High-Energy Ignition Upgrade for FC RX-7s
The Elite 1500 Terminated Harness for Mazda 13B S4/5 with IGN-1A brings modern, high-energy ignition capabilities to the classic FC RX-7 platform. Designed for Series 4 and 5 engines using the older style CAS, this harness is specifically terminated to accept IGN-1A Smart Coils. This is a massive upgrade over the factory coil setup, providing the spark energy needed to reliably ignite high-boost methanol or ethanol mixtures. Combined with Bosch EV1 injector connectors, this harness lays the foundation for a serious performance build.
Engineering Deep-Dive: Retrofitting Modern Tech
The S4/5 13B originally came with a complex coil pack and igniter system that is now prone to failure. By converting to IGN-1A coils, you eliminate the external igniter and gain individual cylinder control. This harness handles the conversion wiring for you. It routes the logic triggers from the Elite 1500 directly to the smart coils, along with the high-current power and ground feeds they require. The harness retains the correct plug for the S4/5 CAS, ensuring seamless integration with the engine’s trigger system.
Operational Benefits: Consistency and Power
With this harness, you eliminate the “break-up” often experienced at high RPM with stock rotary ignition systems. The fuse block ensures that the coils and injectors have a dedicated, protected power supply, independent of the aging chassis wiring. This results in smoother idle, easier starting, and the ability to tune for maximum power without ignition limitations.
Fitment and Application Scope
Suits:
- Mazda RX-7 FC3S (Series 4 and 5 13B).
- Ignition: Terminated for IGN-1A Coils.
- Injectors: Bosch EV1 Connectors.
Technical Specifications
| Parameter | Specification |
|---|---|
| ECU Compatibility | Haltech Elite 1500 |
| Engine Platform | Mazda 13B S4/S5 |
| Coil Connector | IGN-1A (5-pin) |
| Injector Connector | Bosch EV1 |
| Power | Integrated Fuse Block |
Summary & Includes
The HT-140878 modernizes the FC ignition system for race-winning performance. Essential for high-boost applications.
Includes:
- 1 x Engine Harness with Fuse Block
- 1 x Pre-wired IGN-1A Ignition Harness
- 1 x Firewall Grommet
Requirement: You must use IGN-1A coils (HT-020114). Stock coils will not plug into this harness.
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