Nexus Integration for the Classic Roadster: Adaptor Harness for NA Miata
The Nexus S2/S3 Plug ‘n’ Play Adapter Harness is the gateway to installing Haltech’s advanced Nexus series VCUs into the Mazda MX-5 NA (1990-1995). This harness bridges the gap between the classic NA chassis and the cutting-edge Nexus S2 or S3, allowing for unprecedented control over the B6 and BP engines. It eliminates the need for custom wiring, providing a direct interface between the factory loom and the VCU.
Engineering for the Nexus Platform
This harness maps the NA’s specific pinout to the Nexus inputs/outputs. It supports the factory CAS and idle control systems, ensuring the engine runs smoothly. The harness includes an auxiliary I/O connector for adding aftermarket sensors like wideband O2, fuel pressure, and oil pressure, which the Nexus VCU can log and use for engine protection. The kit includes an air temp sensor for Speed Density conversion.
Operational Benefits
By upgrading to a Nexus VCU with this harness, NA owners gain access to features like Wi-Fi connectivity, high-speed data logging, and advanced motorsport functions (launch control, traction control). The installation is clean and reversible, preserving the factory wiring. Whether using the S2 or S3, the result is a thoroughly modernized engine management system that unlocks the true potential of the Miata platform.
Fitment Guide
- Mazda MX-5 Miata: NA 1.6L & 1.8L (1990-1995)
- Transmission: Manual Only
Technical Specifications
| Parameter | Specification |
|---|---|
| Supported VCU | Nexus S2 or Nexus S3 |
| Connector Type | Factory 2-Plug Header |
| Transmission | Manual Only |
| TPS Note | 1.6L requires VTPS upgrade |
Summary & Includes
Includes:
- 1 x Injection Molded Plug ‘n’ Play Adaptor Harness
- 1 x M14 x 1.5 Air Temp Sensor with matching plug and pins
- 1 x Auxiliary I/O 16 Pin Tyco plug and pins
Note: Manual transmission only. Not for OBDII models. TPS upgrade mandatory for 1.6L.
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