HOLLEY EFI 550-927T sku-722625135 090127074572 ECU

HOLLEY EFI 550-927T is a Terminator X Max kit in Performance Fuel, Carburetors and Intakes, listed as sku-722625135, UPC 090127074572. It is for GM LS 4.8/5.3/6.0 truck engines with a 24x crank reluctor, Multec 2 injectors, drive-by-wire throttle body control and transmission control. Real-time fuel-map learning adjusts the base fuel table.

Its high-impedance drivers support most stock LS and Holley EFI injectors, but not low-impedance injectors. A Bosch LSU 4.9 wideband sensor supplies AFR readings to the ECU. The onboard 1bar MAP sensor suits naturally aspirated or nitrous setups; for setups requiring 2+Bar, the source recommends GM 12592525 with adapter 558-416. MAP vacuum-hose adapters are listed in 1/8, 1/4 and 3/16 sizes.

There are 4 inputs for 12v, ground, 5v and frequency, and 4 outputs for accessories. The kit supports boost control, single-channel wet or dry nitrous control, diagnostic LEDs and custom tables, including 4x 1D, 1x 1D per gear, 4x 2D and 1x 2D per gear.

Configuration uses an included CAN/USB cable and free tuning software; the source also describes adjustments through a 3.5 touchscreen, while the title specifies a kit without the handheld. The ECU's diagnostic LEDs must face up when mounted. The source mentions planned 12.3" digital-dash support and recommends pedal part 10379038.

Included are the LS engine main harness, Multec 2 injector harness, DBW throttle-body harness, 4L60E/4L80E transmission-control harness, Terminator X MAX ECU, ECU main-power harness, Bosch LSU 4.9 wideband oxygen sensor and input/output harness.