User Manual

SETTING VACUUM ADVANCE / BOOST RETARD
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 Sensor 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
BOOST
RETARD
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-ACTIVATED SWITCHES
here are two RPM-Activated switches: one with RED&WHITE and BLACK&PINK wires, and
ne with
BROWN and PINK 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, N2O Actuator) to either one.
Setting the BROWN
and PINK Connector
1. Press RPM and BOOST RETARD
at the same time.
2. Adjust the value displayed with the
⇑
and
⇓
buttons.
3. Store new value with the SAVE button.
Setting the RED & WHITE
and BLACK & PINK Connector
1. Press RPM and N2O RETARD
at the same time.
2. Adjust the value displayed with the
⇑
and
⇓
buttons.
3. Store new value with the SAVE button.