Haltech Elite 550 ECU Compact Standalone Engine Management for 4 to 8 Cylinder Engines The Haltech Elite 550 ECU is a compact, cost-effective standalone ECU designed for basic 4 to 8-cylinder and 1 to 2-rotor engine configurations. Whether you're running a naturally aspirated or turbocharged setup, the Elite 550 gives you precise control over fuel injection, ignition timing, and boost pressure—making it the perfect entry-level solution for street or performance builds. Housed in a rugged IP67-rated waterproof case, the Elite 550 is built to withstand the toughest conditions. It comes equipped with 4 fuel and 4 ignition outputs, plus a powerful internal 4 Bar MAP sensor capable of monitoring up to 45 PSI of boost. Now compatible with Haltech’s Nexus Software Programmer (NSP), this ECU delivers intuitive calibration and advanced functionality, bringing cutting-edge engine management capabilities to tuners and motorsport enthusiasts worldwide. Key Features: Supports 1 to 8 cylinder engines and 1 to 2 rotor engines Suitable for naturally aspirated or forced induction setups Advanced load sensing via TPS, MAP, or MAF sensors Compatible with sequential, semi-sequential, batch, or multipoint fuel injection systems Multiple ignition modes: Direct fire (multi-coil), Distributor, or Haltech CDI Waterproof (IP67-rated) with 34-pin AMP connector for maximum durability Built-in 4 Bar internal MAP sensor (supports up to 45 PSI/300kPa of boost) Seamless CAN integration with Haltech digital dashes and expansion modules USB laptop communication (Windows) Input/Output & Expansion: 4 x Peak & Hold Fuel Injection Outputs (0-8A peak / 0-2A hold) 4 x Ignition Outputs 2 x Dedicated Engine Position Inputs with extensive trigger type support 1 x Digital Pulsed Input 5 x Digital Outputs 1 x Analog Voltage Input 3 x Dedicated Sensor Inputs: TPS, Coolant Temp, and Air Temp Up to 33 I/O expansion channels via CAN Whether you're building a budget turbo street car or tuning a mild performance engine, the Elite 550 ECU provides reliable and powerful control without the complexity of higher-tier ECUs. ECU FUNCTIONS O2 Control - Closed Loop with Long Term Learning - for precise tuning (With optional external CAN O2 Wideband Controller Kit). Boost Control - Closed loop with learning with flexible user-definable axis and 6 fully user-definable corrections modes - for example, boost by gear, road speed etc. Flex Fuel Function (Direct sensor input) - Tune your engine's boost, fuel and ignition by ethanol content Low Impedance Injector control with Programmable Injector Peak and Hold Currents Closed Loop Idle Speed Control - requires 1 or 2 user-defined outputs (BAC type) On-board and Laptop data logging - Data log all available channels directly to your laptop's hard drive for both tuning and diagnostics CAN Bus communication for Haltech Dashes and expansion devices or OBDII (view live engine data and set and clear diagnostic trouble codes) 2 Injection Stages for use with Rotary Engines ECU comes fully enabled, with no additional charges for advanced features. ADVANCED TUNING Tuning Table Resolution up to 32 x 16 Limitless tuning flexibility -Tune your engine by a combination of 3D tuning tables combined with 3D per cylinder compensations and multiple user-definable corrections Tune by a combination of manifold pressure, throttle position, cam position, ethanol content, gear, road speed, race time, EGT, shock travel, ride height or any channel for ultimate flexibility - Dual mapping is a thing of the past. Per Cylinder Tuning Correction - 3D Wideband O2 - Connect up to 3 Channels via CAN expansion devices Thermocouples / EGT (Exhaust Gas Temperature) - Connect up to 12 Channels via external CAN expansion devices Variable cam control - Independently control up to 2 camshafts - Requires a minimum of 1 user-defined input and output per variable cam What's Included: Elite 550 ECU Waterproof USB Cap USB Programming Cable Info: Brand: Haltech Model: Elite 550Suitable for: Universal 1-8 cylinder or 2 rotor applications Warranty: 12 Months Note: Haltech's entry level, single connector ECU. Ideal for basic 4 cylinder or 2 rotor engine applications and basic EFI conversions. Resources: Quickstart Guide Spec Sheet Wiring Diagram (Basic Harness) Wiring Diagram (Premium Harness) Dimensions & Mounting Diagram
