MSD 7761 Advance RPM Control Module Installation - Manual (Page 5)

INSTALLATION INSTRUCTIONS 5
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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
Crank Slew Limiter - Use this setting to turn slew rate control ON or OFF.
Launch Delay Time - Preset the amount of time after the Dark Blue launch wire is released. In that
time no corrections will be made for high slew rate.
Timing Margin - The excess rpm allowance for fluctuations (“wobble”) in the engine’s speed.
This is necessary because of the variance seen in RPM signal. This margin
sets the minimum amount of RPM climb required to activate the timing control
features.
Rev Limit Margin - The excess rpm allowance for fluctuations (“wobble”) in the engine’s speed.
This is necessary because of the variance seen in RPM signal. This margin
sets the minimum amount of RPM climb required to activate the rev limit
features. This margin always acts in addition to Timing Margin.
Slew Retard - The retard amount activated while the Engine RPM exceeds the set Slew Rate
plus the Timing Margin.
Gear 1 - The maximum slew rate the system allows for each gear. The number of gears
that appear on the screen should match the number of gears programmed
into the 7730.
TIME BASED
The settings here work in the same way of those for the Driveshaft settings. Unlike the driveshaft
settings, the crank shaft settings allow only a single Retard Curve.
RETARD ABOVE LIMIT
The settings in this sub tab determine the amount of timing retard based on time from launch. A slope
can be set if an engine requires less timing retard further into a run. Multiple steps can be plotted to
coordinate with gear changes or nitrous events. The settings here vary depending on the application.
Only a single Retard Curve can be set based on Crank Shaft RPM.
CURVES
The Retard Curve or limiter Curve (AKA Dots) will be set to follow the crankshaft rpm curve closely.
When crankshaft rpm exceeds the Rev Limiter Curve the ARC module will limit the engine. If a retard
curve is used the timing will retarded accordingly. Each curve set can be programmed with up to 30
points in intervals of 0.01 seconds and 1 rpm. See “Loading Curves” below for instructions to import
a driveshaft curve into this plot.
FEATURES
There are a number of features of the software for the ARC module that do not have individual tabs.
LOADING RPM CURVES
In order to draw the best possible control curves for the ARC, users should import an RPM curve
from data recordings to use as a base. To load an RPM curve into this plot, a user must have a .csv
file from a previously recorded run. MSD View will accept up to 10 seconds worth of rpm data that
automatically loads from the 0 time point. If a run has data recorded prior to the launch, adjust the 0
time point with the Time Offset feature in ReView prior to transferring the run back into the View software.