Instead of a cumbersome wiring harness lying all over the top of the engine, a single power cable runs from the throttle body to the power controller. The power controller is just what it sounds like—it controls all the other important functions outside of the ECU: electronic fan controls, electronic fuel pump, and the Wide Band O2 sensor. Unlike a giant wiring harness, MSD’s CAN-Bus Network plugs in with a single connection. Speaking from experience, building an EFI harness can be a time-consuming and delicate process. Often times, wiring harnesses must be built to suit the owner’s desire to hide the wires and make it not look like an EFI system.

One of the greatest strengths, if not the best part of the whole system, is how you program the Atomic. You don’t need a laptop computer to create extensive fuel and ignition tables. MSD made it way too simple, with the handheld controller. When you are ready to power up your Atomic, it prompts you with simple questions about your engine. Built-in fuel maps, combined with self-learning technology inside the ECU, eliminate the need for a laptop or user tuning. Push the joystick on the handheld controller left, right, up, or down to move through all the prompts and options. Within minutes the proper setup for your engine is complete. If that isn’t enough, the handheld controller also doubles as a dash display for all that is happening inside your system.

Let’s take a second to talk about all the fabrication work involved with the system. If you have welding equipment, weld in the supplied O2 sensor bung. If not, go to your local muffler shop and have them weld it in for you. This must be performed for the system to operate correctly. The only other extra task is that you must run a wire to your coolant temp sensor. That’s it! Other than some wires for power and grounds, it is incredibly simple to install. A very strong point that I like about the system is that it doesn’t require heavy modification to your existing car, meaning that you can return back to a carburetor and remove the system and incur zero damage to the vehicle. You can even move the kit from one car to another. The self-tuning feature of the system is its strength. Install it, follow the prompts on the handheld controller, and you’re off to the races.

The ATOMIC EFI system is rated to handle 100 to 525 horsepower in its standard configuration. If your application requires more, MSD has a fuel pump upgrade kit that takes it from 525 to 625 horsepower. Most guys can install the system in one day, with pre-preparation such as the minimal welding. A weekend’s worth of time and you’re cruising with an EFI-equipped Mopar. MSD has worked very hard to make this a system to achieve the goals that they set out to get, namely simplicity and performance. In my opinion, they knocked it out of the park. If you have been sitting on the fence about installing and living with an EFI system, your wait is over. Follow along as we install this system on a ’69 Plymouth Road Runner. This car is fairly typical in that it has a 400-horsepower 383 engine, runs on pump gas, and is primarily a driver.

Costs for MSD Atomic Electronic Fuel Injection: $2,428.60

Driving impressions

After the initial programming is done and you have the car running, what’s it like? Well, the engine starts a lot easier than it did with a carburetor. It was weird to feel the car tune itself. It would just keep running better and better. No timing light, vacuum gauge, or box of carburetor jets. The owner of this car wants to get electric fans, so he can run the fan option that comes with the kit. The more you drive the car, the more it self-tunes, and the better it gets. The software that MSD has developed is top-notch. We didn’t get a chance to do some mileage comparisons due to time constraints, but it feels and drives a lot more efficiently. Who would have thought that an old 383 engine from 40-plus years ago could run as smoothly as a new car? The system is even getting used to doing burnouts. If you have been on the fence about EFI, now is the time to jump in. If you have some basic tools, this can be done on a Saturday, but I recommend a weekend. It was really too much fun installing this system. We spent more time figuring out where to mount the power controller than anything else. It’s super easy and yields big results. It’s time to join the Atomic Age.

MSD Performance
1350 Pullman Dr., Dock #14
El Paso
TX  79936