MSD 2960 Installation
Atomic LS7 EFI Master Kit
DANGER
PN 2960
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Thank you for selecting the Atomic LS EFI System! MSD’s Atomic EFI systems are designed with two
major goals; to simplify installation of EFI and deliver better overall performance from your engine.
Simplicity is achieved through wired-less technology to ease installation plus the Atomic is simple
to program with no PC required! Performance is delivered through advanced control of the fuel and
ignition, just as you’d expect from MSD.
Parts Included:
2 - Fuel Rail Assemblies
1 - Power Module
1 - Handheld Monitor
1 - Wideband O2 Sensor
1 - Weld - in O2 Sensor Bung,
Plug, and Crush Washer
1 - CAN Cable
1 - 4x Cam Sensor Harness
1 - 58x Crank Sensor Harness
2 - MAP Sensor Harnesses
4 - Injector Harnesses
1 - IAT Sensor and Grommet
1 - 4GB Micro SD Card
1 - TPS Sensor Harness
4 - Grommets, Sleeves, and
Mounting Screws
4 - Fuel Rail Brackets
8 - Injector Retainer Clips
1 - Spacer
1 - Shim Kit
8 - 6mm x 12mm Screws
8 - 8/32” Socket Head Cap
Screws
4 - M6 x 100mm Intake Bolts
4 - 6mm x 16mm Hex Head
Bolts
4 - #12 Washers
2 - 90º -6AN Fittings
1 - 15” High Pressure Fuel Hose
Parts Required, Not Included:
Fuel System: Fuel Pump, Fuel
Filter, Injectors, Injector
O-Rings,
Regulator, and Fuel Line.
Thread sealer for intake bolts.
Not legal for use on pollution controlled vehicles: The MSD Atomic EFI system is not CARB
approved for use on emission controlled vehicles.
modifications must be carried out by a qualified automotive technician. Installation of fuel system
parts requires handling of gasoline. Ensure that work is performed in a well ventilated area with an
approved fire extinguisher nearby. Extinguish all open flames, prohibit smoking and eliminate all
sources of ignition in the area of the vehicle before beginning the installation. When working with
fuel systems, eye goggles and other safety apparel should be worn to protect against debris and
sprayed gasoline. The finished work must be thoroughly checked to ensure there are no fuel leaks.
MSD • WWW.ATOMICEFI.COM • (915) 855-7123 • FAX (915) 857-3344
WARNING
Installation of this product requires detailed knowledge of automotive systems
and repair procedures. Installation of fuel system parts and any fuel tank
2 INSTALLATION INSTRUCTIONS
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CAPABILITIES
The Atomic LS7 kit is designed to fit the original equipment intakes. The Atomic LS7 kit is a self
integrated Fuel and Ignition controller for 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 off of its 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 LS7 kit uses all OE sensors with the exception of the wideband O2 sensor and the Intake
Air Temperature sensor (IAT) supplied with the kit. The Atomic LS7 system only supports a cable
driven throttle body at this time.
Note: The drive-by-wire 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 LS7 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 LS7 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 table
and ignition in order to maintain a properly running engine.
Power
Module
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
Handheld
Programmer
the same diameter as the -8AN).
MSD • WWW.MSDPERFORMANCE.COM • (915) 855-7123 • FAX (915) 857-3344
Drivers Side Fuel Rail Passenger Side Fuel Rail
INSTALLATION INSTRUCTIONS 3
COVER
COVER
FUEL RAILFUEL RAIL
LIFT THIS SIDE OF
COVER ENOUGH TO
CLEAR FUEL RAIL
PUSH COVER
Figure 1
PREPARING THE FUEL RAILS FOR INSTALLATION
1. Lift the rounded end of the rail cover off of the fuel
rail (Figure 1).
2. Lubricate the o-rings on the injectors with some
motor oil or silicone lubricant. Install the injector
retainer clips onto the injectors. The injector clips
will automatically secure the injector to the fuel rail
when they are inserted into the bung (Figure 2).
3. Install the clips onto the injector before they are
pushed into the fuel rail bung. The injector clip will
automatically secure the injector to the rail.
4. Lubricate the o-rings on the injectors with some
motor oil or silicone lubricant and push the fuel
injectors into the bung without forcing them on. The
injectors should slide in easily. Use the injector clips
to lock the injectors onto the fuel rails (Figure 2).
WARNING: Forcing the injectors into the bung can
damage the o-rings, which can cause an engine fire.
5. Plug the fuel injector pigtails into the fuel rail
connections (Figure 3).
6. Connect the fuel injector pigtails to the injectors. The
long wires connect to the injectors on each end of
the fuel rail. The short wires connect to two inner
injectors (Figure 4).
COVER
FUEL RAILFUEL RAIL
DISENGAGE
FROM FUEL
RAIL
LIFT COVER UP
FUEL RAILFUEL RAIL
Figure 2
Figure 3
Figure 4
MSD • WWW.ATOMICEFI.COM • (915) 855-7123 • FAX (915) 857-3344
4 INSTALLATION INSTRUCTIONS
7. Plug the FPS connector into the fuel pressure sensor under
the fuel rail (Figure 5).
8. Connect the CAN cable from one rail to the other (Figure
6).
9. Connect the heavy red Rail Power wires together between
the two rails (Figure 7).
FUEL RAIL INSTALLATION
1. Preassemble the rail brackets with a washer and the M6 x
100MM bolts on the angled end. Use a single 6mm x 16mm
hex head bolt on the closed end of the flange. Coat the ends
of the 100mm bolts with thread sealant (Figure 8).
2. Place the spacer/bushing/rail bracket assemblies onto the
intake manifold. The angled end of the bracket is always
facing to the left when installed correctly on either side of
the engine. The rear passenger bracket will require a spacer
between the intake manifold and the bracket (Figure 9)
Figure 5
Figure 6
Figure 7
Figure 8
SPACER
Figure 9
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INSTALLATION INSTRUCTIONS 5
FRONT
1ST PASS: 42 IN LB - 44 IN LB
2ND PASS: 87 IN LB - 89 IN LB
3. Use the provided torque sequence to torque the
manifold bolts down correctly. Bolts #9 and #10 will
use the stock length bolts/bushings (Figure 10).
4. Check the rail brackets for alignment with a straight
edge (Figure 11).
5. Check the rail brackets for the correct installation
height with a feeler gauge. If there is more than
.015” of clearance, use a shim from the shim kit to
correct (Figure 12).
6. Install the rails onto the manifold. Use the supplied
6mm bolts to secure the rails to the rail brackets.
Torque to 85 in lb – 87 in. lb.
STOP HERE
Figure 10
Figure 11
.015"
Figure 12
MSD • WWW.ATOMICEFI.COM • (915) 855-7123 • FAX (915) 857-3344
6 INSTALLATION INSTRUCTIONS
7. STOP. Visually inspect and ensure all the injectors are
sitting evenly and the injector o-rings are not pinched
or visible. Failure to install the injectors correctly can
result in an engine fire.
8. Begin routing the sensor harnesses and plugging
them into the appropriate sensors.
9. Snap the rail covers in place and secure them onto
the fuel rails with the supplied 8/32” socket head cap
screws (Figure 13).
10. Secure the front cover onto the fuel rail with the
supplied 8/32” socket head cap screws. Install the
back rail cover plate onto the assembly and secure it
with the supplied socket head cap screws.
Figure 13
FUEL RAIL/ECU WIRING
The Atomic LS7 kit has several harnesses to install with the different variations of the OE sensors.
These adapter harnesses plug into the connectors found on the rails themselves. The IAC and TPS
connectors are on both rails to accommodate the different throttle body configurations.
Air Conditioning kick up (AC): When 12v is applied to the AC kick up wire, the ECU will kick up the
and ground the red Fan 1 wire to compensate for the engine load change created by the AC
compressor.
Alternator: The kit plugs directly into the factory GM alternator.
Cam Sensor: The kit supports the 4x cam sensors. The easiest way to identify the cam sensor on
a stock engine would be by locating the sensor on the motor. The 4x sensor is mounted on
the timing chain cover.
Controller area network (CAN): The kit utilizes a CAN communication for wiring between the fuel
rails/ECU and the Power module.
Crank sensor: The kit supports the 58x crankshaft trigger wheels.
Engine Coolant Temperature (ECT) sensor: The engine coolant temperature is monitored by the
ECU for fuel and ignition adjustments in closed loop operation.
Fuel Pressure (FP) Sensor: The kit includes a fuel pressure sensor which is already installed on the
driver side fuel rail.
Idle Air Control (IAC) Sensor: The kit has a connector on each rail to accommodate different intake
styles. IAC must be plugged into the driver side connector.
Ignition Coils: The kit has a factory connector that will connect to the factory coil bracket harness
on each valve cover (not supplied with the kit). There is an extra ground wire with each coil
bracket connector that should be grounded to the back of each cylinder head.
Injectors: The kit supports the factory EV6 style injectors (Figure 14).
Intake Air Temperature (IAT) sensor: The sensor is supplied in the parts bag.
It is recommended to install the sensor in the intake air track before the
throttle body. A ¾” hole is required for the sensor.
Map sensor: The kit supports the original equipment (OE) MAP sensors.
Oil Pressure (Oil) sensor: The kit utilizes the factory oil pressure sensor. There
are different style sensors, but the connector is the same between these
sensors.
Power: The heavy gauge wire supplies 12v to both fuel rails from the power
module.
Figure 14
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INSTALLATION INSTRUCTIONS 7
Throttle Position (TPS) Sensor: The kit has a connector on each rail for the TPS sensor. It must be
plugged into the driver side rail. The kit only supports a cable driven throttle body at this time
and includes an adapter harness for the TPS sensor used on a cable driven throttle body.
Wide Band O2 Sensor: A wide band O2 sensor is supplied with the kit. The O2 sensor is used by
the ECU to monitor air/fuel ratios (AFR) in the exhaust gases. Adjustments are made by the
ECU in closed loop to maintain (AFR).
MSD • WWW.ATOMICEFI.COM • (915) 855-7123 • FAX (915) 857-3344
8 INSTALLATION INSTRUCTIONS
*INJECTORS ADAPTERS
ARE INTERCHANGEABLE.
(EV6 Adapters shown)
NOTE: Do not cross the
injector harnesses when
installing them on the
injectors.
PASSENGER
MODULE
POWER
TO
ETC/
A. Brown
B. Pink
C. Brn/White - Gnd
D. Not Used
V V T
D. Black - Coil 2B
E. Green - TPS1
F. Orange - 5V
G. Violet - TPS2
H. Not Used
(NOT USED
ON LS7)
D LPHI
D LPHI
IAT
IAC2
A. Black - Ground
B. Violet - Signal
A. Orange - Coil 1B
B. Gray - Coil 1A
C. Blue - Coil 2A
CURRENTLY
USED)
(NOT
Orange - AC
INJ2*
1. Signal
2. 12V
INJ4*
1. Signal
2. 12V
MAP
2, 4, 6, 8
A. Orange - 5V
B. Lt Green - Signal
C. Brown - Ground
E. Brown - Ref Gnd
F. White - Coil 6
G. Lt. Blue - Coil 8
H. Pink - 12V
SIDE
FGH
COILS
A. Black - Ground
B. Tan - Coil 2
C. Lt. Green - Coil 4
D. Not Used
Black - GROUND
INJ6*
1. Signal
2. 12V
INJ8*
1. Signal
2. 12V
CRANK
A. Pink - 12V
B. Orange - 5 V
C. Brown - Ground
D. Org/Yel - Signal
Red - POWER Red - POWER
Red - POWER
CAN
A. Brown
B. Pink
C. Brn/White - Gnd
D. Not Used
E. Green - TPS1
F. Orange - 5V
G. Violet - TPS2
H. Not Used
1. Orange - 5V
2. Black - Ground
3. Blue - Signal
TPS ADAPTER
B. Gray - Coil 1A
C. Blue - Coil 2A
D. Black - Coil 2B
ETC/TPS
IAC
C. Not Used
D. Not Used
A. Orange - Coil 1B
A. Black - Ground
B. Yellow - Signal
ECT
A. Not Used
B. Brown - L Term
ALT
1. Signal
2. 12V
INJ1*
1. Signal
2. 12V
INJ3*
F. Green - Coil 3
G. Tan - Coil 1
H. Pink - 12V
A. Pink - 12V
B. Orange - 5V
C. Brown - Ground
D. Brn/Wht - Signal
GROUND
CAM
Black
A. Black - Ground
B. Blue - Coil 7
C. Brn/White - Coil 5
D. Not Used
E. Brown - Ref Ground
1. Black - Ground
2. Orange - 5V
3. Lt Blue - Signal
1, 3, 5, 7
COILS
H
F
G
DRIVER
SIDE
FPS
1. Signal
2. 12V
INJ5*
1. Signal
2. 12V
INJ7*
1. Black - Ground
2. Orange - 5V
3. White - Signal
OIL
2. Yellow - CAN HI
3. Blk/Red - Gnd
4. Black - Gnd
5. Orange - Crank
6. Brown - Cam
7. Blue - Tsync
8. Gray - Shield
CAN
1. Green - CAN LO
Figure 15 Wiring
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