Haltech F10 User Manual

Page 34

The valid values for this parameter are: 1, 2, 3, 4, 5 and 6

Decel Cut-Off

A common fuel saving feature in original equipment computers is a fuel cut-off on
deceleration. This will cut fuel delivery to the engine while coasting down hills with a
closed throttle. This feature can be enabled or disabled on the F10. It is better, when
first tuning, to disable this function.

The valid values for this parameter are: Enable and Disable

Injection Mode

Depending on the ECU settings the F10 splits its four (F10 and F10A) or eight (F10-8
and F10A-8) injector driver outputs into two banks (see chapter 13, 13.1). INJ1 and

INJ2 comprise the first bank. INJ3 and INJ4 form Bank 2. The fuel can be injected in
three different modes.

Multipoint injection fires all the injectors together. This is the most common set-up
and will normally be used on engines with multipoint injection manifolds (one injector

per cylinder).

Batch-fire injection is usually used in throttle body or non-turbo rotary set-ups and
fires the two banks of injectors alternately. On eight and twelve injector fuel rails, with
high-flow injectors, this may also help reduce fuel pressure oscillations caused by all

injectors pulsing together.

Staged injection is usually used on high boost turbo engines. Injector Bank 1 fires all
the time, just as in a multipoint set-up. Beyond a set boost pressure, the second bank
of injectors is enabled. These "staged" injectors are normally upstream of the primary

injectors, adding to their fuel flow. The point at which the F10 switches in the
secondary injectors is set via the Staging Bar Number field. Staging permits high fuel-
flow capability, but maintains accuracy and controllability at light load and idle.
(Refer C.3 Injector Staging, 90).

WARN ING:

WHEN FINISHED SETTING THE INJECTION MODE, SEE

CHAPTER 13.1

(INPUT/OUTPUT PAGE) TO SET THE INJ 1 - 4 DRIVERS TO THE

CORRECT STATE: EN ABLED OR DISABLED:

THIS IS IMPORTANT AS THE EC U WILL NOT OPERATE
CORRECTLY IF THE INJ 1-4 DRIVERS HAVE NOT BEEN

CONFIGURED PROPERLY. AT WORST, SOME INJECTORS MAY

NOT FIRE OR THE INJECTOR DRIVERS MAY DESTRUCT AFTER

A PERIOD OF TIME.

F10 AND F10A ONLY

THE F10 AND F10A ARE NOT CAPABLE OF DRIVING 8 LO W

IMPED ANCE INJECTORS. THESE ECU DO NOT HAVE THE

EXTRA INJECTOR DRIVERS MENTIONED ABOVE.