This Holley Terminator X Max kit provides fuel and spark control, plus 4L60E/4L80E transmission control, for GM LS1/LS6 engines with a 24x crank reluctor, 1x cam and EV6 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 Bluetooth module as its display and interface.
Key Features:
- Built for GM LS1/LS6 engines with a 24x crank reluctor and 1x cam, using EV6 injectors, with 4L60E/4L80E transmission control
- 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, EV6 injector harness, 4L60E/4L80E transmission control harness, Terminator X Max ECU, ECU main power harness, Bosch LSU 4.9 wideband oxygen sensor, input/output harness and assorted vacuum adapters
Specifications:
- Engine: GM LS1/LS6
- Crank/Cam Reluctor: 24x crank, 1x cam
- Ignition Type: GM LS 24x
- Injector Connector: USCAR (EV6)
- Throttle Control: Drive-by-cable (DBC), no drive-by-wire control
- Transmission Control: 4L60E/4L80E
- MAP Sensor: 1-bar, internal
- Display/Interface: Bluetooth Module
- Color: Black
- Part Number: 550-919-B
Not recommended for 4x4 applications with electronic transfer cases. Not compatible with 4L6X transmissions from model year 1995 or earlier because of year-by-year changes in converter lockup and downshift strategy. The ECU is not recommended for marine use; it can be used off-road when mounted in a safe, dry location protected from heat, with proper wiring management.
FAQ
What engines does the 550-919-B Terminator X Max kit fit?
GM LS1/LS6 engines with a 24x crank reluctor and 1x cam, using EV6 injectors.
Does it control the transmission?
Yes. The kit includes 4L60E/4L80E transmission control and a transmission control harness.
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 550-919-B?
Holley lists this bundle with a Bluetooth module. The free Terminator X software also allows full laptop tuning.
Can this be used on a 4x4 truck?
Holley does not recommend it for 4x4 applications with electronic transfer cases.
