As more and more Mopar enthusiasts opt to swap a late-model Hemi into their early Detroit iron, the complexities of the electronics of these new engines can lead to frustration. There are requirements to modify the OEM wiring harness, and there are constant struggles to get the PCM to work with the harness in the early Mopars. Holley has recently introduced the Terminator X (and Terminator X Max) controller for the 2003-2013+ G3 Hemi, which greatly reduces the difficulties of using the Hemi’s electronic components.

The Terminator X provides a plug-and-play engine controller solution along with options for boost and nitrous controls. Additionally, the Terminator X is compatible with Holley EFI accessories, which include analog gauges, shift lights, modules/controllers, and their Pro Dash systems. Depending on your engine (non-VVT 5.7L, 6.1L or 6.4L) and fuel injector harness configuration (EV1 – Jectronic/Minitmer (Bosch) or EV6 – USCAR), there are four different options (part nos. 550-1222, 550-1223, 550-1224, or 550-1225) offered by Holley to cover your Hemi’s combination. The Terminator X high impedance fuel injector drivers will operate factory stock injectors or aftermarket Holley injectors.

Above left: The Terminator X GEN III Hemi kit includes an electronic control unit (ECU), a touchscreen handheld, a pair of Bosch LSU 4.9 wideband Oxygen sensors (Lambda sensors), a built in 1-bar manifold absolute pressure sensor (MAP), and all the harnesses necessary to control the Hemi’s electronics. Above right: The Terminator X has eight built-in LEDs in the ECU. The flashing of these LEDs will provide vital information about the Hemi and will display any potential problems that occur with the operation of the components on the Hemi.

Included with all the G3 Hemi Terminator X kits are Bosch LSU 4.9 wideband Oxygen sensors (Lambda sensors), a built in 1-bar manifold absolute pressure sensor (MAP), an electronic control unit (ECU), a touchscreen handheld, vacuum hose adapters, and all the required harnesses. The internal MAP can be disabled if boost applications are utilized. With the presence of boost, a terminated connector allows a seamless installation to utilize an external MAP sensor harness.

The compact size of the ECU allows it to be mounted in nearly any location in the automobile. The ECU should be mounted face up so the eight built-in on-board diagnostic LEDs can be monitored for system operation and any latent software/hardware concerns. A 3.5-inch touchscreen handheld allows the operator the ability to build base tunes, data log, and develop custom gauge displays.

Above left: The Terminator X ECU requires only four harness connectors to operate. There is a harness for the power to the controller. There are two connectors that allow communication between the computer and the sensors and actuators. Connector J1A is designed primarily as the input connector, and connector J1B is the output connector. Finally, there is an internal MAP sensor connector. Above right: There is a great deal of user input control. This is accomplished using the 3.5-inch touchscreen handheld. The Terminator X controller includes free software full of base tables and maps necessary to operate the Hemi.

Lastly, if you desire some type of power adder, the Terminator X has integrated boost control with the handheld, which allows simple engine timing or air-fuel ratio (AFR) changes. If you are a more advanced tuner, the Terminator X has well-designed boost control software that enables the user to determine the boost by time, gear, RPM, or speed, and all the adjustments work with the software’s pre-programmed safety controls. With the use of nitrous, the handheld provides options to adjust the minimum/maximum RPM for the nitrous activation, set the target AFR, control the engine ignition timing, and develop custom curves for ignition timing and the nitrous percentage.

With the introduction of Holley’s Terminator X, you now have an additional option when it comes to how the Hemi will be electronically controlled. The Terminator X will operate factory components or will equally control aftermarket parts, and the Terminator X provides a plug-and-play engine control with optional user input. If you are in the middle of a swap or are considering one in the future, check out Holley’s website for a list of the full benefits of the Holley Terminator X.

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