Dis 8 – Mallory Ignition ACCEL DIS 8 75610 User 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
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