MSD 62152 DIS-4 Plus Distributorless 4 Channel Installation - Manual (Page 9)

INSTALLATION INSTRUCTIONS 9
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• 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
Figure 6 Wiring the Step Retard.
Figure 7 Wiring the Two Step.
STEP RETARD
A retard can be activated by supplying 12 volts to the Pink wire (Figure 6). This is ideal for nitrous
applications or for a high speed retard. The amount of retard is set through the two rotary switches and
the total amount of retard is 30°. When the Mode Switch is in positions 4-7, there will be a one second
delay after 12 volts are removed from the Pink wire. In positions 0-3 the deactivation is instant.
RPM LIMITS
There are two adjustable Rev Limits, a Max Limit and a 2-Step. The Max Limit will protect your engine
in the event of driveline failure or missed shifts. This Max Limit DOES NOT override the limit set by
the factory ECU.
The 2-Step allows you to activate a lower rpm limit that is generally used on the starting line. When
12 volts are supplied to the Blue wire, the 2-Step is activated (Figure 7). When 12 volts are removed,
the Max Limit is active.
Both limits are adjusted with one dial in 1,000 rpm increments and one dial in 100 rpm increments.
When the Mode Switch is set in the 2, 3, 6 or 7 position, another 4,000 rpm will be added to the Max
rev limit value.
NOTE: The minimum rev limit is 2,000 rpm, even if lower numbers are selected.