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Injector

Injector lag

The injector lag is the difference between the pulse duration on the injector and the actual time of the open state of the injector.

The lower the supply voltage, the more time the injector needs to open.

The accuracy of the settings in this table directly affects the accuracy of the injection time calculation. Incorrect values of the lag cause RPM and AFR instability when idling.

If two rows of injectors are used, the first row lag is calculated from set #1, the second-row lag from set #2.

Injector performance by injection time

At low injection time, the injector has a nonlinear performance characteristic. This is especially pronounced in injectors with high productivity and in gas injectors. With this table, you can adjust the fuel supply depending on the injection time.

The injection time in the table is the net injection time without the injector lag.

Injection time multiplier

Adjusts the total injection time. Designed to adjust to specific injectors. When replacing the injectors and / or changing the pressure in the fuel rail, it is enough to adjust the multiplier according to the lambda readings.

Additive correction

Adds a fixed value to the injection time.

Min Injection Time

Specifies the injection time below which the injector does not open. The setting is useful for large and slow injectors (such as gas injectors), as well as when setting up depletion to eliminate dips. The value is set to 14v

PWM Injector Driver

Enables pwm driver for low-impedance injectors (provided that the driver is installed in the unit)

Impulse of discovery

Specifies the duration of the injector opening pulse. Typically, this value is specified by the manufacturer.

PWM Hold

Regulates the holding current of the injector.

To select the value - connect the current meter in series to the injector No. 1, turn on the PWM test, and select the value to obtain the passport value of the hold current (usually 1-2A)

Fuel consumption

To calculate fuel consumption, you need to set the performance of the injector.

If there is no speed sensor, only the total amount of fuel consumed in liters and the instantaneous consumption in l / hour will be taken into account.

Methods of adjusting the injector lag

Method 1 (Batch - Phased injection switcheing)

  1. Disable lambda control.
  2. At idle, switch between batch and phased injection modes.
  3. Pick up the lag of the injector until the AFR is kept stable when switching.

This method works only at relatively high injection times, at least 2 times the opening time of the injector.

Method 2 (AFR switching)

  1. Disable lambda control.
  2. Specify the rich AFR in the AFR map (11-12). Adjust the filling so that the actual AFR is equal to the target AFR
  3. Set the poorest AFR at which the engine runs stably (usually 16-17). Adjust the injector lag so that the actual AFR is equal to the target AFR.
  4. Repeat steps 2-3 until you achieve the most accurate hit of the real AFR in the target.