New Features From Holley’s Atomic 2 EFI

Holley recently announced the release of the latest iteration of the ever-popular Atomic EFI system. The Atomic 2 system from MSD. This new system features 4 100LB/HR Fuel Injectors that are capable of supporting up to 650 HP naturally aspirated of 635 HP on forced induction applications. The Atomic 2 ECU is capable of fuel map self-learning and ignition timing control. This system also improves idle stability, drivability, and wide-open throttle horsepower!. It is designed to fit on a 4150- style intake manifold while having plenty of clearance for factory air cleaners.

What is great about the Atomic 2 is that it provides the performance and drivability benefits that you would expect from fuel injection. It has a quick start, smooth idle, and a great throttle response. That is just naming a few amazing pros as well. Now combine this with the fact that Atomic 2 will support ignition timing directly through the ECU and you definitely have a win-win combination. That’s right, the initial timing is handled through a compact handheld monitor. All you have to do is simply answer a few easy to answer to car guy questions and your engine and you’re off and running!

The Atomic 2 comes in either a raw finish or black finish.

Here is a list of all the great features the Atomic 2 has to offer:

  • Direct replacement for common 4-barrel carburetors with 4150-style (square bore) flange
  • NEW Throttle Body Flows 865 CFM and features 1 ¾” Throttle Plates
  • NEW Booster design offers superior fuel atomization
  • NEW ECU is 100% incorporated into the throttle body – no separate Power Module to mount
  • NEW and Improved Calibration Wizard – Answer a few simple questions about your engine and it creates the base map, then starts tuning on its own! NO laptop required!
  • NEW High-Resolution, Full Color, 3.5” Touchscreen for Initial Setup, Tuning, and Gauge Displays
  • NEW Optional Laptop Tuneability – Ideal for fine tuning and unique engine combinations or for Boosted applications up to 21.5 PSI
  • IMPROVED Built in Nitrous Control supports wet/dry nitrous
  • Integrated ignition timing control – includes an ignition coil driver, no ignition box required
  • Only 4 Wiring Connections Required! (Battery +, Battery – , Switched Ignition & RPM)
  • NEW Black Ceramic Finish Option for durable, modern looks. Also available in raw aluminum
  • NEW Higher Horsepower Rating – Supports 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 less pedal effort
  • External fuel pressure regulator required, set to a base pressure of 58.5 PSI, such as Holley 12-882. (Only on PN 2910-2 and 2910-2BK).
  • Fuel pump control built-in with a 40 amp relay
  • Fan control eliminates the need for external fan controller, simply wire a relay to the fan and tell the Atomic 2 ECU the desired fan activation temperature
  • NEW OEM Style TPS/IAC and Fuel Pressure sensor, for years of dependable service and easy replacement
  • The included Genuine Bosch LSU 4.9 Wideband Oxygen Sensor provides real-time Fuel Map Learn!
  • NEW – Includes clamp-on oxygen sensor kit for simplified, leak free installation. Stainless Steel T-Bolt clamps and a Stainless Steel (Weldable) oxygen sensor bung included
  • NEW – Compatible with MSD, Holley Hyperspark and OEM Ignition Systems
  • NEW – Compatible with Holley EFI digital dashes, gauges and fuel system accessories

Want to know more on why you should swap your carb set up to EFI? Click here.

Article Sources

More Sources

About the author

Laura Lazar

An automotive, photography, history and travel nut. Hanging out coast to coast at car shows and races is her idea of a perfect life. Laura may a small problem with collecting show and project vehicles but her 1st love will always be her 64 Caddy.
Read My Articles

Hot Rods and Muscle Cars in your inbox.

Build your own custom newsletter with the content you love from Street Muscle, directly to your inbox, absolutely FREE!

Free WordPress Themes
Street Muscle NEWSLETTER - SIGN UP FREE!

We will safeguard your e-mail and only send content you request.

Street Muscle - The Ultimate Muscle Car Magazine

We'll send you the most interesting Street Muscle articles, news, car features, and videos every week.

Street Muscle - The Ultimate Muscle Car Magazine

Street Muscle NEWSLETTER - SIGN UP FREE!

We will safeguard your e-mail and only send content you request.

Street Muscle - The Ultimate Muscle Car Magazine

Thank you for your subscription.

Subscribe to more FREE Online Magazines!

We think you might like...



Classic Ford Performance

Drag Racing

Classic Chevy Magazine

Street Muscle - The Ultimate Muscle Car Magazine

Thank you for your subscription.

Subscribe to more FREE Online Magazines!

We think you might like...

  • Classic Ford Performance
  • Drag Racing
  • Classic Chevy Magazine

Street Muscle - The Ultimate Muscle Car Magazine

Thank you for your subscription.

Thank you for your subscription.

Street Muscle - The Ultimate Muscle Car Magazine

Thank you for your subscription.

Thank you for your subscription.

Loading