Haltech Nexus R3 Barra VCU & Terminated Harness Package
The Haltech Nexus R3 Barra package brings advanced engine management, power distribution, wideband control and high-speed data logging together in one properly integrated system for selected Ford Barra 4.0L engines.
The standard package combines the Haltech Nexus R3 VCU (HT-193000) with the Nexus R3 Ford Barra Terminated Engine Harness (HT-186405). Rather than starting with a universal harness, the terminated Barra harness is designed around the factory engine sensors, electronic throttle, cam control and other commonly retained Barra systems.
This makes the package an excellent foundation for anything from a well-sorted street and performance Barra conversion through to a high-powered drag, roll-racing or circuit application.
Important: The base package does not include the ignition sub-harness, ignition module, ignition module adaptor harness or injector sub-harness. These must be selected separately where required. See the option guide below before ordering.
Standard Package Includes
- 1 x Haltech Nexus R3 Vehicle Control Unit – HT-193000
- 1 x Haltech Nexus R3 Ford Barra Terminated Engine Harness – HT-186405
Nexus R3 VCU components
- Haltech Nexus R3 VCU
- Red and black SurLok power connectors
- Wi-Fi antenna
- VCU mounting bolts
- USB-C communication cable
- USB-C dust cap
Barra terminated harness components
- Main terminated engine harness
- BA/BF accelerator pedal position adaptor harness
- FG accelerator pedal position adaptor harness
- BA/BF electronic throttle adaptor harness
- FG electronic throttle adaptor harness
- Nexus two-pin BA alternator adaptor
- Nexus three-pin BF/FG alternator adaptor
- Cabin adaptor harness
- Opposing connectors and pins for boost control, TMAP, dual intake runner control, spare inputs and outputs, and transmission breakout
Barra Engine Compatibility
The HT-186405 terminated engine harness is designed for the following Ford Barra engines:
- BA Falcon: Barra 240T XR6 Turbo
- BF Falcon and SY Territory: Barra 190 naturally aspirated
- BF Falcon: Barra 245T XR6 Turbo
- FG Falcon: Barra 270T XR6 Turbo
Barra engines and vehicle conversions can vary considerably. If your engine is outside the applications above, has mixed-model sensors, a changed throttle body, modified cam control or a non-standard ignition system, contact Spool Imports before ordering.
How to Select Your Ignition Options
The correct ignition components depend on whether you are retaining the factory Barra coils or converting to Nissan R35-style smart coils.
Retaining BA/BF factory ignition coils
Select all three of the following options:
- BA/BF Ignition Harness – HT-130345
- HPI6 Six-Channel High Power Igniter – HT-020036
- Nexus Six-Cylinder Igniter Adaptor Harness – HT-186069
The BA/BF factory coils require an external ignition module. The HPI6 provides the required six-channel ignition drive, while the HT-186069 adaptor connects the HPI6 to the Nexus terminated harness and compatible ignition sub-harness.
Retaining FG factory ignition coils
Select all three of the following options:
- FG Ignition Harness – HT-130347
- HPI6 Six-Channel High Power Igniter – HT-020036
- Nexus Six-Cylinder Igniter Adaptor Harness – HT-186069
As with the BA/BF arrangement, the factory FG coils require the HPI6 ignition module and the Nexus igniter adaptor harness.
Complete R35 coil conversion
Select:
- Haltech R35 Coil Bracket Kit for Ford Barra – HT-120205
This is the complete conversion option and includes the coil mounting bracket, six R35 ignition coils, connectors and the required ignition harness.
Do not add the HPI6 ignition module or HT-186069 igniter adaptor harness when using the complete HT-120205 R35 coil kit.
R35 ignition harness only
Select:
- Nexus Inline-Six R35 COP Ignition Harness – HT-186063
This option is intended for installations that already have compatible R35 coils and a suitable coil mounting solution. It supplies the ignition harness only; coils and mounting bracket are not included.
Quick ignition guide:
| Ignition setup |
Ignition harness |
HPI6 required? |
Igniter adaptor required? |
| BA/BF factory coils |
HT-130345 |
Yes – HT-020036 |
Yes – HT-186069 |
| FG factory coils |
HT-130347 |
Yes – HT-020036 |
Yes – HT-186069 |
| Complete R35 conversion |
Included with HT-120205 |
No |
No |
| Existing R35 coils and bracket |
HT-186063 |
No |
No |
Injector Harness Options
The main Barra terminated harness requires an injector sub-harness suited to the electrical connector fitted to your injectors. Select the connector type—not the injector brand or advertised flow rate.
- EV1/Timer Primary Injector Harness – HT-186004: For six injectors using traditional Bosch EV1/Jetronic-style connectors.
- GT150/USCAR EV6 Primary Injector Harness – HT-186007: For six injectors using compact USCAR/EV6-style connectors.
- Sumitomo/Denso Primary Injector Harness – HT-186010: For six injectors using compatible Sumitomo/Denso-style connectors.
Each harness connects six injectors to the injector breakout connector on the main terminated harness. The individual injector connectors are labelled to make cylinder identification and installation more straightforward.
If you are unsure which connector your injectors use, compare the connector carefully or contact Spool Imports with the injector brand and part number before ordering.
Why Choose the Nexus R3 for a Barra?
The Nexus R3 is more than a conventional standalone ECU. Haltech combines engine management, power distribution, wideband lambda control and data logging into a single Vehicle Control Unit.
For a performance Barra installation, that integration can reduce the number of separate control modules and relays required while providing the advanced tuning, protection and motorsport functions expected from a modern Haltech system.
Key Nexus R3 hardware
- Eight peak-and-hold injector drivers
- Eight ignition outputs
- Four 25-amp continuous high-current outputs
- Six low-side digital pulsed outputs
- Six 8-amp push-pull/H-bridge outputs
- Eleven 0–5V analogue voltage inputs
- Six synchronised pulsed inputs
- Trigger and home differential engine position inputs
- Two knock sensor inputs
- Onboard Bosch LSU 4.9 or NTK wideband controller
- Onboard 4-bar MAP sensor
- Two CAN networks with switchable termination
- Onboard Wi-Fi and USB-C connectivity
- 128MB onboard data logging memory
- Logging of up to 300 channels at sample rates up to 1kHz
- Integrated G-sensor
Advanced tuning and motorsport functions
- Up to four-sensor variable cam control
- Dual electronic throttle control
- Long-term fuel learning
- 4D closed-loop boost control
- Closed-loop CO2 boost control
- Dual knock control
- Multi-stage injection
- Multi-level engine protection
- Launch control
- Traction control
- Rolling anti-lag and rotational idle
- Transbrake control
- Advanced torque management
- Up to six stages of nitrous control
- Flat-shift control
- Race timer functions
- Shock travel and ride-height monitoring
Supported Factory Barra Functions
When used with the correct engine and installation components, the terminated harness supports:
- Factory crank sensor
- Intake and exhaust cam position sensors
- Intake and exhaust variable cam timing solenoids
- BA, BF and FG electronic throttle and accelerator pedal
- Dual intake runner system, also known as the broadband manifold system
- BA, BF and FG ignition coils with the appropriate optional components
- Factory four-pin TMAP sensor
- Air-conditioning clutch and pressure switch
- Two-pin and three-pin alternator arrangements
- Factory knock sensors
Additional Performance Functions Supported
The harness and Nexus R3 can also support a wide range of aftermarket components. Additional sensors, actuators, wiring or calibration may be required.
- Bosch LSU 4.9 wideband oxygen sensor
- Flex-fuel sensor
- Onboard 4-bar MAP sensing
- Oil pressure and fuel pressure sensors
- Thermo fan control
- Fuel pump control
- Haltech boost-control solenoid
- Haltech CAN devices including digital dashes, keypads and IO16 expanders
- Spare inputs and outputs for additional vehicle functions
Important Installation Information
- This package requires installation, configuration and tuning by a suitably experienced technician.
- A terminated engine harness substantially reduces engine-side wiring work, but it does not make every Barra conversion completely plug-and-play.
- Vehicle-side wiring, power supply, grounding, fuel-system control and installation of optional accessories may still be required.
- A compatible wideband oxygen sensor is required to use the Nexus R3 onboard wideband controller.
- Injector and ignition options must match the physical components fitted to the engine.
- Confirm compatibility before ordering if your engine uses components from more than one Barra generation.
Frequently Asked Questions
What is included in the standard Haltech Nexus R3 Barra package?
The standard package includes the Haltech Nexus R3 VCU, part number HT-193000, and the Nexus R3 Ford Barra Terminated Engine Harness, part number HT-186405. Ignition and injector sub-harness components are selected separately.
Does this package include an injector harness?
No. Select the injector harness that matches the connectors fitted to your injectors: EV1/Timer, GT150/USCAR EV6 or Sumitomo/Denso.
Can I use the factory BA or BF Barra ignition coils?
Yes. You will require the BA/BF ignition harness HT-130345, the HPI6 high-power igniter HT-020036 and the Nexus six-cylinder igniter adaptor harness HT-186069.
Can I use the factory FG Barra ignition coils?
Yes. You will require the FG ignition harness HT-130347, the HPI6 high-power igniter HT-020036 and the Nexus six-cylinder igniter adaptor harness HT-186069.
Do I need an HPI6 when converting to R35 coils?
No. The R35-style coils used with the Haltech conversion are smart coils and do not require the external HPI6 ignition module. Select either the complete HT-120205 conversion kit or the HT-186063 harness-only option if compatible coils and a mounting bracket are already installed.
What is included with the HT-120205 R35 coil conversion?
The complete Haltech HT-120205 Barra R35 conversion includes the coil mounting bracket, six R35 ignition coils, connectors and the required ignition harness.
Does the terminated harness make the installation completely plug-and-play?
No. It greatly reduces engine-side wiring, but vehicle-side power, grounding, fuel-system control and other conversion wiring may still be required. The VCU must also be configured and professionally tuned.
Does the Nexus R3 have a built-in MAP sensor?
Yes. The Nexus R3 has an onboard 4-bar MAP sensor. The installation must still provide a suitable pressure reference to the VCU.
Does the Nexus R3 have built-in wideband control?
Yes. It has one onboard wideband controller supporting Bosch LSU 4.9 and compatible NTK sensors. The wideband oxygen sensor itself is not included in the standard package.
Can the Nexus R3 control electronic throttle and variable cam timing?
Yes. The Nexus R3 and Barra terminated harness support the applicable BA, BF and FG electronic throttle arrangements, along with intake and exhaust variable cam control on supported engines.
Can this package operate a factory automatic transmission?
The Nexus R3 supports several electronically controlled transmissions, but the suitability of a particular Barra transmission and vehicle combination must be confirmed separately. Additional wiring, interfaces or transmission control hardware may be required.
Is professional tuning required?
Yes. The Nexus R3 must be configured and tuned for the individual engine, injectors, fuel system, ignition components, sensors and vehicle application before the engine is operated under load.
