Haltech E6X Manual DOS Version - Manual (Page 44)

E6X Manual
44
Road Speed Value
This value calibrates the Road Speed reading. The value represents the number of
pulses received from the road-speed sensor over a distance of 1 km.
4.2.2 Fuel Set-up Page
The fuel set-up page contains information about the fuel system. The Fuel Set-up Page is
accessed via the set-up menu.
The fields in the fuel set-up page are as follows:
Ign / By
Ignition Divide By is the number of ignition pulses that will be counted until the next
injection pulse. For almost all multipoint systems, injection should occur once per
revolution so Ignition Divide By should be set to half the number of cylinders. If the
system is operating in Batch Fire or Sequential mode, or is a rotary, then a value of 1
is suggested.
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
closed throttle. This feature can be enabled or disabled. It is better, when first tuning,
to disable this function.
Injection Mode
The ECU can operate in 4 different injection modes depending on the application
these are:
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 outputs 1 and 2
fire all the time, just as in a multipoint set-up. When the boost pressure exceeds a
programmed value, injector outputs 3 and 4 are enabled.
The staged injectors are normally upstream of the primary injectors. The point at
which the ECU switches in the secondary injectors is set via the Staging Bar Number
field which is described below. Staging permits high fuel-flow capability, but
maintains accuracy and controllability at light load and idle.
Sequential injection fires the injectors sequentially meaning the fuel can be injected at
precisely the right time, this is particularly useful for engines with large duration
cams. This not a straightforward set-up, it requires more outputs for fuel than
normally used.