Rywire Mazda RX7 FD3S 13B Mil-Spec Engine Harness w/Denso Primary & Secondary Plugs

If you're rebuilding the engine in your Mazda RX7 FD3S with the 13B rotary engine, getting the wiring sorted is a critical step. This Mil-Spec engine harness from Rywire is built to handle the demands of a performance rotary setup, ensuring your engine gets the clean, reliable electrical signals it needs to run smoothly. It's designed specifically for the FD3S chassis and the 13B engine, using high-quality components to replace or upgrade your factory wiring.

Rywire uses Mil-Spec connectors and wire, which are known for their durability and resistance to vibration and harsh conditions. This means you can expect a harness that's not only functional but also built to last, even in a high-performance application. The harness comes equipped with Denso primary and secondary injector plugs, making it a direct fit for many common injector setups on the 13B-REW engine. It’s a well-built piece that takes the guesswork out of a complex part of the engine swap or rebuild process.

Keep in mind that this harness requires the Rywire RX7 FD3S 13B Sub-Harness (part RY-13B-SUB-FD) to complete the installation, as it handles the main engine connections. Having a solid, reliable wiring harness is essential for proper engine function, from ignition timing to fuel delivery. This Rywire harness offers a robust solution for FD3S owners looking for a dependable electrical system.