MSD 7730 Power Grid System - Controller Only Installation - Manual (Page 9)

INSTALLATION INSTRUCTIONS 9
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Off Delay: This feature will set a time based delay to deactivate the step retards. The Off Delay is designed
to keep the timing retarded after the wire is deactivated. This setting defaults to 0.0 sec but can be
taken up to 5.0 sec by the user.
Off Ramp: The amount of time the system takes to turn the step retard off once power is removed from the
step wire and any delay is complete. During this time the controller will ramp the step retard out.
Note: If you prefer to activate the step retards through the activation wires alone without considering rpm
the setting for rpm should be left at the default of 0.
SHIFT RETARD
Using MSD View, a retard can be implemented momentarily to help maintain traction immediately after a
shift. To do this, simply enter the amount of timing retard desired and the length of time the retard should
be active for each shift. Whether using an rpm drop or a step retard activation wire for a trigger, as soon as
the system detects a shift it will retard the timing for the prescribed amount of time.
REV LIMITER
A variety of different rev limits can be programmed per individual vehicle needs. The actual rev limiter will
never exceed the maximum rev limiter.
Burnout Rev Limiter: This limit is activated when 12 volts are applied to the Light Blue wire. It is adjustable
from 1,000 to 15,000 rpm. Note that the Slew Rev Limiter is disabled by the Burnout Limit.
Launch Rev Limit: This limit is activated when 12 volts are applied to the Dark Blue wire. It is adjustable
from 1,000 to 15,000 rpm.
Latching: When this setting is enabled engine rpm must be below 7/8 of the launch limit setting while 12
volts is applied to the Dark Blue wire to engage the Launch Limiter. This allows clutch cars to wire
the Dark Blue wire directly to the clutch switch without the need to use a relay. If Latching is disabled,
the Launch Rev Limiter will be engaged anytime the Dark Blue wire receives 12 volts (such as during
each shift) regardless of engine rpm.
Maximum Rev Limiter: This is the overrev limit to help protect the engine from damage.
Spool/Step 5 Rev Limiter: This program gives turbo cars a fourth rev limit to help the engine spool the
turbo prior to the launch. It is active when 12 volts is applied to both the Light and Dark Blue wires
at the same time or when using the Step 5 retard wire. (The Step 5 wire can allow for activating the
Spool rev Limiter without activating the line-lock.) It is adjustable in 50 rpm increments from 1,000
to 15,000. Default is 12,000 rpm.
Safety Run Time Rev Limiter: Using two settings a safety limiter can be activated in case of incident. If for
any reason the engine is still revving after the set amount of time since the launch limiter is released,
this feature will lower the rev limit to a user specified rpm over 2 seconds. This will help anytime
the throttle is open much longer than it should be, such as a stuck throttle linkage or an accident.
Users have two options to activate the Safety Run Time countdown; the Launch limiter, or the Safety
RPM Start. In either case the Dark Blue wire must be activated so that time down can start upon
its release. Many users will activate the Safety countdown by bringing the engine up on the limiter.
Users who do not wish to use the launch rev limiter can activate the safety run time countdown by
taking the engine rpm equal or higher than the Safety RPM Start setting. This setting act only as a
countdown activator and has no rev limiting ability.
DATA ACQUISITION
The data recorder on the Power Grid System Controller comes with a 2GB micro SD card which will easily
hold more than an entire event’s worth of data. Within the settings for data acquisition on the system
controller there are four tabs that provide options for when and what data is recorded. If a new micro-SD
card is needed or wanted for any reason it is important to get a Class 6 or higher at the minimum, NOT all
micro-SD cards will work. If there is question as to whether an SD card will work test recording should be
done prior to a run.
The Power Grid System Controller will also easily send the data it records to compatible Racepak data
acquisition systems. To connect the two systems simply plug the included VNet connector into an available