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DIY: Apex-i S-AFC and Turbo Timer Air Flow Installation Diagram

Want to fine tune your Daihatsu Mira L500 a.k.a JB-JL engine to improve fuel efficiency and performance? Then the Apex'i S-AFC piggyback ECU is the best budget ECU around the modification scene for you. Here is a little explanation of S-AFC. The A'PEXi Air Flow Converters work by intercepting the signal between the car's air flow meter and the ECU. The Air Flow Meter is the device that tells the ECU how much air is entering the engine so that the ECU can add the correct amount of fuel. 

The ECU calculates the proper ratio of fuel to air for a stock, unmodified engine. Certain engine modifications can cause the dynamics of the engine to require more fuel. In this case, there are two common options for modifying the amout of fuel being input into the engine. One can either install larger injectors or increase the fuel pressure to the stock injectors is increased. 

Since the stock ECU thinks that it knows how much fuel it is putting into the engine based on the stock injector size and the stock fuel pressure, changing either of these will result in increased fuel. You may get lucky and just pick the perfect injector or fuel pressure that gives you the perfect air/fuel ratio. You may also get lucky and pick this weekends winning lottery numbers. In either case I wouldn't bet the farm on it. The Air Flow Converter gives you the means to adjust the amount of fuel that the ECU injects into the engine by modifying the signal from the air flow meter. This is done a specific RPM levels. This way you can tell the engine that a certain amount more air is flowing into the engine as a specific RPM than is really entering the engine, and the ECU will add that much more fuel. Decrease it at another RPM level and the ECU will decrease the fuel into the engine. 

After reading the full explanation of what is S-AFC, so now is time to install it to your JB-JL engine. I will not explain on how to tap the wires from the S-AFC to the ECU because I believe all of us should have the knowledge of working on wiring. Thus I will just show the ECU pins that you need for the installation. 

For those who wish to install S-AFC, you need to connect the wires to the following pins.
1. Ground 
2. IG Power 
3. Pressure Signal
4. RPM
5. Knocking Signal 

For those who wish to install Apex-i Turbo Timer air fuel ratio, you need to connect the wires to the following pins.
1. Ground 
2. O2 Sensor 

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