Fuelino on a Ducati Monster 797

Ducati Monster 797 Plus Chiba Japan

Hello again to everyone. I haven't written any posts for a long time, but today I come up again with a very exciting news about Fuelino project. As some people might know, I have sadly sold my Honda CBR125R and bought a used Ducati Monster 797 Plus at Ducati Kawasaki, last month. This new motorcycle is so good, I really like the sound of this "pompone" engine, and the torque is present from low engine speed, which is good when you want to overtake some slow car.

But let's talk about serious news now, regarding Fuelino. The current software was not able to manage more than one injector, therefore it could be used only for single cylinder motorcycles. On opposite, the new software, which I am going to describe in this article, is now able to manage up to 2 fuel injectors. It is exactly what I, and you, need to manage a Ducati 2-cylinders engine. The compatibility is still ensured also with single cylinder engines, all you have to do is to avoid to physically connect the 2nd injector, and set the "#define N_CYLS_ACTIVE 1" instead of "#define N_CYLS_ACTIVE 2", in the file named "INJducatimgr.cpp" . Simple, right? Please download the full SW here: fuelino_ducati_v_1_0_beta1_20180815.

Due to the ability of managing 2 fuel injectors (2 cylinders) instead of 1, and due to the main purpose which is to install this new Fuelino software on a Ducati L-twin engine, I have called this new software "Fuelino Ducati".

This brand new version of Fuelino software also includes, as the previous software, the ability to log the data on Micro SD memory card. Relevant data such as "injection time", in microseconds, can be logged on your SD card, and exported in a CSV file using a PC application. The software is also able to modify the fuel injection command time, increasing it by a specific number of microseconds, which can be defined in specific calibration maps. If you have recently upgraded to an exhaust pipe like Termignoni or similar, you probably notice that the fuel mixture is going to become lean. Fuelino helps you to enrich the mixture (more gasoline = longer injection command) in order to avoid engine overheating.

By now, I had a quick look at the Ducati Monster 797 user's manual. And also, by having a look directly at the engine (and online), it seems that the injectors are Continental/Siemens Deka VII, and the original ECU installed on the motorycle is a Synerject M3C, like previous Monster (696, 796, etc.). The engine architecture of this Desmodue (air cooled 2-valves L-twin engine) is the same as the one of the Scrambler 800 Icon and similar.

The injectors can be noticed in the above picture (left side of the motorcycle), as well as in the one below (right side). In this Ducati Monster, there is only one throttle body, which then splits the air to the intake manifold to each of the 2 cylinders. For each cylinder, there is an injector. The injectors are easilly visible in the images, they are inserted in the intake manifold (black plastic tube) and they have a standard Mini Timer connector. Ducati used the same connector also for some previous Monster versions, but in the past the injectors were manufactured by Magneti Marelli (up to the Monster 1000 of more than 10 years ago, if I am not wrong), while now they are made by Siemens/Continental Deka, as explained above.

Now that I finally understood which type of injectors are installed on the Ducati Desmodue L-twin cylinders engine, the next step is to wait for these Mini Timer connectors to arrive from China (I bought both Male and Female connectors) from Aliexpress. In the meantime, I am validating the new Fuelino software "on the desk" using a fuel injection signal stimulation program, which simulates the original ECU injection pattern, and checks if Fuelino is responding correctly. Check it out.

For more information about Fuelino Project, please checkĀ  this page: https://www.monocilindro.com/fuelino/.

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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