This Terminator X Max system adds 4L60E/4L80E automatic transmission control and drive-by-wire throttle body control to Holley's Terminator X platform, along with real-time fuel learn, high-impedance injector drivers, and an integrated 1-bar MAP sensor for GM Gen IV LS engines (4.8/5.3/6.0 truck and LS2/LS3). A 3.5in touchscreen handheld provides a guided calibration wizard, real-time tuning, data logging, and a fully customizable gauge display, and the kit ships loaded with base maps for common LS combinations.
Key Features:
- Designed for GM LS 4.8/5.3/6.0 truck engines and LS2/LS3 with 58x crank, 4x cam, EV6 (USCAR) injectors, and 4L60E/4L80E transmission control
- Real-time fuel map learn removes much of the guesswork from base fuel table tuning
- High-impedance injector drivers safely power most stock LS injectors and Holley EFI injectors (does not control low-impedance injectors; injector support chart included in instructions)
- Bosch LSU 4.9 wideband oxygen sensor relays AFR data to the ECU for accurate, precise tuning
- On-board 1-bar MAP sensor suited to naturally aspirated or nitrous combinations; for 2+ bar boosted applications, Holley recommends GM sensor 12592525 with adapter part number 558-416
- MAP sensor vacuum hose adapters (1/8in, 1/4in, and 3/16in) included
- 4 programmable inputs (12V, ground, 5V, frequency) for pressure sensors, nitrous activation triggers, or a trans-brake
- 4 programmable outputs (ground, PWM) for fans, boost control, nitrous control, idle air control, and more
- Boost control strategies: boost vs. time, boost vs. gear, boost vs. RPM, boost vs. speed, plus boost safeties
- Nitrous control: single channel, wet or dry, progressive or non-progressive, with rich/lean safeties and closed-loop AFR targeting
- Advanced programmable tables: four 1D tables, one 1D per-gear table, four 2D tables, and one 2D per-gear table for custom uses such as a flex-fuel sensor offset table or a fuel/oil pressure safety
- On-board diagnostic LEDs for ECU power, engine run, wideband status, TPS calibration, crank signal, and cam signal
- Included 3.5in touchscreen handheld provides a calibration wizard for quick base-tune setup, internal data logging, and a customizable gauge display
- Compact ECU can be mounted virtually anywhere, provided the diagnostic LEDs face up
- Plug-and-play compatible with Holley EFI gauges, shift lights, and digital/Pro Dash displays (Holley part numbers 553-106, 553-111, and 553-112)
- Free EFI tuning software included for full laptop-based control
- Recommended electronic throttle pedal: part number 10379038
Specifications:
- Product Type: EFI System (Terminator X Max)
- Ignition Type: GM LS 58x
- Crank Reluctor: 58x, 4x cam
- Injector Connector: USCAR (EV6)
- Drive-By-Wire: Yes
- Transmission Control: 4L60E/4L80E
- Handheld Included: Yes, 3.5in touchscreen
- MAP Sensor: 1 Bar (2+ bar via GM 12592525 + adapter 558-416)
- Includes: 58x/4x LS main harness, EV6 injector harness, drive-by-wire throttle body harness, 4L60E/4L80E transmission control harness, ECU, ECU main power harness, Bosch LSU 4.9 wideband O2 sensor, I/O harness
- Part Number: 550-928
Not recommended for 4x4 applications with electronic transfer cases, and not compatible with 4L6X transmissions from model year 1995 or earlier due to differences in converter lockup and downshift strategy. Not recommended for marine use, though it can be installed in off-road applications if mounted in a dry, heat-protected location.
FAQ
What does the Terminator X Max add over the standard Terminator X?
4L60E/4L80E automatic transmission control and drive-by-wire throttle body control, plus a 3.5in touchscreen handheld for tuning, data logging, and gauge display.
Will this work with a 4x4 truck that has an electronic transfer case?
No, Holley does not recommend the Terminator X Max for 4x4 applications with electronic transfer cases.
Is this compatible with older 4L60E/4L80E transmissions?
No. It's not compatible with 4L6X transmissions from model year 1995 or earlier, due to year-by-year differences in converter lockup and downshift strategy.
Can this ECU be used in a marine application?
Holley does not recommend it for marine use, though it can be used in off-road applications if mounted in a dry location away from heat.
What if my build needs more boost than the stock 1-bar MAP sensor supports?
Holley recommends the GM 12592525 MAP sensor paired with adapter part number 558-416 for 2+ bar boosted applications.
What electronic throttle pedal does Holley recommend for this kit?
Part number 10379038.
