Technical information

AUTOTRONIC CONTROLS CORPORATION • 1490 HENRY BRENNAN, EL PASO, TEXAS 79936 • [phone] • FAX [phone]
www.msdignition.com email: [e-mail]
92
The Boost Timing Masters are designed to be used with an MSD Ignition Control. They allow you to retard the
timing in relation to boost pressure created by a turbo or supercharger. Timing adjustments can be made by the
driver with a dash mounted control knob. The timing can be retarded up to a maximum of 20°.
Part Number 8962 is a BTM with an additional vacuum advance feature. When vacuum is present, you can adjust
up to 20° of timing advance. This adjustment is made with a locking potentiometer on the side of the unit.
Both BTM’s must be used with an MSD Ignition Control and can be used on 4, 6 or 8-cylinder engines, see page 91.
BOOST TIMING MASTER FOR MSD
IGNITIONS, PN 8762
WITH VACUUM ADVANCE , PN 8962
General Wiring
Trigger Wires
Red:
Black:
Yellow:
Connects to switched 12 volt source.
Connects to ground.
This is the trigger output to the Ignition. It will connect to the MSD’s White wire or Points terminal.
White:
Violet and Green:
Connects to points or an ignition amplifier output. When this wire is used the Magnetic
Pickup is not (Violet and Green).
These wires are routed together in one harness and form the magnetic pickup connector.
This connector plugs directly into an MSD Distributor or Crank Trigger. The Violet wire is
positive (+) and the Green wire is negative (-). When this connector is used, the White wire
is not and should be sealed.
Control Knob: The control knob wiring is routed through a 2-Pin Weathertight Connector. It does not matter which
color wire is connected to which. The control knob shows 1°, 2° and 3° increments. The ignition timing will be
retarded 1°, 2° or 3° per pound of boost with a maximum of 15°. (With the knob set at 2°, at 6-lbs of boost there will
be 12° of retard.) When the control knob is at full counterclockwise position, there will be no retard.
HEAVY RED
TACH
OUTPUT
FROM
IGNITION KEY
(ORIGINAL COIL WIRE)
IGNITION KEY
RED
TO 12V
HEAVY BLACK
OR
GREEN
VIOLET
DISTRIBUTOR
WITH
MAGNETIC PICKUP
MSD CRANK
TRIGGER WHEEL
DISTRIBUTOR
+
+
TO BATTERY
TO BATTERY
+
Multiple
Spark
Discharge
PART NO.
AUTOTRONIC CONTROLS CORPORATION
SERIAL NO..
IGNITION
®
BLACK
WHITE
WHITE
RED
YELLOW
WHITE
NOT USED
TO GROUND
PN 8762
PN 8860
ORANGE
BLACK
AUTOTRONIC CONTROLS CORPORATION
1490 HENRY BRENNAN DR.,TX 79936 [phone]
IGNITION
TM
BOOST
MASTER
TIMING
PART NO. 8762
BOOST
RETARD
0
1
2
3