Haltech E6K User Manual
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4.7.7 Bar Increments -
¦i
¦i
¦i
¦i
The Up and Down arrows,
£
£
£
£
¢
¢
¢
¢
, normally change the bar height in the maps by a pre-
determined amount, usually the smallest possible increment. PgUp and PgDn change the bars
also by a pre-determined amount. These increments (the value of the keystroke) can be
changed by the user.
¦i
¦i
¦i
¦i
will bring you to a screen where the increments themselves can
be changed.
Normally, the bars are altered by adding or subtracting a fixed amount. The adjustment keys
may instead apply a percentage change on each keystroke.
¦p
¦p
¦p
¦p
on the Bar Increment
Screen will switch to percentage increments,
§f
§f
§f
§f
will return you to fixed increments.
¦l
¦l
¦l
¦l
will space out increments evenly between the Up/Down Arrows field and the Ctrl
PgUp/PgDn field. The result of this operation will be displayed once the field is refreshed,
this can be done by highlighting the field.
4.8 Duty Cycles
Fuel delivery is obtained by pulsing the injectors synchronised with the engine speed,
allowing fuel to flow during the period that the injector is open. The time whilst open is called
the injector pulsewidth. As rpm increases it is possible for pulsewidths to overlap so that the
injectors are effectively switched completely on. This is referred to as 100% duty cycle.
When 100% duty cycle is reached the fuel flow from the injectors has reached its maximum.
Increasing revs brings with it the danger of an engine lean out.
WARNING:
LEANING OUT AN ENGINE WILL CAUSE DAMAGE TO THE
ENGINE IN MOST CASES.
CARE SHOULD BE TAKEN THAT THE ENGINE CANNOT REV
ABOVE THE POINT WHEN 100% DUTY CYCLE IS REACHED AS
THERE IS A DANGER THAT DAMAGE WILL BE CAUSED TO THE
ENGINE
The tables and graph below show the point at which the injectors will reach 100% duty cycle.
It is not common for this to happen but the potential for damage under these circumstances is
strong so care should be taken to check this factor.
Maximum Injection Time (in milliseconds[ms]) =
(120,000 x IgnDivideBy)
(Rpm x No. Cylinders)
eg. Maximum injection time for a four cylinder, on ign/by 2 red-lining at 6000 RPM is
(120,000 x 2)/(6000 x 4) = 10,