Mallory Ignition ACCEL DIS 8 75610 - Manual (Page 20)

DIS 8
20
MAP Sensor Input
The Optional MAP sensor circuit retards the timing as a function of the boost pressure.
Mode “Boost Deg/PSI” sets the number of degrees retard per pound of boost. The
reference level for the boost retard system is set by reading the MAP sensor after key-
on, but before the engine starts cranking. To ensure a stable reference, turn the key
on until the control display light up, and then start the engine. Once the reference is
set, subsequent minor barometric pressure variations will not substantially change the
calibration. If you go from sea level to high altitude or vice-versa, it is a good idea to
reset the reference level, by cycling the ignition key to the OFF then ON position. A
MAP sensor that has a .2-4.8 volt output for the full range can be used. ACCEL DFI
offers 1, 2 & 3 BAR MAP sensors.
PIN Connection Wire Color
A Signal Return Blue
B MAP Signal White
C 5 Volt Reference Red
Map Sensor Sensor Range Part Number
1 BAR Vacuum Only 74764
2 BAR Vac to 15 PSI 74776
3 BAR Vac to 30 PSI 74777