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 550
Suitable 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