MRC Forum- brought to you by www.morini-riders-club.com Member: g7AW3f

Hi All,
Newbie to fuel injection on the 1200 engines here. Looking for some clues about the relationship between the Lambda, Inlet Air Temperature and Water Temperature sensors. I mean I know what each one measures. But it seems to me the outputs from them is maybe used to do the same thing e.g. adjust the fuel:air mixture. So are those outputs used all the time or are some sensor outputs only used some of the time? Or maybe some take priority over the others?

Hi Bumblebee,
there are various parameters which have an effect to the fuel quantity and ignition timing:
- ambient temperature
- engine (water) temperature
- throttle position
- air pressure
- engine speed / rpm
- front or rear cylinder
- lambda value (if a lambda controlled map is used)

There are maps and tables for each parameter in the ECU software, the parameters are constantly read and processed. The result of this process is one fuel injection and one ignition timing value for each ignition and cylinder, front and rear - they are a little bit different, because the temperature is different.

The complete ECU content is available as a binary file. With tools like TunerPro it is possible to interpret this file, as long as it is known at which position the maps, tables and some flags are located. This pointer information is stored in a TunerPro XDF interpretation file.
It is possible to edit and modify the maps and tables to optimize fuel consumption, engine power or throttle response on a dyno.

Some examples of interesting modifications:
- activate/deactivate lambda control
- modify fan activation temperature
- modify engine speed limiter
- flash a complete ECU file with better fuel efficiency and smooth engine behaviour at low rpm

There is a lot you can play - the playground is open

Regards
Ebi