Mallory Ignition ACCEL timing computer 49340 - Manual (Page 6)

S ETTING T IMING – A B ASE C URVE
he A CCEL T IMING C OMPUTER has been designed to automatically Advance or Retard your
gnition timing to meet changing conditions. You must program a Base Timing Curve
efore it can make any adjustments. The Base Timing Curve is the timing that takes effect
t specific RPM and atmospheric pressure (no Vacuum, no Boost, no N 2 0, open throttle ).
he Base Curve, and all future adjustments, are done in 1° per 500 RPM increments.
1. Begin by pressing the RPM button. Use the ⇑ and ⇓ buttons until
the LED display reads the desired RPM value (start at 0 0 0 0 0).
2. Press the T IMING button and, also with the ⇑ and ⇓ buttons,
modify the value displayed to your pre-determined value.
3. Repeat Step-1 and Step-2, increasing the RPM value displayed by
500 rpm , and modify timing until you reach your Peak RPM.
(Do NOT skip any of the 500 RPM increments!)
4. When you are satisfied with the values entered press the SAVE button,
storing all values currently in effect.
A N ALTERNATE METHOD OF REV - LIMITING – When you reach Peak RPM.
go another 500 RPM increment and retard timing by 10° – 15°.
The Timing Computer’s display at 2,000 RPM ,
when you toggle between T IMING and RPM,
or the chart, and timing curve shown above.
f the timing programmed for 1,000 RPM is 15°, and the timing for 1,500 RPM is 20°, the
Timing Computer will compute the correct timing for 1,100, 1,200, 1,300, and 1,400 RPM .
Timing will ramp up slowly from 15° to 20°. There will not be a sudden jump of 5°.
The maximum ignition advance and the trigger position are interdependent. Your A CCEL
T IMING C OMPUTER will not allow a maximum advance beyond trigger position minus 2°.
You cannot set a trigger position less than the timing curve’s maximum advance plus 2°.
Therefore - during installation some of the Timing Computer’s factory defaults may
ave to be modified to smaller values, before you can set the trigger position.