MSD 2950 Installation

Atomic LS EFI

DANGER

Master Kit LS2/LS3, PN 2950

ONLINE PRODUCT REGISTRATION: Register your MSD product online. Registering your product will help if there is ever a warranty issue with your product and helps the MSD R&D team create new products that you ask for! Go to www.msdperformance.com/registration.

Thank you for selecting the Atomic LS EFI System! MSD’s Atomic EFI systems are designed with two major goals; to simplify 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 – Integrated Fuel/ECU Rail Assemblies 1 - Power Module 1 - Handheld Monitor 1 - Wideband O2 Sensor, Bung and Plug 2 - MAP Sensor Adapter Harnesses 2 - Camshaft Sensor Harnesses, 1x and 4x 2 - Crankshaft Harnesses, 24x and 58x 4 - Injector Harnesses 1 - IAT Sensor and Grommet

Parts Required, Not Included:

• Injector O-Rings

• Fuel System: Fuel Pump, Regulator, Line

• LS1 and LS6 Installation Kit - PN 2955

For use with Master Kit PN 2950. Provides the

correct brackets and EV-1 injector connectors for the early car intake manifolds identiﬁed by a 3-bolt throttle body.

• Thread Sealer for Intake Bolts

Not legal for use on pollution controlled vehicles: The MSD Atomic LS EFI system is not CARB approved for use on emission controlled vehicles. This system is designed to control the EFI and ignition on LS based engines being retro-ﬁt into older vehicles that do not require emission controls.

1 - TPS Sensor Harness 2 - 90° -6 AN ﬁttings 4 - -6 AN ﬁttings 1 - 18" High Pressure Fuel Hose 4 - Installation Brackets 4 - Intake Manifold Bolts 8 - Injector Retainers 8 - 8/32" Socket Head Cap Screws 1 - 4G Micro SD Card

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

CAPABILITIES

The Atomic LS EFI system is designed to ﬁt OE intake manifolds, as well as some aftermarket intakes. The Atomic EFI is a self-tuning fuel system that continuously adjusts after the basic conﬁguration is complete. There is no laptop programming. Based on the engine descriptors you input, the Atomic will automatically create a base fuel map to get the engine running. Once running, the self learning system will optimize those maps resulting in the best performance possible. If you change altitude, outside temperature, or other factors the Atomic will adjust accordingly, on the ﬂy. This ensures that your engine will produce excellent driveability at all times, even if you drive from the sunny coast to the cold mountains.

The Atomic LS fuel injection system is capable of running the fuel and ignition system of most LS engines. The system incorporates OE style connectors to use with the factory sensors on the engine. The only external sensor required to add is the supplied Wide-Band Oxygen sensor.

There are four main components of the Atomic LS system; the driver’s side and passenger side integrated fuel rails, the Power Module and the Handheld Monitor. The ECU of the system is divided onto the fuel rail assemblies and communicate to each other, as well as the Power Module, through MSD’s proprietary CAN-Bus technology.

Crankshaft Trigger Wheel ID: It is important to know what crankshaft trigger wheel your engine is ﬁt with. There are two; early engines used a 24-tooth wheel and later model engines use a 58-tooth wheel. These can be identiﬁed by removing the crank sensor (located behind the starter) and looking inside the engine (see photo at the right).

Fuel/ECU Rails: The unique fuel rails of the Atomic LS EFI system also incorporate the ECU of the system. The two banks receive power from the Power Module and communicate to the system through MSD’s CAN-Bus network. To install the rails to the intake manifold, the covers will need to be

24x 58x

removed (which is outlined in the instructions).

Each bank has OEM connectors that plug into the injectors, coils and speciﬁc sensors of the engine. Each bank has a ground wire that must be connected to the

CONTROLLER

block. The fuel line inlets of the rail accept -6 AN and -8 AN ﬁttings and internally are equivalent to a -8 line (-6 AN ﬁttings are supplied.)

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

POWER MODULE

well as power and communication to the integrated fuel rails.

Programming: The Atomic EFI is a self-tuning fuel system that continuously adjusts after the basic conﬁguration is complete. There is no laptop programming. Based on the engine descriptors you input, the Atomic will automatically create a base fuel map to get the engine running. Once running, the self- learning system will continuously adjust those maps to obtain the desired air/fuel ratio. This feature ensures that your engine will have the right fuel mixture at all times, no matter where you are driving.

Intake Manifolds: The Atomic LS EFI system is designed to ﬁt most OE intake manifolds, as well as some aftermarket intakes. There are different mounting brackets available for several of the key intake manifolds. MSD offers two Installation Kits that are supplied with different injector connects and fuel rail brackets for manifolds such as the LS1 or truck. They are described in the ‘Not Included’ list of parts above.

Fuel System: The Atomic LS system can be used with return or returnless EFI system. Review the Fuel System Information section starting on page 3 for detailed information.

MSD • WWW.ATOMICEFI.COM • (915) 855-7123 • FAX (915) 857-3344

INSTALLATION INSTRUCTIONS 3

Wide-Band 02 Sensor: A Wide-Band 02 sensor is supplied in the Atomic LS Master Kit. This sensor is responsible for constantly monitoring the exhaust gases and relaying that information to the ECU where adjustments are constantly made to the fuel delivery in order to meet the air/fuel targets. Only one sensor is required. Page 5 outlines the sensor installation.

Crank Sensor: The LS engine platform has used two different crank position sensors through the years. There is a 24-tooth wheel or a 58-tooth wheel on the crankshaft. The sensor has always been located behind the starter. The 24-tooth sensor has a black connector whereas the 58-tooth sensor has a gray connector. The Master Kits are supplied with connectors for both the 24x and 58x trigger sensors.

Cam Sensor: The Cam Sensor of LS engines has changed throughout the years. Not only it’s location, but its wiring as well. Early models have the cam sensor located at the back of the block near the deck surface. During 2005, as a running change, the location changed to the front of the block between the cam and crankshaft. The Atomic LS system can function with both designs.

Throttle Body and Sensors: The Atomic LS requires a mechanically operated throttle body. In the future Throttle by Wire applications will be covered. The Atomic has all of the OE connections for the throttle body including Throttle Position (TPS) and Idle Air Control Solenoid (IAC).

Intake Air Temperature (IAT) Sensor: This sensor is supplied and it is recommended to install it in the air intake duct before the throttle body. A 3/4" hole is required for the sensor.

Rev Limiter: There are two settings for a rev limiter; one through fuel, one through ignition. There is an optional 2-Step Rev Limiter that can be used on the starting line for a low rpm limit. This is temporarily activated through the Dark Blue wire of the Power Module to produce consistent launch rpm.

Power Adders: The Atomic LS system can accept wet nitrous systems and boost through a turbo or supercharger. For nitrous, there is a program that allows you to set a target air/fuel ratio when the nitrous is activated as well as an selection to set a timing retard. For boosted applications there is a target air/fuel ratio setting for times of boost pressure. See the advanced settings on pages 15-16.

FUEL SYSTEM REQUIREMENTS

The Atomic LS fuel injection system requires a high pressure fuel pump system. The fuel system is not supplied due the large variety of applications incorporating the LS engine platform. Depending on your engine combination, the Atomic LS requires a minimum of 58-62 psi to operate. When selecting a pump, regulator and lines, be sure each component is designed to perform at high pressure. MSD offers fuel pumps, hose and accessories to complete your installation. Following are some guidelines in helping set up a fuel system for your Atomic as well as components available separately from MSD.

• The Atomic is capable of operating with a return or returnless style system. For best results with

either system, MSD strongly recommends an in-tank pump. Installing the fuel pump in the tank results in quieter operation, less chance of cavitation and a reduction in pump temperature.

• When running a returnless fuel system (Pulse Width Modulated) the fuel pump must be mounted

in the tank. It is recommended to use an MSD Atomic Fuel Pump, PN 2925 or PN 2926.

• MSD supplies -6 AN Push-Lock style ttings for the fuel rails. These ttings must be used with MSD's

high pressure EFI hose. Refer to page 9 for installation.

• If mounting the pump in the tank is not an option, install the pump as close as possible to the tank.

Within 2-feet of sending unit is recommended.

• Do not use hard line when plumbing the fuel system. When using a PWM fuel system, pulsations

and harmonics could cause unstable fuel pressure resulting in pump cavitation or poor engine performance.

MSD • WWW.ATOMICEFI.COM • (915) 855-7123 • FAX (915) 857-3344

4 INSTALLATION INSTRUCTIONS

, MOUNT

FUEL RAIL

(UNDER COVER)

-6 90° FITTING SUPPLIED

FUEL RAIL

(UNDER COVER)

NOTE: IF RUNNING A RETURNLESS FUEL SYSTEM, THE PUMP MUST BE MOUNTED IN THE TANK.

MSD ADJUSTABLE

REGULATOR

FUEL

FILTER

FUEL TANK

FUEL

PUMP

IT IS RECOMMENDED TO MOUNT THE FUEL PUMP IN THE TANK WHENEVER POSSIBLE. IF IT MUST BE MOUNTED EXTERNALLY THE PUMP WITHIN 2-FEET OF THE FUEL TANK SENDING UNIT.

Figure 1 Atomic LS Return Fuel System.

In-Tank Pumps The MSD Atomic Fuel Pump (not supplied) can be used in the tank however it would require a sock, or ﬁlter element, on the pickup side. It is important to note that the wiring used to run the pump will need to meet requirements to be submersed in fuel. When wiring an in-tank pump, it is recommended to use a wire that conforms to SAE speciﬁcations J1128 and J378. This wiring features a Thermoplastic insulated wiring with polyvinyl chloride insulation for protection against gasoline, oil, and more. In addition, different fuel line will be required internally if the pump is to be mounted in the tank. Fuel line that meets SAE 30R10 speciﬁcations MUST be used. Failure to do so will cause severe damage to your engine and/or fuel system.

WARNING: Improper installation or use of fuel system components can cause severe damage your

engine and/or fuel system that will not be covered by the manufacturer’s warranty.

Atomic Fuel Pump, PN 2925: This pump features 3/8” inlet and outlet. The pump will support

approximately 525 hp and is approved for in-tank use (no wiring or in-tank mounting hardware/ pickup element are supplied).

Fuel Pump Kit, PN 2920: This Kit is supplied with MSD’s PWM Fuel Pump, a pre and post-ﬁlter, 15-ft

of 3/8 fuel injection line and mounting hardware.

Fuel System Return Kit, PN 2922: If you plan on running a return line with your Atomic LS, this kit

provides another 15-ft of 3/8” injection line, an MSD Regulator and two push-lock ﬁttings.

High Horsepower Fuel Kit, PN 2921: This pump will support the power demands of engines up to 650

horsepower. The pump features 3/8” inlet and outlet. The pump will support approximately 650 hp and is approved for in-tank use (no wiring or in-tank mounting hardware/sock are supplied).

WARNING: MSD’s Push-Lock ﬁttings are designed for use with the MSD fuel hose only. Do not use

the MSD fuel hose with other ﬁttings. Do not use MSD Push-Lock ﬁttings with other fuel hose. Compatibility issues may cause fuel leaks.

MSD • WWW.ATOMICEFI.COM • (915) 855-7123 • FAX (915) 857-3344

INSTALLATION INSTRUCTIONS 5

WIDE BAND OXYGEN SENSOR INSTALLATION

The MSD Atomic EFI system requires a single Wide Band

02 SENSOR

Oxygen Sensor (WBO2) for operation. MSD suggests that the bung for this sensor be installed prior to starting any other part of the conversion process. By having the WBO2 in place ﬁrst, there is a reduced chance of the vehicle being immobilized for an extended time. The bung for the WBO2 provided by MSD has a plug included so that

POSITION AT LEAST 10°

the vehicle can be driven between the time of exhaust modiﬁcation and installing the rest of the Atomic system, if needed.

The WBO2 can be installed in downstream of either

EXHAUST COLLECTOR

Figure 2 WBO2 Sensor Location.

exhaust bank. The sensor connects to the Power Module, so install the sensor on the bank closest to where you plan to mount the Module. The bung should be installed by a qualiﬁed exhaust technician and pressure tested. Proper installation of the oxygen sensor is critical to the performance of the Atomic EFI. Improper installation could lead to engine damage.

1. Locate the ideal spot to install the WBO2. a. This location should be 2-4 inches after the exhaust collector. The sensor must be more than

18 inches forward of the exhaust tip. For applications where short or open headers are used, install the WBO2 in the primary tube of the rear cylinder at least 8 inches away from the exhaust port. The Atomic will not work on “Zoomie” style headers.

b. The WBO2 sensor should be at least 10˚ above horizontal to allow condensation runoff. Without

this angle the sensor is signiﬁcantly more likely to sustain water damage (Figure 2). c. Never place a WBO2 on the outside of a bend. d. The WBO2 must be mounted in the exhaust prior to any catalytic converter, if applicable.

2. Drill a 7/8” hole in the exhaust where the WBO2 will go.

3. Weld in the supplied bung. Ensure the weld goes completely around the bung and is air tight.

4. Insert supplied plug in bung. Never run the vehicle with a WBO2 installed but not powered; it will damage the sensor.

5. When completing the Atomic EFI installation, remove the plug and insert the WBO2 for use. MSD suggests using a small amount of anti-seize on the threads.

Note: The Atomic EFI is extremely sensitive to air leaks in the exhaust system. Any air leak between

the engine and the WBO2 will cause the Atomic to have false readings, which can lead to poor engine performance, misﬁres, and an inability to properly auto-tune. Extended running of the Atomic EFI with an exhaust leak can result in detonation and severe engine damage. Improper installation of the oxygen sensor, and any damage that may result from such an installation, is not covered by the manufacturer’s warranty.

MSD • WWW.ATOMICEFI.COM • (915) 855-7123 • FAX (915) 857-3344

6 INSTALLATION INSTRUCTIONS

INSTALLING THE INTEGRATED FUEL/ECU RAILS

The integrated fuel/ECU rails are supplied with the covers installed. The rails are designed to install to OEM intake manifolds and many aftermarket designs. To prepare the rails for installation, locate the four intake manifold bolts supplied with the Atomic LS Master Kit, as well as the four mounting brackets.

It is important to note at this point, that you have the correct injectors for your application as well as O-ring seals and the injector retainers. These components are not supplied in the master kit.

WARNING: Care must be used when installing the fuel injectors and rail assemblies.

COVER

FUEL RAILFUEL RAIL

DISENGAGE FROM FUEL RAIL

LIFT COVER UP

FUEL RAILFUEL RAIL

LIFT THIS SIDE OF COVER ENOUGH TO CLEAR FUEL RAIL

COVER

FUEL RAILFUEL RAIL

PUSH COVER

Figure 3 Removing Fuel Rail Covers.

The following steps will guide you through the installation of the two fuel rail assemblies.

1. The fuel rails are supplied with the covers in place. Remove the covers to prepare and install the

REAR

BRACKET

rail assemblies (Figure 3). Also, determine which rail is which by reviewing the sensor connectors and location as shown in Figure 9 on page 8.

9 3 2 6 7

2. Figure 4 shows the location for the fuel rail brackets. Remove the hardware from the intake manifold and install

REAR FRONT

the brackets as shown using the supplied longer intake bolts. Use GM 1245383 thread sealant or equivalent on the intake manifold

5 1 4 10

bolts. Note that the passenger rear bracket requires a spacer (supplied) as shown in Figure 4. Torque the new intake bolts to 89 in-lbs. NOTE: If installing the intake manifold

for the ﬁrst time follow the

NOTE: THE PASSENGER

SIDE REAR MOUNT REQUIRES THE SUPPLIED SPACER.

torque sequence in Figure

4. Torque in steps; 44 in-lbs ﬁrst, followed by 89 in-lbs. It is recommended to hold

MUST USE THREAD SEALANT

TORQUE SEQUENCE STEP 1 - 44 LBS/INCH STEP 2 - 89 LBS/INCH

a straight edge against the brackets to ensure alignment while torquing.

MSD • WWW.ATOMICEFI.COM • (915) 855-7123 • FAX (915) 857-3344

Figure 4 Fuel Rail Bracket Locations.

INSTALLATION INSTRUCTIONS 7

3. Locate the four injector harness pigtails. These need to be connected to the fuel rails (Figure 5).

4. With the brackets and injector pigtails installed on the intake manifold, it is time to install the injectors to the fuel rails. Apply a dab of engine oil to the o-ring seals of the injectors. Insert the injector with its connector facing towards the outside of engine into the fuel rail. Install the injector retainer securely and check that it is properly installed and sealed to the rail (Figure 6). Continue with the other three injectors.

5. With the injectors installed, it is time to install the fuel rail assembly to the engine. Position the rail assembly over the intake manifold with the injectors aligning

Figure 5 Connecting Injector Pigtail.

with their mounting pockets on the intake (Figure 7).

6. With the injectors lined up, lightly press down on the fuel rail using caution not to bind any of the injectors or connectors. The fuel rail assembly should come close to contacting the manifold brackets with very little pressure. Use caution not to bind or tear any injector O-rings.

ENSURE THAT THE INJECTORS AND O-RINGS SETTLE INTO THE POCKETS WITH NO BINDING.

Figure 6 Installing the Injectors.

Figure 7 Installing the Rail Assemblies.

MSD • WWW.ATOMICEFI.COM • (915) 855-7123 • FAX (915) 857-3344

8 INSTALLATION INSTRUCTIONS

7. Install the retaining bolts and washers to secure the fuel/ECU rails to the mounting brackets. Move between the retainers as they are tightened to ensure even pressure (Figure 8).

8. Connect the injector wiring, coil packs and other wiring.

9. Repeat (Figure 9) the procedure for the opposite engine bank.

Figure 8 Tighten the Fuel Rail Bolts.

POWER

MODULE

PASSENGER

SIDE

CAN

PWR

CRANK

GND

FGH

MAP

INJ8

INJ6

COILS

2468

CAN

OIL

INJ5

COILS 1357

INJ7

FPS

CAM

GND

PWR

DRIVER

SIDE

INJ3

INJ4

INJ1

INJ2

**FOR DUAL THROTTLE

BODIES

**FOR ENGINES WITH

V V T OPTIONS

IAT

D LPHI

IAC2*

ETC2/ V V T**

(NOT USED)

ECT

IAC

ETC1/

TPS

ALT

NOTE: PAGE 18 SHOWS PINOUTS FOR THE COIL CONNECTORS AND IAC.

Figure 9 Fuel Rails and Connections.

MSD • WWW.ATOMICEFI.COM • (915) 855-7123 • FAX (915) 857-3344

INSTALLATION INSTRUCTIONS 9

Fuel Inlet Fittings and Cross-Over Line: LS engines require a cross-over fuel line to route the fuel from one bank to the other. This is typically done at the front of the engine. Due to the variety of intake manifolds and accessories a cross-over line must be made for each application.

Figure 10 Installing Fuel Hose to the Push-Lock Fittings.

MSD supplies a length of fuel hose and two 90° -6AN ﬁttings to prepare a fuel crossover line. The ﬁttings utilize Push-Lock technology and are designed exclusively for use with the supplied hose. These ﬁttings do not require clamps, however it is imperative to follow the installation instructions.

Proper installation begins with a clean, square cut of the hose. A hose cutting tool or new razor blade are recommended. When installing the hose it is important that the hose is pushed on all the way to the thin beauty ring. This means the hose should fully overlap the inboard barb. Too little of engagement, as well as overengagement, will result in a compromised connection that is prone to failure. Figures 12 and 13 illustrate the required installation of the hose and ﬁttings.

Figure 11 Installing Fuel Hose to the Push-Lock Fittings.

1. Determine the length of hose needed. Mark the hose and cut it using a hose cutter or new razor blade.

CORRECT CLEAN, SQUARE CUT

There should be minimal disturbance of the outer jacket, braids and inner liner. The cut plane should be perpendicular to the hose axis. (Figure 12).

2. Before installing the hose to the ﬁtting, it is important to anchor the ﬁtting. Proper installation cannot be achieved by holding the hose and ﬁtting in your

INCORRECT JAGGED, ROUGH CUT RESULTS IN A COMPROMISED CONNECTION

hands. For best results, the hose should be installed with minimal twisting or pausing.

Figure 12 Severing the Hose Properly.

3. Apply a light coat of oil to the barbs on the ﬁtting. Use care not to get oil on the outside of the hose as it will be impossible get a ﬁrm grip on the hose.

4. With the ﬁtting anchored securely, push the hose

Properly Installed Push-Lock Fitting

END OF HOSE IS FLUSH WITH THE THIN EDGE OF THE BEAUTY RING.

over the barbs. The hose is properly installed when it is ﬂush with the thin edge of the beauty ring (Figure 13). At this point, the hose end should have rolled over the inboard barb.

WARNING: The supplied MSD Push-Lock AN

ﬁttings are designed only for use with the supplied fuel hose (Aeroquip AQP FC598). We do not recommend mixing

Improperly Installed Push-Lock Fitting

EXCESSIVE GAP TO BEAUTY RING RESULTS IN A COMPROMISED CONNECTION.

Push-Lock style ﬁttings and hoses from different manufacturers. Doing so may result in fuel leaks and expose other dangerous incompatibilities.

Figure 13 Installed Push-Lock Fitting.

MSD • WWW.ATOMICEFI.COM • (915) 855-7123 • FAX (915) 857-3344

10 INSTALLATION INSTRUCTIONS

POWER MODULE INSTALLATION

The Power Module of the Atomic EFI system handles high current circuits such as the fuel pump and WBO2. The unit has two ports for the MSD CAN system as well as a wiring harness. The CAN ports will provide

CONTROLLER

communication between the Power Module, the passenger side fuel/ECU rail and the Handheld Monitor.

It is important to select a proper mounting location for the Power Module. The unit can be mounted in the interior or the engine compartment as long as it is away from direct heat sources. It is not recommended to mount the unit in an enclosed area, such as the glovebox. When a suitable location is found, make sure all wires reach their connections. Also be sure that the CAN port can be accessed for use with the Handheld Monitor.

Figure 14 Power Module Wiring Diagram.

Use the Power Module as a template and mark the location of the holes. Use a size #20 drill bit to prepare for the supplied self tapping screws. Install the supplied rubber grommets (Figure 14).

POWER MODULE

IP VM HH+ IA UN

CAN ONLY

SLED POWER FAN 1 LAUNCH NITROUS SPEED REF SPEED TACH SW 12V FAN 2 MIL GROUND

RED YELLOW BLK/WHT BLK/RED GREEN BLACK

MONITOR

CONNECTOR

ONLY

HANDHELD

MONITOR

TO PASSENGER

FUEL RAIL

POWER TO

PASSENGER

FUEL RAIL

WIRING

There are a number of electrical connections on the Power Module that are required for proper operation (Figure 15). Other wires, such as the nitrous input, 2-step rev control or electric fan controls, only need to be connected if their optional functions are being used. In the chart below, wires marked “REQ” must be connected for the system to operate while those marked “OPT” are optional depending on the features being used. For the installation it is recommended to connect only the required wires.

FUEL PUMP

GROUND

BATTERY 1*

BATTERY 2*

* BATTERY 1 AND 2

MUST BOTH BE CONNECTED

CONTROLLER

Figure 15 Power Module Wiring Diagram.

MSD • WWW.ATOMICEFI.COM • (915) 855-7123 • FAX (915) 857-3344

INSTALLATION INSTRUCTIONS 11

Power Module

1 2

4-Way

GT Series 16 Way

3 4 A B

D E

F G H

J K

L M N P R S

Deutsch

CONNECTOR

Color

Red Black Orange Red Red Blue Bro/Wht

Brown Lt Blue Gray Red Orange Red Red Yellow Blk/Wht Blk/Red Green Black Lt Green

Use

REQ REQ REQ REQ OPT OPT OPT

OPT OPT OPT REQ OPT REQ REQ REQ REQ REQ REQ REQ OPT

Function

Battery 1, Connect to Positive Battery terminal. Ground, Connect to solid, clean engine ground. Pump, Connect to Fuel Pump Positive terminal. Battery 2, Connect to Battery Positive terminal. Fan 1, Supplies ground to activate Fan 1 Launch, Connect to 12 volts to activate 2-step RPM limit.

Nitrous, When supplied with 12 volts, timing will be retarded and the air/fuel ratio will be corrected to the target nitrous setting. Speed Ref.

Speed Signal Tach, Supplies 12V square wave signal Switched 12V, Connect to ignition switch Fan 2, Supplies ground to activate Fan 2 at desired temperature. Supplies power to the Fuel Rail

H-

WBO2

MIL Ground

H+

It is recommended to connect a Malfunction Indicator Lamp (MIL) to your dash. A simple bulb is required with switched 12 volts on one side and this Light Green wire on the ground side. If there is a malfunction in the system, ground will be supplied through this wire to illuminate the lamp.

STOP HERE

REVIEW YOUR INSTALLATION

It is recommended to review your installation at this point. The 02 Sensor should be installed and connected as well as the Power Module and corresponding wiring. Conﬁrm that all of the rail wiring connections are complete including the injectors and sensors. Ensure all fuel lines and ﬁttings are tight and secure from any heat sources or sharp edges. The next section will require powering the Atomic LS to go through the Initial Setup menus and the fuel pump will run. DO NOT START THE ENGINE AT THIS TIME!

MSD • WWW.ATOMICEFI.COM • (915) 855-7123 • FAX (915) 857-3344

12 INSTALLATION INSTRUCTIONS

PROGRAMMING

The Handheld Monitor is the interface to the Atomic LS EFI system, there is no connection for a PC or laptop. It simply plugs into the Power Module and can be removed once your setup is complete, or can remain connected so you can use features such as the dash or digital gauge displays. The Handheld Monitor features a joystick to scroll through the settings. Scroll up and down to the setting, then push the joy stick to the right to select the options. When the selection is made, either push in, or simply go back (push to the left) to save/conﬁrm your settings.

WARNING: Before turning the ignition key to the On position, conﬁrm all fuel line connections are

tight and all electrical connections are correct.

After conﬁrming all your connections and fuel lines, turn the ignition key to the On position – DO NOT START THE ENGINE. Check every hose and ﬁtting connection for any signs of fuel leaks. The Handheld screen will illuminate and take you to the Main Menu.

MAIN MENU

Six selections will come up the Monitor under the Main Menu. If this is the ﬁrst time powering up the Atomic LS, select Initial Setup (Figure 16). Atomic LS Dash: This selection allows you to view a variety of

engine functions in real time when the engine is running.

Atomic LS Gauges: This setting puts ﬁve important values

in gauge form to ease viewing the data. This includes engine rpm, oil pressure, engine coolant temperature, speed (when connected), battery voltage and air/fuel ratio.

Initial Setup: These are values that are required to start the

engine.

Advanced Setup: Optional settings for features and optimized

driveability settings.

Diagnostics: This screen will help you troubleshoot and identify

potential issues.

Display Setup: Provides adjustments for the appearance of

the monitor screen.

Main Menu

Atomic LS Dash

ENGINE IDENTIFICATION INFORMATION

GM has produced a number of different LS based engine platforms. When setting up your Atomic LS system, it is helpful to know the model engine you have. If you don’t know what engine you have, locate the casting number on the back of the

block, below the driver's side cylinder head (Figure 17). That

number will assist in determining what engine you have and can be looked up at www.atomiceﬁ.com.

If you still have no idea of your engine’s origin, you can select a base calibration from the menu to get the engine started.

MSD • WWW.ATOMICEFI.COM • (915) 855-7123 • FAX (915) 857-3344

Atomic LS Gauges

Figure 16 Monitor Main Menu

Figure 17 Casting

INSTALLATION INSTRUCTIONS 13

INITIAL SETUP PROGRAMMING

Scroll down to Initial Setup and push the joystick to the right. This takes you to several selections that MUST be programmed. Figure 18 shows screen examples.

Engine Type: This value determines the engine platform that

you’re running. Select over 26 engine combinations between LS1, LSA, LY9, etc. There is also a Custom setting for highly modified or aftermarket engines. This setting is important as once an engine type is programmed, other settings will default to the OEM components that were supplied on that engine.

For example, if you select LQ9, the coil, injector and MAP

sensor will automatically set to the OEM component. (You can still put in different values if modiﬁcations have been made.)

•Custom: If you have a custom built engine it is recommended to select the closest Engine Type setting ﬁrst. This will give you a start-up calibration and default settings including the volumetric efﬁciency tables for that series of engine. From there, you can go back into each selection and edit to your speciﬁcations.

Engine Size: Once you select the engine type, the stock cubic

inches will automatically be set. If your engine has been modiﬁed with a different stroke or bore, select and input the size. The range is from 100-800 cubic inches.

Camshaft Type: There are three cam selections to choose;

Street/Stock, Mild and Performance. Note that if the lobe separation angle (LSA) is less than 108°, it is recommended to input the next larger cam. Cams with over 250° are not recommended for use with the Atomic LS system.

Handheld Main Menu

Engine Type

Engine Size

CAM

DURATION AT .050"

Street Less than 210° Mild 211° - 230° Performance Greater than 231°-250°

Camshaft Type

Coils: Once the engine type is selected above, the OEM coil

pack will be automatically selected. However, if you are running a different coil or an MSD LS Coil pack, select the part number.

Coils

Figure 18

MSD • WWW.ATOMICEFI.COM • (915) 855-7123 • FAX (915) 857-3344

14 INSTALLATION INSTRUCTIONS

Injectors: Once the engine type is selected above, the OEM

style injector will be automatically selected. However, if you are running different injectors, select the part number. Most LS based injectors have the part number stamped on them. If using different injectors, you may enter the ﬂow rate in pounds per hour.

MAP Sensor: Once the engine type is selected above, the

OEM MAP Sensor will be automatically selected. However, if you are running a different sensor, you may enter the slope and offset.

Fuel Pump Type: There are three selections for the fuel pump

Fuel Injector Type

system. Select the system that you are using on your vehicle.

• Pulse Width Modulated: This selection is used only when running a returnless fuel system with NO regulator.

• Non-PWM with Regulator: This selection is used when running a return style system with a regulator.

• PWM with Regulator: This selection is used when running a return style system with a regulator. It will run the pump at 50% duty cycle at idle producing quieter pump operation and will increase a duty cycle of 100% as the

Map Sensor

throttle and injector load increase. Note: It is recommended that you use Non-PWM with a

regulator when setting fuel pressure as the PWM setting may decrease fuel pressure slightly at idle depending on the pump used.

Idle RPM Target: Select the rpm that you want the engine to

idle at. The rpm range is adjustable in 25 rpm increments.

Rev Limit: There are two rev limit settings to set; Fuel and

Ignition. Select the rpm range that you want as a rev limiter. The limiter will be activated by either turning off the ignition

Fuel Pump Type

or fuel. You can also select both. The range is 3,000 -12,000 rpm and is adjustable in 25 rpm increments. Default for the fuel limit is 7,000 rpm and 7,100 for the ignition.

Once all of the settings in the Initial Setup menu are selected, the Atomic has enough information to start and run the engine. However, we recommend scrolling through the advanced settings to program selections that may be useful after the initial start up (such as the cooling fan activation temperatures).

Idel RPM Target

Rev Limit

Figure 19

MSD • WWW.ATOMICEFI.COM • (915) 855-7123 • FAX (915) 857-3344

INSTALLATION INSTRUCTIONS 15

ADVANCED SETUP

The Advanced Setup features are optional as the Initial Setup menu provides the Atomic EFI with the values needed to run the engine. Features in the Advanced Menu are designed to deliver additional features and advanced tuning functions to further enhance the driveability and overall performance of your vehicle. Figure 20 shows several examples.

Fans: The Atomic LS allows you to select temperatures to

activate two electric fans. Each circuit will be activated by supplying ground through the Red and Orange wires of the Power Module. A relay is required for both circuits. The fans will be activated at the desired temperature and will remain on until the temperature falls below 10° of the setting. Settings are 100°-300°F.

A/F Targets: The Atomic LS provides an option to set an

air/fuel target for Idle, Part Throttle, Wide Open (WOT), Nitrous and Boost. The Atomic will use its self-learning technology to adjust the fuel delivery to meet the target air/fuel ratio. The values are adjusted in 0.1 increments

and range from rich at 10:1 to leaner at 16:1. The ideal

air/fuel ratio for cruising is called stoichiometric and is

commonly referred as a 14.7:1 air/fuel ratio.

Boost: The Atomic will switch to the commanded Boost A/F

ratio once manifold pressure reaches 110Kpa.

Advanced Setup

Fans

There is also a timing setting for a Wet Nitrous System. When a nitrous system is activated (as shown by supplying 12 volts on the Brown/White Power Module wire), the timing will be retarded. Timing can be retarded up to 20° in 0.1° increments. Note that in order to alter the timing for nitrous use, the Nitrous Selection in the Advanced menu MUST be programmed to ENABLE (see Figure 21).

Ignition Timing Adders: The Atomic provides a base timing

table for each engine application. You can also modify these settings at idle (closed throttle), part throttle and wide open throttle (WOT). Each setting is adjustable +/10°. Note that the values programmed are set for stock engines using 91 octane fuel. For lower octane fuels it is recommended to retard the timing 5° as a starting point.

TPS Enrichment: To assist in throttle transitions the

Atomic EFI has a feature to increase fuel delivery by a prescribed percentage any time there is an increase in throttle position. If needed, make small changes in no more than 5% increments without further testing. Most engines will ﬁnd 25% being sufﬁcient. Most applications will accept 15%-35% enrichment. Adjustable from 0-100% in 1% increments.

MAP Enrichment: To assist in manifold pressure transitions

the Atomic EFI offers a MAP enrichment feature. This functions by adding fuel based on MAP transitions while moving the throttle. Large cam vehicles with low vacuum generally required a slightly smaller number while stock/small camshaft vehicles with a high vacuum

A/F Targets

Igniton Timing

TPS Enrichment

Figure 20

MSD • WWW.ATOMICEFI.COM • (915) 855-7123 • FAX (915) 857-3344

16 INSTALLATION INSTRUCTIONS

may require more. If needed make small changes of no more than 5% increments without further testing, 25% is sufﬁcient for most engines but between 15-35% is normal. Typically, the higher the vacuum the higher the percentage needed. Adjustable from 0-100% in 1% increments.

Nitrous: If you are planning on running a wet nitrous system

on your LS engine, you will need to select Enable. There is a Dark Brown/White wire from the Power Module

MAP Enrichment Setting

that needs to be connected to the switched 12 volts that activate the nitrous solenoids. When 12 volts are supplied (nitrous is activated) the Atomic LS will trim the Target Air/Fuel Ratio and the ignition timing to the programmed setting (see the A/F Target and Timing settings above).The default is Disable.

Calibrate Speed: If there is speed output on the transmission,

a reference signal can be delivered to the Atomic LS. This will assist in smooth transitions between shifts or for quick transitions from high rpm to idle conditions.

Enable or Disable Nitrous

The Power Module has a Brown wire and a Light Blue wire. These wires connect to a magnetic pickup on a driveshaft such as a driveshaft sensor from Racepak. To program the calibration, have a passenger use the Handheld Monitor as you drive to 40mph. Once 40 mph are obtained, select YES on the handheld. This will calibrate the speed input.

Racepak Dash: If you are running a Racepak Dash, such

an IQ3, the Atomic can communicate information to the unit. Select Enable if using a Racepak dash. Disable is default. Racepak offers an optional V-net sensor to connect their dash to the MSD Can-Bus connector.

Speed Reference Setting

Racepak Dash Option

Figure 21

MSD • WWW.ATOMICEFI.COM • (915) 855-7123 • FAX (915) 857-3344

INSTALLATION INSTRUCTIONS 17

PRE-START CHECK LIST

At this point,you're ready to start the engine. Before attempting to start your vehicle with a newly installed

Atomic EFI system, MSD recommends running through the following check list to help ensure a safe and successful start.

• Double-check all wiring.

• Power and Ground are run directly to the battery.

• The small Red “12V switched” wire from the Power Module will have power during both Key On and

Cranking.

• The Power Module, fuel pump, fuel lines, and wires are securely mounted away from heat sources

and pinch points.

• Wide Band Oxygen Sensor is installed in a proper location.

• There are No known exhaust leaks.

• Throttle linkage is complete and operational from the pedal.

• Handheld receives power during Key On.

• You have completed each step of the Initial Setup in the Handheld.

• At Key On the fuel pump primes.

• Fuel pressure is adjusted to 58-62 psi if using a regulator.

• There are No fuel leaks when system is under pressure.

• Check for proper fuel pressure on Handheld Dash. If you do not see fuel pressure, you may need

to prime the pump more than once.

• When ready to start engine, watch for Engine RPM on Handheld Dash to know that Atomic is getting

proper input.

HANDHELD DISPLAY OPTIONS

Using the features in this section, users will be able to control the look of the Handheld unit. This section is also home to information regarding the Firmware and resets (Figure 22).

LCD Contrast: Adjust the contrast on the LCD screen

if it is hard to see the display. Brightness is adjusted using the joystick to go up or down in ﬁve percentage increments.

Backlight Level: The brightness of the screen is

determined by this setting. The Backlight Level may need to be adjusted depending on outside light levels. Brightness is adjusted using the joystick to go up or down in ﬁve percentage increments.

Display Units: The Atomic can display items in either

English (cubic inches, Fahrenheit) or Metric (liters, Celsius).

Figure 22 Monitor Display Selections

Set Atomic Defaults: Use this feature to reset the

Atomic EFI. Selecting “YES” on this screen will take all setting, including fuel maps, back to the factory defaults. Typically this will only be done when the Atomic is being installed on a different engine.

Firmware Versions - This is where information can be found on what is controlling the Atomic. If MSD

releases an update, use this screen to determine which ﬁrmware is currently in the system to compare to the number of the release.

MSD • WWW.ATOMICEFI.COM • (915) 855-7123 • FAX (915) 857-3344

18 INSTALLATION INSTRUCTIONS

CONNECTOR AND WIRING INFORMATION

The following charts show the color, function and location on each connector in case you need to remove or extend the wiring for relocated coils or a reversed intake manifold mount. More information is available at www.atomiceﬁ.com

COIL CONNECTOR, CYLINDERS 2, 4, 6, 8

BLACK Pin-A Ground TAN Pin-B Coil-2 LIGHT GREEN Pin-C Coil-4 BROWN Pin-E Sensor Ground WHITE Pin-F Coil-6 LIGHT BLUE Pin-G Coil-8 PINK Pin-H 12 Volts Supply Pin-D NOT USED

COIL CONNECTORS, CYLINDERS 1, 3, 5, 7

BLACK Pin-A Ground BLUE Pin-B Coil-7 BROWN WHITE Pin-C Coil-5 BROWN Pin-E Sensor Ground GREEN Pin-F Coil-3 TAN Pin-G Coil-1 PINK Pin-H 12 Volts Supply Pin-D NOT USED THROTTLE POSITION SENSOR (TPS) ORANGE PIN-1 5V Reference BLACK PIN-2 Ground BLUE PIN-3 Signal out IDLE AIR CONTROL (IAC) ORANGE Pin-A Coil 1B GRAY Pin-B Coil 1A BLUE Pin-C Coil 2A BLACK Pin-D Coil 2B INTAKE AIR TEMPERATURE (IAT) BLACK Pin-A Ground VIOLET Pin-B Signal

DIAGNOSTICS

There is a self-diagnosing system built into the Atomic EFI. Each covered parameter can show a status in one of three ways.

“OK”: the parameter is functioning normally. “Error C”: there is currently an error occurring. “Error H”: there was previously an error that has been remediated

within the last ten ignition cycles.

CLEAR FLOOD

If a ﬂood condition occurs, turn the key on then press the accelerator to wide-open throttle. This tells the ECU to turn off the injectors. Crank the engine to clear the ﬂood condition until the engine starts (release the throttle open start-up).

Note: The TPS is self calibrating so the key must be in the On position prior to pressing the accelerator.

MSD • WWW.ATOMICEFI.COM • (915) 855-7123 • FAX (915) 857-3344

Figure 23

INSTALLATION INSTRUCTIONS 19

The following chart gives the most likely solution(s) to each possible error.

CLEARING HISTORY ERRORS

There are two ways to clear an error. First, the code will erase after 10 key cycles. Second, is to simply navigate to the message screen and push the joystick down to clear the codes.

CODE NAME

TPS

MAP

IAT

ECT

BATT

INJ DC

FUEL PRESSURE

WBO2

WHAT IT MEANS

There is no reading for the Throttle Position Sensor.

There is no reading for the Manifold Absolute Pressure Sensor.

There is no reading for the Inlet Air Temperature Sensor. The ECU will default to 275°F when shorted or -40°F when open.

There is no reading for the Engine Coolant Temperature Sensor. he ECU will default to 275°F when shorted or

-40°F when open.

The Atomic is receiving the wrong voltage. The unit is measuring either less than 9 volts or greater than 16 volts.

Excessive Injector Duty Cycle

There is no reading for the Fuel Pressure Sensor.

A. "NOT CONNECTED" indicates that no sensor is detected. B. "ERROR" indicates that the sensor has failed.

PROBABLE CORRECTION(S)

The sensor may be at fault.

The sensor maybe at fault.

Check to see that the sensor is properly installed and plugged in. If the sensor is connected but there is no signal, it will need to be replaced.

Check that the Atomic has power and ground directly from

the battery. Also be sure the vehicle's battery and charging

system are in proper working order.

If you are running a returnless fuel system your engine's needs may exceed the Atomic's maximum capabilities. If you

are running a return system check to see that you are maintaining the recommended fuel pressure. If you have adequate

fuel pressure the engine's needs may exceed the Atomic's

system capabilities.

The sensor will need to be replaced.

A. Check to see that the sensor is securely plugged into the system. B. The sensor will need to be replaced.

Note that 'warming up' is normal during start-up for the rst 20

seconds.

FP CAV

MAP SELECT

BARO

This code will set if there is an issue with Fuel Pump Cavitation (similar to vapor lock). It can only set when running a returnless fuel system. This may occur when the commanded fuel pressure (from the ECU) is different than the fuel pressure (at the sending unit).

ECU compares the MAP reading with the Baro reading on key up. If these are different by more than 5kPa, the code is activated.

The baro sensor on the board is out of range. It will use the last know good value.

This means you need to review your fuel pump system and conﬁrm that your application meets the requirements to run a returnless (PWM) system. Also check the ﬁlters, the sock in the tank and inspect the lines for any kinks or pinches that would affect the fuel ﬂow and pressure of the system. If everything checks okay and the code continues, you may need to move to an in-tank pump, or use a regulated (return) fuel system.

Double check your MAP selection and make sure that you selected the correct P/N of sensor. It could also mean a problem with the Baro or MAP sensor itself (see above codes).

Turn the key off, wait 10 seconds and turn back on to see if the code remains. If so, call customer service. As long as the vehicle has not changed altitude by a large amount since the last key off (towed somewhere), everything will function normally.

MSD • WWW.ATOMICEFI.COM • (915) 855-7123 • FAX (915) 857-3344

20 INSTALLATION INSTRUCTIONS

TECH NOTES

_________________________________________________________________________________________________________________________

Service

In case of malfunction, this MSD component will be repaired free of charge according to the terms of the warranty. When returning MSD components for warranty service, Proof of Purchase must be supplied for veriﬁcation. After the warranty period has expired, repair service is based on a minimum and maximum fee.

All returns must have a Return Material Authorization (RMA) number issued to them before being returned. To obtain an RMA number please contact MSD Customer Service at 1 (888) MSD-7859 or visit our website at www.msdperformance.com/rma to automatically obtain a number and shipping information.

When returning the unit for repair, leave all wires at the length in which you have them installed. Be sure to include a detailed account of any problems experienced, and what components and accessories are installed on the vehicle. The repaired unit will be returned as soon as possible using Ground shipping methods (ground shipping is covered

by warranty). For more information, call MSD at (915) 855-7123. MSD technicians are available from 7:00 a.m. to 5:00 p.m. Monday - Friday (mountain time).

Limited Warranty

SD warrants this product to be free from defects in material and workmanship under its intended normal use*, when properly installed and purchased from an authorized MSD dealer, for a period of one year from the date of the original purchase. This warranty is void for any products purchased through auction websites. If found to be defective as mentioned above, it will be repaired or replaced at the option of MSD. Any item that is covered under this warranty will be returned free of charge using Ground shipping methods. This shall constitute the sole remedy of the purchaser and the sole liability of MSD. To the extent permitted by law, the foregoing is exclusive and in lieu of all other warranties or representation whether expressed or implied, including any implied warranty of merchantability or ﬁtness. In no event shall MSD or its suppliers be liable for special or consequential damages. *Intended normal use means that this item is being used as was originally intended and for the original application as sold by MSD. Any modiﬁcations to this item or if it is used on an application other than what MSD markets the product, the warranty will be void. It is the sole responsibility of the customer to determine that this item will work for the application they are intending. MSD will accept no liability for custom applications.

MSD • WWW.ATOMICEFI.COM • (915) 855-7123 • FAX (915) 857-3344

FRM31441 Created 12/12 Printed in U.S.A.

MSD 2950 Installation

Specifications and Main Features

Frequently Asked Questions

User Manual