MSD 7530T Programmable Digital-7 Ignition Control Installation - Manual (Page 8)

8 INSTALLATION INSTRUCTIONS
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GEAR SELECT
The Three Step Retard wires, Pink (1), Violet (2) and Tan (3) can also be wired to indicate the first
three gear changes to the ignition control. When selected from the Step Wire menu, the ignition will
know that the car is in second gear when 12 volts are applied to the Pink wire, third for the Violet
and fourth when the Tan wire is applied to 12 volts. By using this feature, if you lift off the throttle and
get back on it, the ignition will not count it as a gear change.
Note: When selected, this feature overrides the RPM Drop Gear Select values.
This is a sequenced series meaning Tan (3) will not become active until it sees 12 volts on Pink (1),
and Violet (2). This way, 12 volts do not need to be removed from each wire before the following
gear is selected.
Note: Five and six speed transmissions will have to use the RPM Drop functions.
GEAR RETARDS
This program provides the ability to create a run curve for each gear. Up to six different curves can
be programmed from 800 – 12,500 rpm in 0.1° increments for every 100 rpm. You can program up
to 32 different points on each Gear Map. Also, all of these points are interpolated every millisecond
to create a smooth (no steps) curve.
The number of gears is adjustable under the SHIFT menu, as well as the amount of rpm drop the
ignition needs to see before knowing that a different gear has been selected. Up to six gears can
be programmed. You can also use the Step Retard wires as Gear Select Indicators for the first four
gears.
These retards are mapped out on the Gear Retard chart of the Graph View. In the chart, go to the
View pull down menu and select Trace Box. That will give you a small window to show the different
color gear traces so creating a different curve for each gear is easier.
If you want the same retard curve for all gears, compose the curve, select the Edit pull down menu
and copy the curve, then select Paste All.
ADVANCE
This is a Gear Shift Advance feature that is designed to advance the timing (or remove any retards)
during a shift to keep the combustion chamber temperatures consistent.
Gear: Select the number of gears.
DRpm: Program the rpm drop that indicates a gear change from 200-1,500 rpm.
Deg: The amount of timing that is advanced. This is determined by how much retard is active.
You cannot program more advance than the current amount of retard.
Sec: The amount of time that the advance is active. Adjustable in .01 second increments
from 0-1.5 seconds.
Note: The Step Wire Gear Select program overrides the RPM Drop value for shifts.
CYLINDER COUNT
CylCnt: This is the number of cylinders of the engine. Programmable for 4, 6, 8 and Odd fire
6-cylinders (90°/150° only). Once a change has been made, turn the ignition Off and On to
reset.
Tach Trigger: There are two choices for the output of the tach terminal on the end panel of
the ignition. The output is a 30° duration 12 volt signal that is compatible with most tachs and
data acquisition systems. The default is Trigger which provides the most accurate signal for
rpm sensing components. The Timing program should only be used when spark timing data
is required by an acquisition control or to fire another ignition.