MSD 2957 Atomic LS Master Early Truck Kit (GEN III 1999-2007) Installation - Manual (Page 2)

2 INSTALLATION INSTRUCTIONS
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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 5 - 7 1 2 3 • F A X ( 9 1 5 ) 8 5 7 - 3 3 4 4
CAPABILITIES
The Atomic LS Truck kit is designed to fit the original equipment (OE) 3-bolt and 4-bolt throttle body
truck intakes. The Atomic LS Truck is a self integrated Fuel and Ignition controller for GEN-III and
GEN-IV motors that requires no programming with a PC. The interface is controlled through a supplied
hand held controller. The ECU only needs basic configuration information. Once the engine warms
up to operating temperature, the ECU tunes itself using a basic configuration to ensure the best
performance and throttle response for your engine. The atomic will adjust timing and fuel curves on
the fly which in turn produces the smoothest idle, best fuel economy, and superior wide open throttle
performance at all times. This also means that weather and altitude changes aren’t a problem with this
system. The Atomic LS Truck kit supports the factory Variable Valve Timing (VVT) configuration as well.
The Atomic LS Truck kit uses all OE sensors with the exception of the wideband O2 sensor. The
Atomic LS Truck system only supports a cable driven throttle body at this time.
Note: The 4-bolt electronic control throttle body will have to be converted to a cable drive throttle
body like the MSD PN 2940.
COMPONENTS
Power Module: The Power Module of the Atomic LS is the communication
hub of the system and provides the high current fuel pump circuit
and other input/outputs for optional features. The unit has two
ports for the MSD CAN system as well as a wiring harness. There
are connections for the WB02, the Handheld Monitor as well as
Rail Power and CAN communication to the integrated fuel rails.
Handheld Programmer: The Atomic LS Truck kit is a self-tuning fuel and
ignition control system. The system only needs the basic engine
configuration information to build a fuel table for the engine. The
Handheld Programmer is used to enter all the engine parameters
into the ECU, and uses the MSD CAN to communicate with the
ECU. Once the engine has been started and warmed up to operating
temperature, the ECU will monitor the sensors. The ECU will then adjust
the fuel tables and ignition in order to maintain a properly running engine.
Fuel Rails/ECU: The Fuel Rails/ECU is combination of the electronics that drive
an ECU and a fuel rail assembly built into one unit. All of the engine sensor
connectors (except for the wideband O2 which connects to the Power
Module directly) are found on the fuel rails. The fuel rails are equipped
with -6AN fittings, but will accept -8AN fittings (the internal rail orifice is
the same diameter as the -8AN).
Handheld
Programmer
Power
Module
Drivers Side Fuel Rail Passenger Side Fuel Rail
E F G
F G H
D LPHI D LPHI
E F G
F G H
D LPHI D LPHI