1 Intro:
2 Staged Injection:
- 2.1 Tables:
  - 2.1.1 Setup Tables:
    - 2.1.1.1 Multi-Fuel Enable
    - 2.1.1.2 Secondary Injector Enable
    - 2.1.1.3 Staged Injection Output Select
  - 2.1.2 Activation Thresholds:
    - 2.1.2.1 Calibration Note
    - 2.1.2.2 Boost Activation Threshold
    - 2.1.2.3 Boost Hysteresis
    - 2.1.2.4 Engine Load Activation Threshold
    - 2.1.2.5 Engine Load Activation Hysteresis
    - 2.1.2.6 Engine Speed Activation Threshold
    - 2.1.2.7 Engine Speed Activation Hysteresis
    - 2.1.2.8 Injector Duty Cycle Activation Threshold
    - 2.1.2.9 Injector Duty Cycle Hysteresis
    - 2.1.2.10 Minimum Staged Inj. Pulsewidth
    - 2.1.2.11 Minimum Staged Inj. Pulsewidth Hysteresis
  - 2.1.3 Primary Fuel Settings:
    - 2.1.3.1 Primary Fuel Density (Multi-Fuel)
    - 2.1.3.2 Primary Fuel Stoich. Ratio (Multi-Fuel)
    - 2.1.3.3 Primary Injector Flow
  - 2.1.4 Secondary Fuel Settings:
    - 2.1.4.1 Secondary Fuel Base Pressure (Multi-Fuel)
    - 2.1.4.2 Secondary Fuel Commanded Lambda (Multi-Fuel)
    - 2.1.4.3 Secondary Fuel Density (Multi-Fuel)
    - 2.1.4.4 Secondary Fuel Stoich Ratio (Multi-Fuel)
    - 2.1.4.5 Secondary Injector Flow
    - 2.1.4.6 Secondary Injector Latency
  - 2.1.5 Transition Fueling:
    - 2.1.5.1 Transition Compensation (Staging)
    - 2.1.5.2 Transition Compensation (De-Staging)
- 2.2 Monitors:
  - 2.2.1 Fuel Pump (Sub) Status
  - 2.2.2 Inj. Duty Cycle
  - 2.2.3 Inj. Duty Cycle (Staged)
  - 2.2.4 Inj. Pulsewidth 1 Final (Post Compensation)
  - 2.2.5 Inj. Pulsewidth Cyl. 1
  - 2.2.6 Staged Injection Airmass Ratio
  - 2.2.7 Staged Injection Corrected Lambda
  - 2.2.8 Staged Injection Cycle Counter
  - 2.2.9 Staged Injection Secondaries Active Status
  - 2.2.10 Staged Injection Secondary Injector Latency
  - 2.2.11 Staged Injection Secondary Lambda
  - 2.2.12 Staged Injection Staged Pulsewidth
  - 2.2.13 Staged Injection Threshold Flags
  - 2.2.14 Staged Injection Transition Compensation
- 2.3 How to Tune:
  - 2.3.1 Mechanical and Electrical Systems Setup:
  - 2.3.2 Accesstuner Calibration:
    - 2.3.2.1 Tune with the Primary injectors only at first
      - 2.3.2.1.1 Example Files
    - 2.3.2.2 Double Check VE Table
    - 2.3.2.3 12- Injector setup
    - 2.3.2.4 Activation Thresholds
    - 2.3.2.5 Enable and Set up staged Injection Activation Triggers
    - 2.3.2.6 Primary Injector Fuel Settings: Primary injector Flow and Latency
      - 2.3.2.6.1 Example Files
    - 2.3.2.7 Running 12 Injectors
      - 2.3.2.7.1 Example Files
    - 2.3.2.8 Tuning the Activation

Intro:

With the introduction of the COBB Staged Injection and Multi-Fuel system, we've added a bunch of features, tables and monitors to allow you to tune the car with an extra 6 injectors that can supply additional fuel through either the stock fuel system, or through a secondary system. We also supply tables that allow you to run a different injector size from your primary set allowing you to achieve stock-like driveability and idle quality, with the fuel delivery available to make big power. The use of a secondary fuel system also allows you to take advantage of the software's ability to deal with multiple fuels and still achieve target air/fuel ratios even when using fuels with significantly different stoichiometric points like methanol.

Staged Injection:

Tables:

Setup Tables:

Multi-Fuel Enable

This table will enable the ability to run a second fuel type through your staged injection system. Allowing the use of other fuels like methanol etc. in conjunction with a separate fuel for your primary system. The COBB Multi-Fuel system allows you to apply your own fuel density and stoichiometric ratio to the secondary fuel system to allow the appropriate amount of fuel to be delivered.

Values

A value of 1 in this table will enable the system, while a value of 0 will leave it disabled, allowing the staged injection system to run off of the primary fuel systems settings.

Additional Required Items for Use

A completely separate fuel system for the staged injection system consisting of a fuel cell/tank, pumps, fuel pressure regulator and fuel lines.

Tables activated and used by this system

Secondary Injector Enable

This table will enable the ability to run a secondary set of injectors.

Values

A value of 1 in this table will enable the system, while a value of 0 will leave it disabled. When activated it will allow the staged injection system to operate in conjunction with the primary (stock) fuel system to achieve your targeted fueling.

Tables activated and used by this system

Staged Injection Output Select

This feature has been updated, and selecting the secondary air injection as an output is no longer available. This system will now only be activated through the secondary fuel pump output circuit.

Air injection output has been deprecated and is no longer able to be selected in the software.

End User Greenspeed Update

Dealer Greenspeed Update

This table selects the output for the secondary injection activation. Currently it is only able to go out through the secondary fuel pump circuit.

Activation Thresholds:

Calibration Note

We suggest setting activation and hysteresis values to avoid de-staging while remaining at high engine load. During de-staging fuel is stripped from the manifold walls upstream of the primary injectors, which doesn't occur in a smooth linear fashion. The result temporary fueling may be a concern while at high engine load, but is NOT a concern when the driver releases the throttle after a pull. During lift throttle, fuel cut will stop all injection, and the wall film from all injectors will be consumed uneventfully.

An example of activation settings which might induce the condition we are advising against would be: setting all activations very low, and using Minimum Staged Inj, Pulsewidth as the primary activator, with a small hysteresis. Pulsewidth generally follows the torque curve. If the torque curve tapers as the engine revs out, as many setups do, you may fall below Minimum Staged Inj, Pulsewidth and hysteresis, causing the system to de-stage at high RPM while at WOT.

Regardless of the activation thresholds you choose, using sufficient hysteresis values is another way to avoid destaging during pulls.

Another example of a way to avoid this would be using Injector Duty Cycle Activation Threshold as your primary activator, since duty cycle will continue to increase throughout the powerband. Keep in mind duty cycle will drop during high load gear changes, and set staging activations accordingly.

Boost Activation Threshold

Sets the manifold relative pressure threshold above which the secondary injection system will be allowed to activate.