Fuelino Proto3 first test on motorcycle Honda CBR125R

I waited for this moment for a long time. After designing, manufacturing, soldering and mounting the Fuelino Proto3 board, today I finally tested on my motorcycle (Honda CBR125R).

At first, let me introduce this board very quickly. Fuelino project was born just 3 months ago. I was trying to design a piggyback ECU, which can be mounted on 1/2 cylinder motorcycles, capable of customizing the fuel injection command, and also acquiring (logging) data on a Micro SD card. This is the result. I fixed the board, which is just 5cm x 5cm, into a plastic enclosure, and manually made the wiring harness to connect it on my Honda CBR125R.

I also added the optional "Micro SD module" by Catalex.

This is how the box looks like after mounting the Micro SD module, which is connected to Fuelino (Arduino Nano) via SPI communication protocol.

My Honda CBR125R has customized cables, under the seat, as visible below. I created them to simplify the testing.

  • One connector (2 pins) comes from the original ECU, and it has "+12V" and "injector command signal".
  • One connector (2 pins) comes from the original injector, and it has "+" and "-". The "+" should be connected to "12V", and the "-" should be connected to the command coming out from Fuelino.
  • One connector (1 pin) coming from the chassis (it corresponds to Ground, 0V).
  • One connector (1 pin) for Throttle signal.

Fuelino Proto3 is installed under the seat. This is the best place, in my opinion, since it is not so hot, and also it is protected by rain.

Finally, the next video shows the behavior of Fuelino Proto3 in "engine idling" conditions, about 2000rpm (the engine was cold). I am sorry, the video is very short, and since there are many houses around here, I could not run the engine for a long time. In the next days, I will update more videos, including data logs obtained with the Micro SD card.

Author: Davide Cavaliere

I am an Italian Electrical Engineer graduated at Politecnico di Milano. My interests are motorcycles and cars, electronics, programming, Internet of Things, and Japanese culture.

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