NEXGEN Flex Fuel How to Update Maps

Owned by Brandyn Mowat
Last updated: Jan 11, 2024 by Michael Sessions

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.

 

A Note on Flashing Maps
The new CCF Gen3 file is a different vehicle ID from the previous ROM files (e.g. CCF Gen2). In many cases you will need to uninstall the AP and then reinstall to the new CCF ROM as you will not be able to go directly from a CCF Gen2 to a CCF Gen3 file (or vice versa).

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

  1. Open a CCF Gen 3 File



  2. 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.

  3. 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. It’s a good idea to do this comparison with two different windows of ATP in the event that the incompatibility that makes the changes not import, says that the tables are identical with the compare function when they are not.

  4. 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)

 

A Note about A/B Table Group behavior when importing

  • For any maps that previously supported Flex Fuel (enabled or otherwise), Flex Fuel Table Group A values from the old map will import into Table Group A in the new definition (and the same goes for Table Group B).

  • For any maps that did not previously support Flex Fuel (older “MAF” maps as an example), Flex Fuel Table Group A values will be copied into Table Group B upon “Upgrading” the map. This is done by opening the older map from within the newer vehicle definition. Importing the map will not perform this copy function because the B tables do not exist in the base map.

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.

 

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