Mallory Ignition Mallory HYFIRE VI Series Electronic Ignition Controls 685_6851 - Manual (Page 12)

Top Panel Operation and Features
Mallory HYFIRE ® VI 685 CD Ignition System
The Mallory HYFIRE ® VI 685 ignition system has a number of features that are set up by using
the top panel display and switches. Here is a list of the different features (or modes):
Mode 1 – This is the normal engine protection RPM limit. It is active if no other RPM limit is
selected. The range of this limiter is 1000 to 12800 in steps of 100 RPM.
Mode 2 – This is the auxiliary RPM limiter, and it is activated when 12 volts is applied to the
ORANGE wire coming out of the end panel. The range is the same as the Mode 1 RPM
limiter. This RPML will over-ride the Mode 1 RPML when it is active.
Mode 3 – This is a selectable high-speed timing retard. It is selected when the YELLOW
wire coming out of the end panel has 12 volts applied. The range is 1 to 15 degrees in .1
degree steps.
Mode 4 – Start retard value. This amount of retard is applied whenever the engine RPM is
below 500. The range is .1 to 10 degrees in .1 degree steps.
Modes 5 and 6 – These two control the built-in RPM activated “window” switch. Mode 5
sets the RPM where the switch activates, and mode 6 sets the RPM where the switch
de-activates. This is useful if, for example, you want to have your nitrous system only
work within a certain RPM range. The output wire for the RPM switch is the VIOLET wire
coming out of the end panel. It is connected to ground when the switch is active, and has
a maximum current rating of 10 amps. NOTE: The RPM range for this switch is 1000 to
12, 8000 and the off RPM (mode 6) must be at least 100 RPM higher than the on RPM
(mode 5).
Mode 7 – Tach test. This feature allows you to check the accuracy of your tachometer
and any accessories connected to the tach output terminal. It also will activate the built-in
RPM switch in the Hyfi re. To use the tach test feature, turn the ignition switch on without
starting the engine. Select mode 7. Turn the ignition switch off briefl y, then back on again.
The HYFIRE
® will be generating a signal at the tach output terminal at the RPM displayed
on the top panel. You can use the UP and DOWN arrow keys to change the RPM to the
desired value.
To return to normal operation, select mode 1. Turn the ignition switch off. The next time the
ignition switch is turned on, the HYFIRE
® will be out of the tach test mode.
Mode 8 – Boost timing retard degrees per PSI of boost. If you have an optional MAP sensor
connected, the HYFIRE
® 685 will retard the timing as the boost pressure increases. Mode 8
tells the system how many degrees to retard the timing for each pound of boost. The MAP
sensor plugs into the 3 wire connector that comes out of the front panel. If you don’t have a
MAP sensor installed, this function has no effect.
Mode 9 – Cylinder number select. Set this to however many cylinders your engine has. The
range is 3 to 12, even-fi re ONLY!
Mode A – MAP sensor select. There are two MAP sensors available that are compatible
with the HYFIRE
® 685. One is a 2 Bar sensor (Accel P/N 74776), which is good for about
15 PSI of boost, and the other is a 3 Bar sensor (Accel P/N 74777), good for about 30 PSI
of boost. Use mode A to tell the HYFIRE
® 685 which sensor you are using. If you don’t have
a MAP sensor installed, this function has no effect.
To use the boost retard feature, you must use the Mallory P/N 29785 harness and
appropriate MAP sensor, as referenced above. Both the harness and the MAP sensors are
available separately.
BYPASS CONNECTOR
The Bypass Connector (standard ignition bypass) fi ts into the mating plug of the Ignition
Control Harness to convert back to standard ignition. If you use the Bypass Connector,
use ignition ballast resistors designed for the particular distributor and coil in the wire from
the ignition switch. DO NOT put the Bypass Connector into the mating plug of a Mallory
HYFIRE
® VI RPM Limiting Adapter, or Single or Multi Stage High Speed Retard. DO NOT
put the Bypass Connector into the mating plug of a Mallory Electronic Advance Computer
or Remote Timing Control. Use the Power Plug to convert back to standard ignition. Also, if
you are using a Mallory Fuel Injection/Tachometer Adapter (Part No. 29074), disconnect it
(and its diode if used) as part of converting back to standard ignition. The Bypass Connector
(standard ignition bypass method to convert back to standard ignition) does not work with
magnetic pickup distributors or crank trigger ignition.
FIGURE 20
MODE
MODE VALUE
MICROPROCESSOR CONTROLLED CD IGNITION SYSTEM
A. MAP SENSOR
9. CYLINDER NUMBER
8. BOOST DEG/PSI
7. TACH TEST
6. RPM SWITCH HIGH
5. RPM SWITCH LOW
4. START RETARD
3. SELECTABLE RETARD
2. AUX RPML
1. MAIN RPML
PART No. 685
R R ®
PUSH THESE TO
RAISE OR LOWER
THE SELECTED
MODE VALUE
THIS WILL BLINK
DURING CRANKING
IF THE TRIGGER
SIGNAL IS PRESENT
PUSH THIS BUTTON TO
SELECT THE MODE
FIGURE 19
11