Mallory Ignition ACCEL timing computer 49340 - Manual (Page 7)

S ETTING V ACUUM A DVANCE / B OOST R ETARD
The A CCEL Timing Computer can program Vacuum and Boost when Manifold Absolute
ressure is read with a 2-Bar MAP Sensor. When Vacuum Advance or Boost Retard takes
ffect, the whole Base Timing Curve either Advances or Retards. ( MAP S ensor info Pg 4 )
When Retarding timing, the number displayed is subtracted from the Base Timing Curve.
When Advancing timing, the number displayed is added to the Base Timing Curve.
(Timing, however, can never exceed Maximum Timing.)
Decide how much timing to add for maximum vacuum, and how much to subtract for
maximum boost. Program both values into the Timing Computer by pressing VAC ADV,
or B OOST R ETARD buttons, and adjusting the number displayed with the ⇑ or ⇓ buttons.
I . E . If you want 5° extra Advance for maximum vacuum (throttle closed) - press the
VAC ADV button, adjust the display to read 5°, then press the SAVE button.
Assume the Base Curve’s timing is set to 25° at 5,000 RPM - taking your foot
off the
throttle at that speed ramps timing up to 25° + 5° = 30°.
As always; press the SAVE button and wait for the display to stabilize to store new values.
RPM-A CTIVATED S WITCHES
here are two RPM-Activated switches: one with R ED & W HITE and B LACK & P INK wires, and
ne with B ROWN and P INK wires. In each connector, one wire provides battery power and
he other wire is switched to ground inside the Timing Computer. Connect any RPM-
ctivated device (Shift Light, Air Shifter, N 2 O Actuator) to either one.
Setting the B ROWN
and P INK Connector
1 . Press RPM and B OOST R ETARD
at the same time.
2 . Adjust the value displayed with the
⇑ and ⇓ buttons.
3 . Store new value with the SAVE button.
Setting the R ED & W HITE
and B LACK & P INK Connector
1 . Press RPM and N 2 O R ETARD
at the same time.
2 . Adjust the value displayed with the
⇑ and ⇓ buttons.
3 . Store new value with the SAVE button.