Haltech E8 - Manual (Page 44)

Haltech E11/E8 Instruction Manual
Throttle Pump Map Enable - Click on this check box to enable throttle pumps enrichment.
• Injectors Enable - Click on this check box to enable the injectors. This feature is often used when
setting up ignition timing.
• Injector Current Setup – Haltech ECUs have intelligent injector control circuitry that allows for
many different makes and models of injectors to be run without the need for resistor packs. For this
circuitry to control each injector correctly the ECU must have the injector current control
programmed by the user for the injectors being used. To determine how much current each injector
requires it is very simple. Current can be calculated using Ohms Law (V = I / R), in an automotive
electrical system the supply voltage is assumed at 12V. Using Ohms law R is simply the resistance
of the injector. So to determine the peak current required for an injector simply take 12 divide by
Injector Resistance (measure injector resistance between the two electrical connectors on the
injector). For example, an injector with 4 Ohm resistance has a peak injector current draw of
12 / 4 = 3 Amps
Figure 38 – Injector Current Control Setup Screen
• Injection Mode - Choose the mode of injection to run for your engine.
• Sequential mode - Is the preferred mode wherever possible, which fires each injector
individually in reference to the intake valve opening time, a crankshaft reference signal is
required. Injection timing is tuned using the end of injection map found in the fuel maps menu.
• Semi-Sequential - fires half the required fuel on the intake stroke and the remaining half on
the opposing half of the stroke. This is the preferred mode when only a crank signal reference
is available (ie no camshaft signal is required).
• Batch mode - Injection fires the injectors in two even groups. This is aimed at reducing fuel
rail pressure fluctuations. This mode of injection does not require any home (camshaft) signal
to operate. The angle of injection is not defined, and the injection angle map is not used. The
frequency of injection is defined by the Ignition Divide By parameter. Batch mode is not to be
used on engines with odd numbers of cylinders or 6 cylinder engines. Ignition divide by should
be set to number of cylinders / 4.
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