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Haltech Usage Policy:
In many states, it is unlawful to tamper with your vehicle's emissions equipment. Haltech products are designed and sold for sanctioned off-road/competition non-emissions controlled vehicles only and may never be used on a public road or highway. Using Haltech products for street/road use on public roads or highways is prohibited by law unless a specific regulatory exemption exists (more information can be found on the SEMA Action Network website www.semasan.com/emissions for state by state details in the USA). It is the responsibility of the installer and/or user of this product to ensure compliance with all applicable local and federal laws and regulations. Please check with your local vehicle authority before purchasing, using or installing any Haltech product.
Haltech makes ECUs to suit a wide range of engines and applications, so sometimes working out which ECU is right for you can be a tricky process. Here are a few simple hints to help you choose the correct ECU for your application.
KNOW YOUR WIRING
Haltech ECUs are split into two major groups; Plug’n’Play and Universal. If you are planning to use the factory harness, then take a look at our Plug’n’Play ECU solutions. These include the Nexus Plug-in ECUs that connect directly to your factory harness, or the Nexus S2 and S3 range of ECUs that connect to the factory harness via adaptor harnesses.
If you’re planning to rewire your car completely, do an engine swap, or build a race car from the ground up, there are three ways to get there:
Nexus Rebel: a Rebel ECU paired with a terminated harness kit for a specific popular engine. The fastest path from box to running car, with the wiring already done for you.
Terminated Engine Harness Kits: a harness terminated for your specific engine platform (Ford Barra, GM LS1/LS6, LS2/LS3, Mazda 13B, Nissan RB, Toyota 2JZ, and more). Less wiring work than a fully universal harness, with more flexibility and function support than Nexus Rebel.
Universal Wiring Kits: pair any Universal ECU with a fully universal, unterminated harness. Built for total wiring flexibility: engine swaps, oddball combinations, or from-scratch builds where no terminated option exists.
As their name suggests, Universal ECUs will work with almost all engine types and configurations across any of these three wiring paths. The latest Nexus Series VCUs go one step further and include an on-board Power Distribution Module, making the wiring process quicker, easier and safer!
KNOW YOUR ENGINE
Your engine’s requirements will dictate the features you’ll need from your ECU. The number of inputs and outputs required will quickly narrow down your selection. Some ECUs are more suited for 4 or 6-cylinder engines, while V8s or V12s will in most cases require the ECUs in the upper end of the range.
Next, look at your engine’s specific requirements like Engine Protection, Drive-By-Wire throttle, Flex Fuel, Knock Control, Long Term Learning, Launch/Traction Control or Variable Cam Control. Adding these to your list will further refine your choices.
KNOW YOUR GOALS
If you’re building a race car, then you’ll no doubt be needing functions that will allow you to go faster, quicker and stay reliable. Look for “Race Functions” like Boost Control, Nitrous Control, Flat Shift, Trans Brake or Torque Management which have been specifically designed for competitive racing.
The comparison tables below will help you decide which ECU has the features, functions, inputs and outputs best suited to your vehicle.
Haltech Universal ECU Comparison Chart
Outputs
Elite 550
Elite 750
Nexus T1
Nexus T2
Elite 1500
Elite 2500/T
Nexus S2
Nexus S3
Nexus R3
Nexus R5
Injection
4 (peak and hold)
6 (peak and hold)
4 (peak and hold)
6 (peak and hold)
4 (peak and hold)
8 (peak and hold)
4 (peak and hold)
8 (peak and hold)
8 (peak and hold)
18 (peak and hold)
Ignition
4
6
4
6
4
8
4
8
8
12
Total Digital Pulsed Outputs (DPO)
5
5
5
5
5
5
6
6
6
8
Half Bridge Outputs (HBO)
0
0
0
0
4 Stepper 2 DBW
4 Stepper 2 DBW
4 8A
4 8A
6 8A
4 8A
25A High Current Outputs (HCO)
0
0
0
0
0
0
0
0
4
4
Engine Control Relay output
0
0
0
0
1
1
1
1
0
0
Inputs
Elite 550
Elite 750
Nexus T1
Nexus T2
Elite 1500
Elite 2500/T
Nexus S2
Nexus S3
Nexus R3
Nexus R5
MAP sensor
Internal (4 BAR)
Internal (4 BAR)
Internal (4 BAR)
Internal (4 BAR)
Internal (4 BAR)
Internal (4 BAR)
Internal (4 BAR)
Internal (4 BAR)
Internal (4 BAR)
External
Analog Voltage Inputs (AVI)
1
2
5
5
10
10
11
11
11
23
Differential Engine Position Inputs
2 (Trigger and Home)
2 (Trigger and Home)
2 (Trigger and Home)
2 (Trigger and Home)
2 (Trigger and Home)
2 (Trigger and Home)
2 (Trigger and Home)
2 (Trigger and Home)
2 (Trigger and Home)
2 (Trigger and Home)
Synchronized Pulsed Inputs (SPI)
0
0
2 (1 shared w/ Knock)
2 (1 shared w/ Knock)
4
4
6
6
6
10
Digital Pulsed Inputs (DPI)
1
2
0
0
0
0
0
0
0
0
Knock Inputs
0
0
1
1
1
2
2
2
2
2
Onboard Wideband Controller
NO
NO
NO
NO
NO
NO
1 x NTK/LSU 4.9
1 x NTK/LSU 4.9
1 x NTK/LSU 4.9
2 x NTK/LSU 4.9
Ignition Switch Input
1
1
1
1
1
1
1
1
1
1
Comms
Elite 550
Elite 750
Nexus T1
Nexus T2
Elite 1500
Elite 2500/T
Nexus S2
Nexus S3
Nexus R3
Nexus R5
CAN Bus Networks
1
1
1
1
2
2
2
2
2
3
USB 2.0 Comms Cable
USB-B
USB-B
USB-C
USB-C
USB-B
USB-B
USB-C
USB-C
USB-C
USB-C
Low Power Up via Cable
NO
NO
YES
YES
NO
NO
YES
YES
YES
YES
WiFi
NO
NO
YES Internal Antenna
YES Internal Antenna
NO
NO
YES Internal Antenna
YES Internal Antenna
YES External Antenna
YES External Antenna
Compatible with Haltech Connect App
NO
NO
YES
YES
NO
NO
YES
YES
YES
YES
Features
Elite 550
Elite 750
Nexus T1
Nexus T2
Elite 1500
Elite 2500/T
Nexus S2
Nexus S3
Nexus R3
Nexus R5
Drive-By-Wire Throttle
NO
NO
NO
NO
Single
Single
Dual
Dual
Dual
Dual
Flex Fuel
YES
YES
YES
YES
YES
YES
YES
YES
YES
YES
Closed Loop O2 Control
Dual
Dual
Dual
Dual
Dual
Dual
Dual
Dual
Dual
Dual
Knock Control
NO
NO
Single
Single
Single
Dual
Dual
Dual
Dual
Dual
Variable Cam Control
Single
Single
Up to 2
Up to 2
Up to 4
Up to 4
Up to 4
Up to 4
Up to 4
Up to 4
Long Term Learning
Up to 3D
Up to 3D
Up to 4D
Up to 4D
Up to 4D
Up to 4D
Up to 4D
Up to 4D
Up to 4D
Up to 4D
Data Logging
2MB
2MB
32MB
32MB
8MB
8MB
128MB
128MB
128MB
512MB
Traction Control
NO
NO
YES
YES
YES
YES
YES
YES
YES
YES
Tuning Table Resolution
32×16 3D
32×32 3D
32x32x8 4D
32x32x8 4D
32x32x8 4D
32x32x8 4D
32x32x8 4D
32x32x8 4D
32x32x8 4D
32x32x8 4D
Engine Protection
Single Level
Single Level
Multi-Level
Multi-Level
Multi-Level
Multi-Level
Multi-Level
Multi-Level
Multi-Level
Multi-Level
Inertia / G-Sensor
NO
NO
NO
NO
NO
NO
NO
NO
YES
YES
On-Board PDM
NO
NO
NO
NO
NO
NO
NO
NO
YES
YES
Race Functions
Elite 550
Elite 750
Nexus T1
Nexus T2
Elite 1500
Elite 2500/T
Nexus S2
Nexus S3
Nexus R3
Nexus R5
Launch Control
YES
YES
YES
YES
YES
YES
YES
YES
YES
YES
Nitrous Control Stages
1
1
6
6
up to 6
up to 6
up to 6
up to 6
up to 6
up to 6
Boost Control
3D Closed Loop
3D Closed Loop
4D Closed Loop
4D Closed Loop
4D Closed Loop
4D Closed Loop
4D Closed Loop
4D Closed Loop
4D Closed Loop
4D Closed Loop
CO2 Control
NO
NO
YES
YES
YES
YES
YES
YES
YES
YES
Intake Air Bleed Control
NO
NO
YES
YES
YES
YES
YES
YES
YES
YES
Anti-Lag/Rotational Idle
NO
NO
YES
YES
YES
YES
YES
YES
YES
YES
Rolling Anti-Lag
NO
NO
YES
YES
YES
YES
YES
YES
YES
YES
Flat Shift Support
Basic
Basic
Advanced
Advanced
Advanced
Advanced
Advanced
Advanced
Advanced
Advanced
Shock Travel & Ride Height
NO
NO
YES
YES
YES
YES
YES
YES
YES
YES
Trans Brake
NO
NO
YES
YES
YES
YES
YES
YES
YES
YES
Race Timer
NO
NO
YES
YES
YES
YES
YES
YES
YES
YES
Torque Management (Driveshaft and Engine RPM Targeting)
NO
NO
YES
YES
NO
YES (2500T)
YES
YES
YES
YES
STILL UNSURE?
If you’ve narrowed your choice down to a couple of ECUs but want to confirm you’ve made the right decision, contact our tech or sales support. Remember, our goal is not to just sell you any ECU, we want to provide you with an ECU that’s right for YOU.
In many states, it is unlawful to tamper with your vehicle's emissions equipment. Haltech products are designed and sold for sanctioned off-road/competition non-emissions controlled vehicles only and may never be used on a public road or highway. Using Haltech products for street/road use on public roads or highways is prohibited by law unless a specific regulatory exemption exists (more information can be found on the SEMA Action Network website www.semasan.com/emissions for state by state details in the USA). It is the responsibility of the installer and/or user of this product to ensure compliance with all applicable local and federal laws and regulations. Please check with your local vehicle authority before purchasing, using or installing any Haltech product.
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