Mallory Ignition Mallory HYFIRE VII Series Electronic Ignition Controls 667C - Manual (Page 5)

Your Mallory HYFIRE ® 667C has a number of built-in features that make it
easier to use. This instruction addition tells how to use these built-in features.
First, take a look at the top of the main unit. You'll see that there is an 8-pin
connector beneath the surface, Supplied in the plastic bag that came with
your Hyfire is an 8-pin plug that fits this connector. It has screw clamp ter-
minals that accept up to 14 gauge wire. For best results, use stranded , insu-
lated copper wire, rather than solid wire. The plug is made so that it will only
fit one way, and has hold down screws at each end.
The connector and mode descriptions are listed below:
RPM switch:
The built-in RPM switch can either turn an electrical load off or on at a select-
ed RPM. See below for more detail.
NC This is the RPM switch (mode 7) relay contact that is normally closed.
In other words, as long as you haven't reached the point where the
RPM switch is active, this contact remains connected to the "com-
mon" or "C" terminal. You would use this connection if , for example,
you wanted to turn something OFF (such as a nitrous system) when
you reached the RPM switch point. See example 1.
C This is the common terminal for the RPM switch (mode 7) relay in the
main unit. It is connected to the RPM switch, where it will switch the
accessory connected to the "NC" terminal OFF, and the accessory con-
nected to the "NO" terminal ON when the RPM switch value is
reached. The "C" terminal can be used to switch either to power or
ground.
NO This is the RPM switch (mode 7) relay contact that is normally open.
In other words, as long as you haven't reached the point where the
RPM switch is active, this contact isn't connected to the "C" contact.
You would use this contact to turn something ON (such as a shift light
or an air shifter) at a specific RPM. See example 2 and example 3.
RPM Limiters:
The HYFIRE ® 667C has three built-in RPM limiters. Each one has a range of
1000 to 12,800 RPM in 50 RPM steps. On the main display, there is a deci-
mal point on the mode digit. When that decimal point is lit up, the RPM limit
is increased by 50 RPM.
RPM1 (Mode 1) This is the RPM limit that is always active if you haven't
selected any other RPM limit.
RPM2 (Mode 2) This is an auxiliary RPM limiter that is activated when you
apply 12 volts to the "RPM2" terminal on the top-side connector. This
could be a burnout limiter. When selected, it over-rides RPM1 (the
main engine protection RPM limiter). See example 4.
RPM3 (Mode 3) This is the other auxiliary RPM limiter. It also is activated by
12 volts on the "RPM3" terminal on the top-side connector, and over-
rides both RPM2 and RPM1. Use this limit as a staging (starting-line)
RPM limiter. See example 5.
High-Speed Timing Retards:
RET1, RET2, RET3 (Modes 4,5,6) These are all high-speed timing retard
functions that are activated by 12 volts on the appropriate top-side connector
terminal. Each higher stage over-rides the lower stages, which means that
you set each stage for exactly the amount of retard you want, rather than
adding up each stage to get the actual retard. See example 6.
NOTE: When you apply 12 volts to RPM2, RPM3, RET1, RET2, or RET3 the
display will switch to show that function. If you have both an auxiliary
RPM limit AND a retard selected, the display will show the retard value.
See the accompanying illustrations for some examples of how to use the
RPM limiters, the RPM switch, and the timing retard functions.
NOTE: When activating Modes 2, 3, 4, 5, or 6, the display will change to
show the active mode. If more than one mode is activated, the higher
mode number will be displayed.
USING THE HYFIRE VIIC FEATURES
®
Push this button to change the mode
FIGURE 4
Push either of these
buttons to change
the value of the
selected mode.
NOTE: If any button is held down for more than 1/2 second,
the displayed value will change automatically.
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