Mallory Ignition ACCEL DIS 8 75610 - Manual (Page 3)

DIS 8
3
Introduction
Congratulations on the purchase of your new Accel DFI Digital Ignition System (DIS 8).
This Multi-Strike system uses the latest available technology to offer unparalleled
accuracy, repeatability, and reliability.
The DIS 8 unit operates multiple coil applications using one of two triggering
configurations: 8-Channel Mode or Cam/Crank Mode. The DIS 8 is also capable of
timing retard and rev limit functions.
Included with the DIS 8 is a handheld controller which will allow you to have control
directly from the driver’s seat.
Cautions and Warnings: Refer to Page 25
8 Channel Mode:
In the 8 channel mode, a trigger signal (Sink signal-ground) on any input channel will
result in a coil firing on the corresponding output channel. This is true whether or not
the unit is in the waste spark or Coil-Per-Cylinder (CPC) mode. The firing order set in
the handheld controller is ignored in 8 channel mode, since that is determined by the
input triggering. The coil inputs and outputs must be wired in the correct engine firing
order. NOTE: The cylinder selection must match the actual engine configuration so
that the RPM limiters and timing retards will work correctly.
The vehicles stock ECM can trigger the DIS 8 in 8 channel mode. The trigger signal is
sent to the Coil Input Harness. The DIS 8 then sends it to corresponding coil output
harness lead witch is connected to the coil.
Cam/Crank Mode:
In the Cam/Crank mode, channel 1 input is the Electronic Spark Timing (EST) trigger,
and channel 2 input is the cam position trigger. The DIS 8 uses the EST and Cam
inputs and processes the inputs into 8 separate outputs allowing the use of coil-per-
cylinder operation. The firing order must be set with the handheld controller in
Cam/Crank mode. The crank position trigger / EST / Points Trigger signal is a rising
edge (low to high), and the cam position is a falling edge (high-to-low) transition.
NOTE CAM Sensor Must be a Hall Effect (12 volt square wave signal)
Waste Spark Mode
In this mode a coil pack is normally used, but individual coils may be used firing two
coils at once. In the waste spark mode one cylinder will fire on the compression stroke,
and the other coil will fire on the exhaust stroke. When using coil packs, a typical V8
engine will use four twin tower coils or two Ford EDIS style coils (ACCEL part
#140018). When using individual coils, the DIS 8 will fire two coils at once. The coils
must be paired with the proper firing order.
Typical Chevy Firing order 18436572 Typical Ford Firing order 13726548
Cylinder # 1 gets paired to cylinder # 6 Cylinder # 1 gets paired to cylinder # 6
Cylinder # 3 gets paired to cylinder # 2
Cylinder # 3 gets paired to cylinder # 5
Cylinder # 5 gets paired to cylinder # 8 Cylinder # 4 gets paired to cylinder # 7
Cylinder # 7 gets paired to cylinder # 4 Cylinder # 2 gets paired to cylinder # 8