Why?
The newer NexGen Flex Fuel is different from what was offered in the past including the physical kit, how it was implemented in the software/on the car, and to a lesser extent how you will tune it.
How to Update Maps
In order to bring your maps forward, you’ll need to import all of your table changes into a COBB CCF (Custom Features Gen3) ROM
Open a CCF Gen 3 File
Under the FILE heading, select Import Tables From Map. You’ll be presented with a list of table differences, go ahead and import those to your new map file.
At this time, once the import is done, you’ll want to review the changes made to make sure nothing was missed. Sometimes if table sizes are different or the datatype has changed tables won’t be copied at all (or incorrectly). This is more common when comparing or importing between model years or different vehicles.
You’ll need to set values for the new NexGen Flex Fuel tables.
Custom Sensor Input Activation (0 = Disabled, 1 = Enabled)Custom Sensor Input Calibration
Custom Sensor Input Smoothing Factor
Ethanol Sensor Activation
Ethanol Sensor Concentration Override Always (0 = Disable, 1 = Enable)
Ethanol Sensor Concentration Override Always (0 = Disable, 1 = Enable)
Flex Fuel Feature Activation (0 = Disable, 1 = Enable)
Fuel Pressure Activation (0 = Sensor Disabled, 1 = Enable)
Fuel Pressure Differential Feature (0 = Disable, 1 = Enable)
What doesn’t exist TLDR
Flex Fuel Changes
The following tables have been removed and no longer need to be tuned. They’ve been pre-calibrated with the default values for the COBB NexGen FF kit. This means a bunch of the guess work and starting effort for a map is already done for you.
Ethanol Sensor Calibration
Ethanol Sensor Calibration Deadband Range (Abs. Delta)
Ethanol Sensor Calibration Sampling Rate
Ethanol Sensor Calibration Smoothing Factor
Ethanol Sensor DTC Delay (High)(C0BB2 DTC)
Ethanol Sensor DTC Delay (Low)(C0BB1 DTC)
Ethanol Sensor DTC Limit (Voltage)(High)(C0BB2 DTC)
Ethanol Sensor DTC Limit (Voltage)(Low)(C0BB1 DTC)
Activation Changes
Toggles are going to be slightly different and will need to be changed to correspond to whatever sensors you’re using. The ECU will try to process the NexGen module signal when ANY of these toggles are enabled. This means the module is required in order for other sensors to be read properly even if the ethanol sensor is not actively used.
Ethanol Sensor Activation
0 = Deactivated
1 = COBB Nex Gen Flex Fuel Kit with ethanol sensor activated
Fuel Pressure Activation
0 = Deactivated
1 = COBB Nex Gen Flex Fuel Kit installed with fuel pressure sensor harness on TGV Right input (between FF harness and Engine harness) Flex fuel does not need to be active, but harness must be present
Custom Sensor Input
0=Deactivated
1= Activated with custom sensor installed on TGV Right input (between FF harness and Engine harness) Flex fuel does not need to be active, but harness must be present
Additional Sensor Input Changes (Fuel Pressure)
You can only use one additional sensor input (Fuel Pressure or custom sensor inputs) and it MUST be plugged into the TGV-R input between the NexGen FF harness and the stock engine harness.
Additional sensor input requires the NexGen FF kit to be installed even if the ethanol sensor is not actively used.