.
    
• Distance With Check Engine On
  • Distance with a check engine light on.
    
• EGT Downstream of Cat (Modeled)
  • Exhaust gas temperature behind the catalytic converter. This is a modeled temperature so not 100% accurate.
    
• EGT Upstream of Cat (Modeled)
  • Exhaust gas temperature before the catalytic converter. This is a modeled temperature so not 100% accurate.
    
• Engine Compartment Temperature
  • Engine compartment temperature. Measured in the back of the car.
    
• Engine Torque Loss
  
• Fuel Level.
• Maximum Torque
  • Maximum torque value
    
• Minimum Torque
  • Minimum Torque Value
    
• Nominal Throttle Plate Angle
  • Actual Throttle Angle
    
• Operating Time Since Power Failure
  • Amount of time since power failure.
    
• Radiator Fan Request Value
  • Radiator fan on and off request.
    
• Relative Secondary Air Mass Bank 1
  
• Relative Secondary Air Mass Bank 2
  
• Set Point Torque
  • Set point torque value.
• Turbo Duty Cycle Bank 1 (Target)
  • WGDC/VTG target duty cycle from 0-100%
• Turbo Duty Cycle Bank 2 (Target)
  • WGDC/VTG target duty cycle from 0-100%
• Turbo Duty Cycle Bank 1 (Actual)
  • WGDC/VTG actual duty cycle from 0-100%
• Turbo Duty Cycle Bank 2 (Actual)
  • WGDC/VTG actual duty cycle from 0-100%
    
• Target Camshaft Angle Bank 1
  • Target camshaft position for Bank 1.
    
• Target Camshaft Angle Bank 2
  • Target camshaft position for Bank 2.
    
• Target Firing Angle of Torque Intervention
  • No Description.
    
• Target Idle Speed
  • Idle speed target.
    
• Total Mass Air Flow (MAF+Tank Vent)
  • This is a combination of MAF plus the tank vent recirc total airflow.
    
• Warm-up Cycle Counter
  • Cycle counter for the warm up cycle.

Definitions:

Link Dump:

How to Datalog:

https://cobbtuning.zendesk.com/hc/en-us/articles/200025134-How-to-Datalog

How to Change Datalog Monitors

Accesstuning: How to Change Datalog Monitors

How to Change Gauges

How to Change/Reset Displayed Gauges