4

Your Mallory HYFIRE

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

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.