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Compact black ECU with wiring harness and oxygen sensor

HOLLEY

HOLLEY TERMINATOR X MPFI W/TRANS car electronics accessory

SKU CH-Q96J-RC305

Self-learning EFI kit with real-time fuel-map tuning, high-impedance injector drivers, nitrous control and plug-and-play wiring for LS engines

  • Product typeInstallation Tools
  • Real-time fuel map learn simplifies tuning
  • High-impedance injector drivers safely power stock LS injectors
  • Single-channel nitrous control supports wet or dry progressive modes
  • Plug-and-play compatibility enables straightforward installation
  • Compact ECU size allows flexible mounting locations

LS Engine Management

The Holley Terminator X MPFI with transmission control is an aftermarket ECU kit designed for LS engine swaps and custom builds. It bundles the ECM, wiring harness and an oxygen sensor so the installer has the core electronics in one package. The system targets builders who want self-learning fuel calibration without committing to a full standalone harness design.

Real-Time Fuel Map Learn

The defining feature is the real-time fuel-map learn function that automatically adjusts the base fuel table while the engine runs. High-impedance injector drivers are included to safely operate most stock LS injectors without external ballast resistors. A single-channel nitrous control circuit supports wet or dry, progressive or non-progressive setups.

Plug-And-Play Harness And Sensors

The supplied wiring harness and oxygen sensor eliminate the need to source separate loom components or fabricate sensor mounts. No intake manifold, fuel rails, fuel pump, regulator or distributor are included, so the builder must supply those items separately. The compact ECU case allows flexible mounting locations inside the vehicle.

How it compares

Measured against everything we stock in Car Audio Accessories & Wiring, at today’s prices. Recalculated every night.

Price $1,828.99
Pricier than about 98% of the 2,768 comparable items (median $21.99).

Specifications

Product
Product typeInstallation Tools

Questions about this item

How does the real-time fuel map learn feature work once the ECU is installed in my LS engine?

The system continuously adjusts the base fuel table while the engine runs, removing the need for manual guesswork during initial tuning.

What type of injector drivers are built into this ECU and which injectors can they safely power?

High impedance injector drivers are included and will safely operate most stock LS injectors.

What physical space is required to mount the compact ECU in the vehicle?

The small ECU size allows mounting in virtually any location with sufficient clearance for the wiring harness connections.

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