Haltech NEXUS S2 (ECU Only)
Haltech NEXUS S2 (ECU Only)
The Haltech Nexus S2 is a standalone ECU for 4-cylinder and 2-rotor engines. It replaces the popular Elite 1500. It keeps everything the Elite 1500 did and adds the faster processor, onboard wideband controller, Wi-Fi and high-speed data logging of the Nexus platform.
If you're building a turbo Honda K or B-series, an SR20, a 4G63, an EJ, a 13B rotary or any other 4-cylinder or 2-rotor setup, the S2 gives you full engine control and pro-level race features in one compact unit.
Why choose the Nexus S2?
- Built-in wideband controller: works with NTK and Bosch LSU 4.9 sensors, so you don't need a separate wideband box.
- Onboard 4 bar MAP sensor: covers most boosted 4-cylinder builds without an external sensor.
- 128MB onboard data logging: logs up to 300 channels at up to 1ms (1kHz) for real tuning and diagnostics.
- Wi-Fi and USB-C: tune with NSP (Nexus Software Programmer), and works with the Haltech Connect App.
- Dual CAN ports with switchable termination for Haltech dashes, keypads, wideband controllers and expansion modules.
Key features
- 4D closed-loop boost control and closed-loop CO2 boost control
- Launch control, traction control, anti-lag, rolling anti-lag and rotational idle
- Flat shift control, trans brake control and a race timer
- Flex fuel support and long-term fuel learning (up to 4D)
- Dual knock control and multi-level engine protection
- 6-stage nitrous control
- Variable cam control (up to 4 cams) and dual drive-by-wire throttle
- Stepper motor idle control, intake air bleed control and multi-stage fuel injection
- Advanced torque management (driveshaft and engine RPM targeting)
- Shock travel and ride height monitoring
- Automatic transmission control: Ford AODE/4R70W, GM 4L60E, GM 4L80E, Toyota A340E, Lenco and Liberty
Specifications
| Engine support | Up to 4 cylinders or 2 rotors |
| Injector outputs | 4 x peak and hold (can also be used as low side drive outputs) |
| Ignition outputs | 4 x low current (can also be used as low side drive outputs) |
| Digital pulsed outputs (DPO) | 6 x low side drive, PWM capable |
| Half bridge outputs | 4 x 8A push-pull, PWM capable (e.g. electronic throttle) |
| Engine control relay output | 1 |
| Analog voltage inputs | 11 x 0-5V, with redundancy for electronic throttle and switchable 5V pullup |
| Engine position inputs | Trigger and home, differential, with adjustable thresholds and glitch filters |
| Synchronized pulsed inputs | 6 (cam, frequency or 0-5V analog) |
| Knock sensor inputs | 2 |
| Wideband controller | 1 x onboard, NTK / LSU 4.9 |
| MAP sensor | Internal, 4 bar |
| CAN bus networks | 2, switchable termination |
| Data logging | 128MB, up to 300 channels, up to 1kHz |
| Connectivity | USB-C (low power-up via cable), Wi-Fi |
| Tuning table resolution | 32 x 32 x 8 (4D) |
| On-board PDM / G-sensor | No / No |
What's in the box
- 1 x Haltech Nexus S2 ECU (HT-212000)
- 4 x mounting bolts
- USB-C cable
- USB-C dust cap
- Quick Start Guide
- Wiring diagram
This is the ECU only. The wiring harness, wideband sensor and engine sensors are sold separately. Haltech also sells the S2 as a kit with a universal wiring harness.
Compatibility
Fits engines with up to 4 cylinders or up to 2 rotors, and race builds that need advanced race features and data logging. It's a universal wire-in ECU. Check your trigger setup, injectors, ignition, throttle and cam control needs against the specs above before you buy. If you're not sure, contact us.
Haltech setup and remote tuning from Kugan Tuning
We can help you set up the S2 for your engine, build a startup base map, and tune it remotely with datalog reviews. Send us your engine combination and goals, and we'll make sure the S2 is the right ECU for your build.
Haltech products are designed and sold for sanctioned off-road/competition, non-emissions-controlled vehicles only. Check your local laws before installing.