MSD 8762 Installation

MSD Boost Timing Master

PN 8762

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IMPORTANT: Read the instructions before attempting installation.

Parts Included:

1 – Boost Timing Master, PN 8762 4 – Self Tapping Screws
1 – Control Knob 1 – 2-Pin Connector
1 – Parts Bag

WARNING: During installation disconnect the battery cables. When disconnecting the battery,

always remove negative cable first and install it last.

Note: The PN 8762 must be used with an MSD Ignition Control.

INTRODUCTION

In order to get the most out of your Boost Timing Master, driving tests and fine-tuning are required.
You will want to achieve having the highest advance timing for peak horsepower at low rpm when
boost pressure is low, and retard the timing during boost just enough to prevent knocking or
predetonation.

Note: In setting up the timing curve, a hand held Mighty-Vac or similar tool will allow you to simulate

the boost pressure, while you adjust timing at idle.

PROGRAMMING

Cylinder Select: The Boost Timing Master is programmed
at the factory for 8-cylinder engines. It can easily be
modified for use on 4 and 6-cylinder engines. The
number of cylinders is adjusted by cutting the cylinder
select loops. Figure 1 shows the Cylinder Programming
Loops and how to modify the Unit.

Magnetic Trigger: If you are using a distributor with a
magnetic pickup, such as an MSD, to trigger the ignition
system the White Wire Loop needs to be cut (Figure 1).
If you are using the points or amplifier input of the MSD
Ignition Control, this Loop does not need to be cut.

Figure 1 Selecting the Cylinders or Trigger Pickup.

MOUNTING

The Boost Timing Master can be mounted under the hood, but should be away from direct engine
heat sources. Make sure that the wiring reach their connections. Use the Control as a template to
mark the mounting holes. Remove the unit and drill the holes with an 1/8” drill bit. Use the supplied
screws to mount the unit.

M S D   •   W W W . M S D P E R F O R M A N C E . C O M   •   ( 91 5 )   8 5 7 - 5 2 0 0   •   F A X   ( 9 1 5 )   8 5 7 - 3 3 4 4

2 INSTALLATION INSTRUCTIONS

Control Knob

Find a suitable location on the
dashboard that can easily be
reached by the driver. Drill a
7/16” hole in the firewall, install

Figure 2 Connecting the Control Knob Harness.

the supplied snap bushing and route the harness wires through. Make sure the harness reaches
the connector on the BTM before mounting the control knob. Install the supplied 2-pin Weather-tight
connector (Figure 2) on the harness and connect it to the Grey/Black wire on the BTM. The order of
the wires inside the connector is not important.

Boost Line

Connect one end of an 1/8” ID vacuum line to the brass spigot on the BTM. Connect the other end of
the hose to a ported source such as the intake manifold or below the throttle blades of the carburetor
or throttle body. If you already have a boost gauge you can tee into that line.

WIRING

WIRE CONNECTION
Red: Connects to switched 12 volts.
Black: Connects to Ground.
Yellow: Connects to the MSD Ignition’s White Wire.
White: Connects to points or amplifier trigger wire on the engine.
Green/Violet Connects to the magnetic pickup of the distributor or crank trigger.
2-Pin Connector: Green is negative, Violet is positive.
Note: When using this connector, the white wire loop must be cut.

Note: The White wire and 2-Pin Magnetic Pickup wires will never be used at the same time!

ADJUSTING THE BOOST

The PN 8762 allows you to set the amount of ignition retard
as well as when the retard begins, both in relation to the
amount of boost being produced (Figure 3).

Dash Control Knob: This controls the slope of the retard.
That is, how much timing is removed per pound of boost.
The settings are 0° – 3° of retard per pound of boost with
a maximum of 15° of retard.

Figure 3 Setting the Timing Adjustments.

Start Point: This is where you adjust the beginning of the
boost retard curve. You can adjust the start point of the slope from 0 – 5 pounds of boost. A typical
setting is 2 psi for most users. Figure 3 illustrates this adjustment.

M S D   •   W W W . M S D P E R F O R M A N C E . C O M   •   ( 9 1 5 )   8 5 7 - 5 2 0 0   •   F A X   ( 9 1 5 )   8 5 7 - 3 3 4 4