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Welcome to my pages about the ECU (BMS-C, DME) of the BMW F650GS. If you are willing to help me by analyzing the software, please send me an Email.
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ECU, Software, History, Links, Contact
The ECU is made by HELLA. The software has a size of
512 KByte and is saved in the soldered EEPROM. As there is no socket
like on other BMW motorcycles you have to desolder it. A description of
how to do it can be found at The FLASH AND Kristian FAQ page. Connecting
via the MoDiTec-plug is also possible with the use of the GS-911.
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Picture of mainboard |
Please find at the graphics a hyperlink (pdf)
to the description of the PINs of the MoDiTec plug and the DME
connector by Haakon |
Here are some informations about the various software versions of which (Overview of programming variants) I have got three different originals. The software IS NOT encrypted but it's very hard to identify the various parts as it seems to be a very specific BMW development. Up to now the PROGRAMMER could identify the spark map. So I gave the 5000-3611-w more spark advance.
| Version Number | CD Label |
Release Date | Idle RPM |
rev limit RPM |
Open Loop beyond RPM |
Notes |
| 5000-3611 | none | 1999/2000 Europe | 1300 | 7500 | 2000 | absolutely surgefree; bike is running hotblooded; best driving comfort; highest fuel consumption; in combination with OLD INJECTOR often stalling; rarely stalling with NEW INJECTOR |
| 5000-3611-w | none | 1300 | 7500 | 2000 | advanced spark map; there is feelable more torque and a lower fuel consumption when driving slow, e.g. city traffic. | |
| 7000-3601 | 9.3 | spring 2001 |
1400 | 7500 | 4500 | This junk spoils you with a lot of SS (Surging & Stalling); bad throttle response; backfiring; best(!) top speed and worst driving comfort |
| 8000-3608 | 10.1 | September 2001 |
1400 | 7500 | 4500 | No stalling and almost no surging, but the F650GS will behave like a Diesel vehicle - no power, a lot of vibrations and, of course, a lower fuel consumption. In addition the engine is producing feelable more heat; bad throttle response; |
In the following table there are some links to pictures which might be
of interest. Interestingely the dyno runs at full throttle are nearly
indentically of each software version whereas in real life there are
great differences especially concerning the driving comfort.
The software pictures were made by the use of MISTERED
by Hansen. The Graphical
Overviews of the 512 KByte software represent nothing else than the
space which is used by the software. According to Hansens (author of
MISTERED) explanations the regions with some regularity in the colour
pattern represent the maps (germ. Kennfelder). The other regions are
the program, most of the space is left free.
| Version Number | dyno run date |
spark map 11*14 starting at hex |
graphical overview (VERY LARGE!) |
| 5000-3611 | 20020801 | 50D6F | X |
| Same as above, but read from different ECU (other bike). As the BMS-C is self-learning there are differences in the file. | X | ||
| 5000-3611-w | 20020801 | 50D6F | |
| Heterodyning of 5001 and spark advance |
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| 7000-3601 | 50B93 | X | |
| 8000-3608 | 20020801 | 50BB9, curve the same as above |
X |
| Superimposition of all three curves | |||
The BMW F650GS is a real great bike if you modify
the adjustments of the FI. As the bike was released in spring 2000 BMW
provided it with a software which made the F650GS really hotblooded.
That "hotblooded" software was released only in Europe. In the ROW(Rest
Of World) the bike was shipped with a different software, which surged
from the beginning. The only problem was that the bike relatively often
stalled. The main reason for that stalling was NOT the software it was
the bad quality of the old injector (BMW 1354
7652159 [European machines may have 1353 2343565], Bosch 0280 156026).
So all the drivers called for a solution for that stalling.
At the same time a German bike magazine testetd the exhaust values of
the F650GS and they uncovered that the bike doesnot fulfil the
regulations. So BMW made a software upgrade for the European bikes.
From that time on the software used was the same in all countries and
now even the European bikes ran as bad as the others.
And here is what they changed: 1. the mixture was made very
lean, which makes the bike surging and the engine is getting very hot. 2.
the ignition starts 50° before the climax, this is a great stress
for the engine in thermic and mechanical aspects. 3. The signal
of the lambda sensor is taken into account up to 4500 RPM (Closed
Loop), the old European software did use it only up to 2000 RPM. That
third point seems to be the main difference betweeen the old European
and the old ROW software.
Many of us were very happy that there was a new software and we made
that upgrade. But this was a great disappointment as then the F650GS
didnot only stall it did also surge and there was feelable less power
and torque. The frequeny of the stalling decreased only with the new
injector (BMW 1371 1342366 [= Bosch 0280
155788]). In the following months BMW released some more software
upgrades which made the situation better but with the given equippment
(weak ECU and the missing of a further sensor) the bike never got back
it's old qualities. Some experts told me that it is impossible to get
the F650GS absolutely surgefree when it runs closed loop.
Now what to do? There is one solution from Techlusion - the
Fuel Nanny. That FN lengthens the duration of the injection time, so
this makes the mixture richer. In addition you have to disconnect the
lambda sensor so that the ECU is working open loop.
The other solution is the use of the old European
software, which is available at OBD-Tuning. That's what I have done.
CONCLUSION
The modifications of the software can help
to improve the driving comfort considerable and in some cases the fuel
consumption.
An increase of the power doesn't seem to be possible with pure software
modifications. It is the statement of experts that you have to change
the camshaft of the F650GS to get more HP. Only modifications of the
exhaust system and/or the air intake don't change anything.
ACKNOWLEDGMENTS
Many thanks to HAAKON, who helped me very often and designed many PDFs. Many thanks to the PROGRAMMER, who found the starting address of the spark map.
| C'mon diagnostic tool |
| GS- GS/ Dakar electrical wiring |
| OBD-TUNING |
| TECHLUSION |
20080225
