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So the 850i from 1989-1994 came with the 5L M70 V12 and a 4 speed ZF 4hp24 gearbox apart from a few rare 6 speed manuals. BMW produced only a very few 850ci's (in fact there were less of these than the coveted 850CSi) from 1994-1997 with the 5.4L M73 engine and a 5 speed tiptronic ZF 5hp30 (and even rarer six speed manual). While a manual conversion is very appealing it's also bloody expensive and I think a GT car really should be an auto. My 4 speed with 3.64 LSD and Wokke chips is great but I can't help thinking how much better (and faster) it would be with the 5 speed tiptronic box which are far easier and cheaper to find than a manual six speed for a V12. Fitment would be no problem but the issue - I anticipate - is going to be communication with the rest of the car since the M70 DMEs and 4hp24 EGS are non-CANBUS but the 5hp30 EGS is CANBUS. Can't find any examples of this being done online so I'm guessing it's not that easy. So my questions are: Any ideas how you could translate DME data to the EGS from an analogue signal (or whatever it is) to CANBUS, and vice versa? Could you run a parallel but independent controller for the transmission? (or would that mean you lose things like cruise control, etc) Would it ultimately be easier (albeit time consuming and expensive) to swap a complete M73 and gearbox?
