Holley EFI Terminator X Max – Gen IV 4.8/5.3/6.0 GM Truck Engines and LS2/LS3

Holley EFI Terminator X Max – Gen IV 4.8/5.3/6.0 GM Truck Engines and LS2/LS3

The Holley EFI Terminator X Max – Gen IV 4.8/5.3/6.0 GM Truck Engines and LS2/LS3 is a powerful, user-tuneable engine management system designed specifically for GM LS engines with 58x crank and 4x cam sensors, including Drive-By-Wire throttle body control. It delivers advanced self-learning fuel strategies, boost and nitrous control, and precise ignition timing for street and race applications, all packed into a compact, budget-friendly ECU with a 3.5″ touchscreen handheld for easy tuning and monitoring.

Key Features

• Designed for GM 4.8/5.3/6.0 LS Truck Engines and LS2/LS3 with 58x crank, 4x cam, and Drive-By-Wire throttle body
• Real-time fuel map learning for fast, accurate base tuning
• High impedance injector drivers compatible with stock and Holley EFI injectors (EV6)
• Integrated 1bar MAP sensor ideal for naturally aspirated and nitrous setups
• 4 programmable inputs and outputs for accessories, boost, and nitrous control
• Advanced boost control with multiple trigger options and safeties
• Progressive wet and dry nitrous control with rich/lean safeties and closed-loop AFR targeting
• On-board Bosch LSU 4.9 wideband oxygen sensor for precise AFR monitoring
• 3.5″ touchscreen handheld with calibration wizard, data logging, and customizable gauges
• Compact ECU size for flexible mounting; diagnostic LEDs for quick troubleshooting
• Free Holley EFI software for laptop tuning and advanced control
• Plug-and-play compatibility with Holley EFI accessories and digital dash modules

Fitment

• GM Gen IV 4.8L, 5.3L, and 6.0L LS Truck engines
• LS2 and LS3 engines with 58x crank and 4x cam sensors
• Engines equipped with Drive-By-Wire throttle bodies and EV6 injectors

Note: Verify compatibility with your engine and components before ordering. Installation requires basic tuning knowledge. Recommended pedal assembly part number 10379038. ECU mounting should allow diagnostic LEDs to face upward for proper status indication.