This Holley Terminator X kit provides fuel and spark control for GM LS1/LS2/LS6 engines with a 24x crank reluctor, 1x cam and EV1 injectors. The ECU uses real-time fuel learn, high-impedance injector drivers, an integrated 1-bar MAP sensor and 4 programmable inputs and outputs, and it comes loaded with base maps for common engine combinations. Holley packages this version with a 12.3 in. Pro Dash and a Bluetooth module as its display and interface.
Key Features:
- Built for GM LS1/LS2/LS6 engines with a 24x crank reluctor and 1x cam, using EV1 injectors
- Real-time fuel map learn takes the guesswork out of tuning the base fuel table
- High-impedance injector drivers safely power most stock LS injectors and Holley EFI injectors (low-impedance injectors are not supported)
- Bosch LSU 4.9 wideband oxygen sensor relays air/fuel ratio data to the ECU for accurate readings and tuning control
- On-board 1-bar MAP sensor suits naturally aspirated or nitrous combinations; for 2-bar or higher needs Holley recommends GM sensor 12592525 with Holley adapter 558-416
- MAP sensor vacuum hose adapters included (1/8, 1/4 and 3/16 in.)
- 4 programmable inputs (12V, ground, 5V and frequency) for items such as pressure sensors, nitrous activation triggers or a trans brake
- 4 programmable outputs (ground and PWM) for electric fans, boost control, nitrous control, IAC kits and more
- Boost control by time, gear, RPM and speed, with boost safeties
- Single-channel nitrous control, wet or dry, progressive or non-progressive, with rich/lean safeties and a closed-loop AFR target
- Advanced tables (four 1D, one 1D per-gear, four 2D and one 2D per-gear) for custom strategies such as a flex fuel offset or a fuel or oil pressure safety
- On-board diagnostic LEDs for ECU power, engine run, wideband status, TPS calibration, crank signal and cam signal
- Compact ECU mounts almost anywhere (diagnostic LEDs must face up)
- Plug-and-play compatible with Holley EFI gauges, shift lights, modules and digital/pro dashes (Holley P/Ns 553-106, 553-111 and 553-112)
- Free Holley EFI tuning software gives advanced users full laptop access
- Includes 24x LS engine main harness, EV1 injector harness, Terminator X ECU, ECU main power harness, Bosch LSU 4.9 wideband oxygen sensor, input/output harness and assorted vacuum adapters
Specifications:
- Engine: GM LS1/LS2/LS6
- Crank/Cam Reluctor: 24x crank, 1x cam
- Ignition Type: GM LS 24x
- Injector Connector: Jetronic/Minitimer (Bosch EV1)
- Throttle Control: Drive-by-cable (DBC), no drive-by-wire control
- Transmission Control: None
- MAP Sensor: 1-bar, internal
- Display/Interface: 12.3 in. Pro Dash w/ Bluetooth Module
- Color: Black
- Part Number: 550-903-2
Terminator X ECUs are designed to be mounted with the diagnostic LEDs facing up.
FAQ
What engines does the 550-903-2 Terminator X kit fit?
GM LS1/LS2/LS6 engines with a 24x crank reluctor and 1x cam, using EV1 injectors.
Does it control the transmission?
No. Holley lists this kit without transmission control.
Is this a drive-by-wire kit?
No. It is a drive-by-cable (DBC) kit without drive-by-wire throttle control.
What display comes with the 550-903-2?
Holley lists this bundle with a 12.3 in. Pro Dash and a Bluetooth module. The free Terminator X software also allows full laptop tuning.
What MAP sensor does it use?
An on-board 1-bar MAP sensor, suited to naturally aspirated or nitrous combinations. For 2-bar or higher needs, Holley recommends GM sensor 12592525 with adapter 558-416.
