MSD 7730 Power Grid System - Controller Only Installation - Manual (Page 8)

8 INSTALLATION INSTRUCTIONS
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Delay: This is the time, in seconds, that will pass prior to initiating the timing change after the proper gear
change. This setting defaults to 0.0 but can be taken up to 5.0 seconds. If a timing change is desired
during an entire run, but not other times the engine is running, this setting should be entered as
0.1 sec.
Ramp Time: The amount of time it takes for the Individual Cylinder Timing to be fully engaged. During this
time the controller will ramp the timing change from the starting point to full timing.
Note: Changes made in Individual Cylinder Timing are cumulative. If a cylinder’s timing is to be altered for
a duration of time two rules must be made, one to initiate the change and another to reverse the
change at the appropriate time.
LAUNCH RETARD (TIMING BY TIME)
This function allows a user to set an engine timing curve based on the run time from launch (release of
the dark blue wire). It can be programmed from 0° to 20° in 0.1° increments. Up to 30 trace points can be
set per 0.01 sec. across the available 10 seconds. When the Launch wire is active, the retard value is the
placement of the first dot. When 12 volts are removed from the Dark Blue wire the engine timing will follow
the prescribed curve added to the base timing set at the engine RPM map.
STEP RETARDS
There are five step wires that control each of the corresponding step retards. These retards can be set so
that they are not active until a specified rpm is reached even if the wire receives voltage. Using this system
a step can activate as soon as the trigger wire receives 12 volts or after the engine reaches a specific rpm
with 12 volts at the trigger wire. Once the retard is activated, timing can be changed in a single step or be
ramped in over a period of time. The retard can also be turned off in a single step or ramp after a prescribed
time after power is removed.
Step Retard Activation Wires
Step 1 Step 2 Step 3 Step 4 Step 5
Pink Violet Tan Light Green Green
Note: These wires can also be used as Gear Select Indicators. See page 5.
Note: The Step-5 wire may be used as a Spool Rev Limiter. When using this wire for a retard and not a
Spool Rev Limiter, the rev limit setting must be set above the max rev setting.
Activation through Wiring: Each step is activated by applying 12 volts to the corresponding wire. When
multiple step retards are enabled at the same time the retard amounts are added together. The
maximum retard allowed by the system is a total of 30° (including other retard amounts from a
launch, boost, gear retard, etc).
Activation through RPM: Each step retard can also be activated through rpm. In order to achieve this,
12 volts must still be applied to the corresponding step retard, and an rpm must be entered in the
respective step retard control. When 12 volts is applied, the retard will not activate until the rpm
value is reached. Note that the retard will remain active until the rpm drops back below the set
value. The step retard is added to all other retards in the system, including other active steps until
it is deactivated.
Each of the five step retards has its own tab under the Ignition Timing – Step Retard tab. Within the individual
tabs there are controls for the step retard.
Timing Retard: This is the amount of timing that will be retarded while this step is active. The timing can
be adjusted in 0.01° increments.
Engine RPM: When this setting is used the engine must be above the prescribed RPM before the step
retard will be activated.
On Ramp: The amount of time it takes for the step retard to retard the full amount. During this time the
controller will ramp the timing retard from the starting point to full step retard.