Missing Parameters in XDF

Just noticed the Ver 1.32 XDF no longer has the throttle correction numbers. Mark, why is this so?

To give a simple answer - they weren't correct.
To give an answer that is too complicated - the software in the 5AM is still being pulled apart. There is a lot of it and it takes a long time. My current disassembly is over 46000 lines.
Differential acceleration and deceleration fuelling seems to be disabled in most of the 5AM single lambda maps I have looked at, but there is provision, via multiple tables, for mixture control based on rate of change of TPS. This is then amended by engine speed, engine temperature and air temperature. There seem to be 10 tables controlling this.

Probably the most useful info to come out of the more recent software analysis is the clarification of the main and idle maps for fuelling and ignition. If you are logging and monitor GuzziDiag parameter "Unknown 58" it is the engine run mode. A value of 6 indicates main maps, a value of 7 idle maps. During warm up these values are 2 and 5 respectively. The fuel idle map uses RPM and idle valve (stepper) position to index the map. There are two idle ignition maps - one for clutch disengaged (idle_1) and one for clutch engaged (idle_2). Differences between these maps account for the idle speed increase when the clutch is pulled in on some versions.


Enough ... enough....
John.

Thanks John

Jtdesign, do you know about some table for RH cylinder idle fuel correction?
Thanks Tom

Hi Gelos,
When the ECU uses the idle fuel table (below 2600 rpm, throttle closed) the main delta fuel table is still used, so the RH cylinder fuelling is the idle table value added to the delta table value for the relevant rpm. The left hand two columns of the delta table will be applicable. There is no separate RH cylinder map or delta map for idling.
The idle map is laid out as engine rpm (rows) vs idle valve position (columns). I would expect the idle valve to have a setting between 80 and 100 for a warm engine, but you can check what yours is with GuzziDiag - use the "Idle stepper break" measurement. This number corresponds to the column heading in the idle table.

John

Hi, I tried the setup according to the instructions and it works well, thanks John for the advice. It's nice when both cylinders runs with the same AFR.

Tom