Yes I know you are supposed to disconnect the CAT sensors. But I can’t get anywhere with the PC3 on the disastrous last and thus still BMW official map its MUCH worse than the original. But in the last few months I have made good headway by making it MUCH leaner at a few points – suddenly things behave and its almost correct. Back then I have found anecdotal evidence they richened down the bottom to stop the pop in the exhausts.
On the original map that was there for 8 years using the same PC3 with the CAT sensors off, it was running MUCH richer in a lot of places and was perfect.... With one small but irritating for me bug. Where at very high temp, wide throttle it cut back at 6200rpm due to knock. On discovering BMW had MULIPLE fixes for many small issues like the Alarm, TMPS readings, side stand starter logic, fuel trip meter corrections, ASC update (hidden) and three engine fixes I wanted it. Particularly as one was fixing a problem with Knock.... but they just detuned the bike instead of tweaking the ignition curve a smidge and richening for 200rpm on full throttle ... Thus they ruined the engine map and will NOT put the good one back on....
all BMW vehicles have for 15 years plus had MULTIPLE iterations of bug fixed software available. They over write all software and flash every module on the bike in one hit, replacing all the original software the vehicle came with - they just DON'T want you to know it exists - they ONLY want to sell a new bike NOT fix / improve an old one
its called an I-level update - with the correct tools (motoscan app) you can view what its had as it left the factory and what it has now. Usually they remain identical (never updated) for the vehicle's whole life - it shouldn't be like that. In the USA many owners literally queue up to get the latest release and get it applied for free
the world moved to nasty software in 2000 and they get round to making stuff work some time.... if its a Mercedes they go one step further.... they wait till its an old model then deliberately release buggy software updates to encourage you to buy later cars !!! nothing dangerous but certain stuff a bit more erratic, a little more frustration, works a little bit less well than it did
an example of if its needed could be on a 1 series BMW they have been over 50 different bug fixes EACH one they thought was correct and then had to fix another fault months later.
BMW release software updates 3 times a year and you can count through the iterations in lists found in the links below. Its VERY hard to track down what they do... this first links is not the last for K25 bikes but almost is (I thought there was a 3.66 iteration of dealer software) - Note: K25 bikes run K024 software
mine’s on I-level k024-17-07-500
it left the building on a bug fix k024-07-05-520 (indicated by the 20 at the end of 520 - right first time it always says 500 - check out the current 5 series for the level of minor tweaks on G30 vehicles)
it was correctly updated on prep for sale to k024-08-01-500
within 6 months of sale they had a lots of software updates and it was not applied until 10 years later !!!
this must be one step before the last for K25 bikes
http://fsfikke.com/data/P3.65.1_ISTA-P VERSION AND I-LEVEL OVERVIEW.pdf but the world moved and to update old stuff they have to fire up old dealer tools now
this is for current stuff, but its an iteration off track kxxx-20-07-500 should be current as they did the new bike software in August this year. When that happens all the old one's get another potential round of bug fixes
https://bimmerguide.de/wp-content/uploads/2020/06/V4.23.2x.pdf It doesn't mean everything changes it could be major or minor they will NOT let you know what changed or why.
In general on a BMW you ALWAYS want the latest because they do it correctly - unlike the other crooks. But on the 2007 GS they didn't get it right - they have the ability to push any of their iterations at the bike but you need the puma kids to say OK we admit its garbage. Yes, if I buy a new RT and the radio is dead after an update they will sort it with an earlier iteration. But if I say it now runs like a dog, just leave me the fixes to the rest of the bike but put the old engine map on the bike they won't do it.