I recently got myself a clone GT1 and have been looking through the diagnostic functions within the SMGII control unit - interestingly there's lot more functions than I initially thought and I now have an alternative theory to the slur.
On the service functions there are usually 4 procedures involved whenever a clutch kit is replaced or the gearbox is pulled:
1. Re-teach clutch curve
2. Reset clutch slip point
3. Full gearbox adaptation
4. Re-teach longitudinal acceleration sensor.
Each of these are done in a particular order - if you do one before the other the gear operation doesn't work properly (yes I tried it and it was horrible haha ... ended up throwing a couple of codes which I had to clear :hahaha
These are the normal functions performed by BMW whenever they are told a clutch is slipping (usually they will simply reset the clutch curve and re teach the slip point as an initial measure).
In addition to this there's also an additional reset function for the clutch curve - this I am presuming must be a rest of adaptation values within the software.
Now if the hydraulics are opened up there are separate function that "vent" various valves within the hydraulic system - these are usually NEVER performed.
I've yet to try it on my car as personally I reset my clutch curve and reset the clutch slip point on a very regular basis and I don't have any slip or slur issues.
I am still going through all the functions on the valve vents - but a couple of these relate to the clutch hydraulics (I am not talking about bleeding the clutch reservoir fluid here - it's something else as far as I can tell).
My point here is - much like a normal manual transmission - if the hydraulics aren't bled properly (or the valves operating them) you are going to get slip even if you do the full readaptation functions - I personally think this has a big variance on why we are seeing slips in the clutch system. Put it this way, when was the last time any of the owners actually got the dealership to bleed their clutch system or the SMG pump?
I've also been tempted to fully reprogram the SMG control unit via the SSS progman, but have been a bit too scared about bricking my control unit - maybe later when I've learnt how to use the GT1 and SSS properly.
On the service functions there are usually 4 procedures involved whenever a clutch kit is replaced or the gearbox is pulled:
1. Re-teach clutch curve
2. Reset clutch slip point
3. Full gearbox adaptation
4. Re-teach longitudinal acceleration sensor.
Each of these are done in a particular order - if you do one before the other the gear operation doesn't work properly (yes I tried it and it was horrible haha ... ended up throwing a couple of codes which I had to clear :hahaha
These are the normal functions performed by BMW whenever they are told a clutch is slipping (usually they will simply reset the clutch curve and re teach the slip point as an initial measure).
In addition to this there's also an additional reset function for the clutch curve - this I am presuming must be a rest of adaptation values within the software.
Now if the hydraulics are opened up there are separate function that "vent" various valves within the hydraulic system - these are usually NEVER performed.
I've yet to try it on my car as personally I reset my clutch curve and reset the clutch slip point on a very regular basis and I don't have any slip or slur issues.
I am still going through all the functions on the valve vents - but a couple of these relate to the clutch hydraulics (I am not talking about bleeding the clutch reservoir fluid here - it's something else as far as I can tell).
My point here is - much like a normal manual transmission - if the hydraulics aren't bled properly (or the valves operating them) you are going to get slip even if you do the full readaptation functions - I personally think this has a big variance on why we are seeing slips in the clutch system. Put it this way, when was the last time any of the owners actually got the dealership to bleed their clutch system or the SMG pump?
I've also been tempted to fully reprogram the SMG control unit via the SSS progman, but have been a bit too scared about bricking my control unit - maybe later when I've learnt how to use the GT1 and SSS properly.
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