How to Install APEX’i S-AFC on a JB-JL Engine
The APEX’i S-AFC is a budget-friendly piggyback ECU that helps you fine-tune your fuel delivery. If you’re modifying a Daihatsu Mira L500 with the JB-JL engine, this device gives you solid control over air-fuel ratios for improved performance and fuel efficiency.
Many JB-JL engine users want more power without breaking the bank. The S-AFC is the ideal solution. Let’s dive into what it does and how to install it.
What Is APEX’i S-AFC?
The APEX’i S-AFC (Super Air Flow Converter) works by altering the signal between your air flow meter and your ECU. The air flow meter tells your car’s ECU how much air is entering the engine. The ECU then calculates how much fuel to inject, assuming the engine is stock.
However, once you modify your engine, it may need more or less fuel at specific RPMs. That’s where the S-AFC shines. It tricks the ECU by modifying the air flow signal. For example, you can tell the ECU that more air is coming in at 3000 RPM, and it will inject more fuel. Or reduce it at higher RPMs to lean out the mixture.
Why Use APEX’i S-AFC on JB-JL?
The JB-JL engine is compact, efficient, and highly tunable. If you’ve installed performance mods—like high-flow filters, exhaust systems, or a turbo—the stock ECU might not adjust fuel delivery properly.
With it, you can:
- Correct air-fuel ratios
- Improve throttle response
- Increase fuel efficiency
- Reduce engine knock
Plus, it’s cheaper than standalone ECUs and easier to install.
Wiring the APEX’i S-AFC
I won’t go step-by-step on tapping wires—you should already be confident with basic automotive wiring. Instead, here are the essential JB-JL ECU pinouts you need:
APEX’i S-AFC Pinouts:
- Ground
- IG Power
- Pressure Signal
- RPM Signal
- Knock Signal (optional but useful)
For APEX’i Turbo Timer AFR Wiring:
- Ground
- O2 Sensor
Use a multimeter to double-check the wiring before you connect. Once installed, you can fine-tune your fuel map based on RPM and throttle position.
Final Thoughts
The APEX’i S-AFC is one of the best beginner-friendly tuning tools for your JB-JL engine. It bridges the gap between affordability and real tuning control. With careful tuning, you’ll enjoy better performance, smoother acceleration, and improved fuel economy.
Ready to take control of your Mira L500’s performance? Try the APEX’i S-AFC and unleash the potential of your JB-JL engine.
