Cobb Accessport Install and Use Guide
Basic guidance on how to install your Cobb Accessport, log data and how to get your Pro Tune on your GT car.
Most of this is adapted directly from Cobb. Here are some helpful links:
Begin by connecting your car to a battery charger. DO NOT SKIP THIS STEP!
-You can “brick” your ECU if the battery dies while uploading a tune.
Taken directly from Cobb’s Quick Start Guide:
Install the Accessport on to your Car
When you first install the Accessport by selecting Install from the main menu, the Accessport will recognize your vehicle, save your factory ECU data, load the proper maps from the background memory, and then flash your vehicle’s ECU with the map you select. This process ties (“marries”) the Accessport to your vehicle and it will remain this way until you uninstall the Accessport from the vehicle. An Accessport can only be used on one vehicle at a time.
If you have ordered a Pro Tune from Dundon, please keep in mind that your Pro Tune is NOT pre-loaded onto your Accessport. Please follow the steps below to receive your tune file.
Once the Accessport has been successfully installed, on the main screen of the device there is a “?” icon - About This Accessport. The screen should look like this:
Once there, move to the next screen with the direction keys. This screen will tell us the “Software Version” of the ECU.
Once you have determined the Software Version, please send an email to Support@DundonMotorsports.com with the following:
First and Last Name:
Order Number (for Cobb and/or Pro Tune):
Year, Make, Model:
Any applicable modifications:
Software Version:
Please allow 24-48 hours for a response (often the response time will be quicker, but some tunes will need to be built) and we will send an initial tune file to work from.
Once you receive the tune file, transfer the file to the Accessport via Cobb’s Accessport Manager software (download found here). Please reference the links at the top of this article for guidance on how to accomplish this.
Data Logging and Revisions
As part of our Pro Tune service we offer a revision for your specific car and your specific climate. If you wish to take part in this, please log some driving data and send them to us by way of a reply to your original email request (that helps us keep track of things).
To log the data follow these instructions (see required parameters below):
https://cobbtuning.atlassian.net/wiki/spaces/PRS/pages/571899907/How+To+Datalog
Typically a 15-30 minute drive throughout the rev range with a couple of good 2nd and 3rd gear pulls to redline will provide us with everything needed to optimize your tune (again, please log all parameters). Once we receive the data log, we will turn the revision around in 24-48 hours and the installation process is the same as your initial file.
Required Logging Parameters (car specific)
991 GT3/GT3RS:
AFR B1
AFR B2
AFR Commanded
Accelerator pedal position
Boost Pressure
Cam angle B1
Cam Angle B2
Cam angle set point
Coolant temp
ETC Target
ETC Actual
Engine Temp
Current Gear
IAT
Ignition Timing Final
Knock Retard CYL1
Knock Retard CYL2
Knock Retard CYL3
Knock Retard CYL4
Knock Retard CYL5
Knock Retard CYL6
Load Actual
Long term fuel trim b1
Long term fuel trim b2
MAF
Oil temp motor
RPM
Relative manifold pressure
Short term fuel trim b1
Short term fuel trim b2
Target boost pressure
Target filling
Vehicle speed
997.1 & 997.2 GT3/RS
Actual Camshaft angle 1A
Actual Camshaft angle 1B
Actual Camshaft angle 2A
Actual Camshaft angle 2B
Battery Voltage
Catalytic converter temp
Coordinated Torque for cylinder filling
EGT upstream of Cat
Engine oil temp
Engine RPM
Engine Temp
Ignition Angle (actual)
Ignition set point for Torque intervention
Injection Time
Intake Air Temp
Knock CYL1
Knock CYL2
Knock CYL3
Knock CYL4
Knock CYL5
Knock CYL6
Lambda B1
Lambda B2
Load (relative)
Load RLP
Long term Fuel Trim B1
Long term Fuel Trim B2
MAF
Nominal throttle angle
Short term Fuel Trim B1
Short term Fuel Trim B2
Target Camshaft Angle B1
Target Camshaft Angle B2
Throttle Angle
Vehicle speed
981 GT4 & 991 C2S
Engine Load
Engine Oil Temp
Engine Speed
Engine Temp (actual)
Exhaust Gas temp 1
Exhaust Gas temp 2
Fuel Pressure actual
Fuel Pressure Target
Gear
Ignition Timing
Ignition Timing Correction CYL1
Ignition Timing Correction CYL2
Ignition Timing Correction CYL3
Ignition Timing Correction CYL4
Ignition Timing Correction CYL5
Ignition Timing Correction CYL6
Injector Fuel Flow
Intake Air Temp
Intake Cam (target)
Intake Cam 1 Actual
Intake Cam 2 Actual
Lambda B1
Lambda B2
Large Lift Request
Long Term Fuel Trim 1
Long Term Fuel Trim 2
MAF
Map Actual
Map Target
Oil Pressure actual
Pedal Position
Predicted air mass
Short Term Fuel Trim B1
Short Term Fuel Trim B2
Throttle actual
Throttle target
Vehicle speed