Description

The Atomic 2 EFI system by MSD incorporates four 100LB/HR fuel injectors, supporting up to 650 HP in naturally aspirated applications or 635 HP in forced induction setups. This system is designed to fit on a 4150 intake manifold, providing sufficient clearance for factory air cleaners.

Key Features:

Direct replacement for common 4-barrel carburetors with a 4150-style (square bore) flange.
Master Kits include a complete fuel system with an external fuel pressure regulator preset to 58.5psi, 20ft of 3/8” EFI Rated Fuel Hose, Fuel Pump, Filters, necessary hardware, and bulkhead fitting to return fuel into the tank.
Throttle body flows 865 CFM and features 1 ¾” throttle plates.
Booster design offers superior fuel atomization.
ECU is 100% incorporated into the throttle body, eliminating the need for a separate Power Module.
Improved Calibration Wizard for easy setup, tuning, and gauge displays on a high-resolution 3.5” touchscreen.
Optional laptop tuneability for fine-tuning and unique engine combinations or boosted applications up to 21.5 PSI.
Built-in nitrous control supports wet/dry nitrous applications.
Integrated ignition timing control with an ignition coil driver, eliminating the need for an ignition box.
Only four wiring connections required (Battery +, Battery -, Switched Ignition & RPM).
Available in a durable black ceramic finish or raw aluminum.
Throttle body linkage now includes kickdown support for 200R4, 700R4, C4, and C6 transmissions.
Higher horsepower rating, supporting up to 650 HP naturally aspirated or 635 HP forced induction with four 100 Lb/Hr injectors.
Roller bearing throttle shafts for smooth throttle feel and reduced pedal effort.
External fuel pressure regulator required, set to a base pressure of 58.5 PSI.
Fuel pump control built-in with a 40 amp relay.
Fan control eliminates the need for an external fan controller.
OEM-style TPS/IAC and fuel pressure sensor for dependable service and easy replacement.
Includes a Genuine Bosch LSU 4.9 Wideband Oxygen Sensor for real-time fuel map learning.
Compatible with MSD, Holley Hyperspark, and OEM ignition systems.
Compatible with Holley EFI digital dashes, gauges, and fuel system accessories.

The Atomic 2 EFI system ensures quick starts, smooth idle, and excellent throttle response while offering advanced self-learning technology for optimal performance and drivability.