Mallory Ignition ACCEL Digital Fuel Injection Engine Management System 74030 - Manual (Page 12)

10
ACCEL/DFI
The total advance to which you set the engine will depend
upon the engine you have. Vacuum advance should be
controlled with the EGR port, which is located before the
throttle blades. ACCEL DFI recommends a distributor with
an adjustable vacuum advance. Once the total advance is
set, connect the vacuum line to the canister. Adjust the can-
ister to maintain 20-26 degrees with a hot idle at 800 RPM.
Again, this is ACCEL’s recommendation, depending upon
compression ratio and cam profile, you may have to
decrease this to avoid detonation.
COMPUTER-CONTROLLED IGNITION
If you are using a TFI distributor you will need to connect
the TFI adapter harness to the 4-pin black ignition control
connector on the MWH. After doing so you can plug the
6-way end into your TFI distributor; the 1-pin black
connector will go to the negative side of your ignition coil
or points/lead of your enhancer box. You can also control
timing by using a magnetic pick-up distributor or crank
trigger. In order to do so you must get a modification done
to your ACCEL DFI ECM (ACCEL DFI part number
74043-I). This modification will come with the necessary
wiring (this wiring with replace the TFI adapter) but will
not come with an enhancer box that is required. If you will
need this modification, contact ACCEL DFI for further
instructions and a shipping address.
In order to set the initial timing, the ignition bypass
connectors (two 1-pin connectors) incorporated into the
ignition control leg must be disconnected. With the engine
running hot at 800 RPM, manually adjust the distributor to
6 degrees BTDC. Once adjusted, reconnect the ignition
bypass line. As soon as you connect the bypass line the
ACCEL DFI ECM regains control of the timing. The spark