60143 Datasheet, PDF (8/12 Pages) Mallory performance club – MSD LS Ignition Control

8
INSTALLATION INSTRUCTIONS
Figure 5 Timing Tables LS1
HO Tables: These tabs are similar to the regular tables, but have 4-5 more degrees of timing
added in the wide open throttle areas. These should only be used while using high octane
fuel (91-93 Octane).
Note: The timing output from the selected table will be modified by the “TEMPERATURE” correction
as well as the “INDIVIDUAL CYLINDER” timing. The sum of all these values is the final timing
to the engine.
INDIVIDUAL CYLINDER
These tables control individual cylinder timing. Each CYL # is the actual cylinder number of the en-
gine. Positive values advance the timing and negative values retard the timing. The axes are load
and RPM and are shared with the main custom timing tables (Custom 1-4). If the axis values are
changed in these tables, they will also change in the custom timing tables.
TEMPERATURE
Running an engine coolant temp sensor is not required, but recommended for optimum operation
and engine protection. When the coolant temperature is high, the engine can generally not with-
stand quite as much timing as when the temperature is low. The default graph is a little more ag-
gressive than in an OEM application, but should work well. If the sensor is not installed or is faulted
(shorted or open) the temperature in the graph will default to 50C (122F) so the numbers surrounding
50C should be left at 0.
Note: The Timing vs Temperature table values are based on the use of the stock LS GM coolant
temp sensor. Do not use a different sensor unless you know the calibration is the same.
STEP RETARD (PINK WIRE)
The “Step Retard” (nitrous) input, will retard the ignition timing when it is activated with +12V power.
It is helpful if you are using a power adder and need to retard the timing while it is active. The fol-
lowing describes how the activation/deactivation works:
TOTAL RETARD: The maximum amount of timing that will be removed after the “ON Ramp
Time” has been passed.
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