BMW Motronic 1.1

[Todd Knighton]

Land Shark wrote:
> 
> At 11:52 AM 1/8/97 -0500, you wrote:
> 
> >I need a crash course on the Motronic 1.1
> >This unit is out of a BMW 325ix 1989 Box # is 0 261 200 173
> 
>  Umm.. that's Motronic 1.3, not 1.1
> 
> >I have a dump of the eprom, and have found most of the tables i just need to
> >know how to identify if they are for fuel, Ign, dwell, lambda and warm-up,
> >also i would like to find the rev-limiter, how to read the service codes and
> >how to set the service lites back to zero.
> 
>  Service codes are best read by the old accellerator pedal trick
>  which flashes out 4 digit codes on the Check Engine lamp
> 
>  Service lites have NOTHING to do with the Motronic!!
> 
> >Is it possible that some maps are only one line.??
> 
>  Sure it is..
> 
>  But WHY in Gods sake are you messing around with your Motronic
>  unit.. EVEN if you find the maps you need, you cannot change
>  them, because you will set a checksum fault, there are hidden
>  checksums in the EPROM, 1 in M1.x, and THREE in M3.x
> 
>  To figure it all out PROPERLY will take you MONTHS
> 
>  Trust me.. I did it .. with help from a genius of a robotics
>  engineer... WE know of exactly ONE other guy who really knows
>  how these things work.. ONE..
> 
>  Most of the "chip tuners" have NO clue!!
> 
>  You need to disassemble the thing..
> 
>  You need to extract the ROM code out of the 80C515 processor
>  (there's a GIFT, the CPU ID, took us 2 months to find it out!)
> 
>  Merge it with the EPROM code..
> 
>  The run a dissassembler on it..
> 
>  THEN you will need a DYNO, an AFR meter, and a lot of skil
>  to tune your car in..
> 
>  A "crash course" won't do here... these things were NOT designed
>  to the tuned outside of the OEM realm.. unlike Motec, EFI, etc etc
> 
>  Jim

Hear, hear.  Or is it Here, Here.

Todd Knighton
Protomotive Engineering.

P.S.  the other guy that knows these things.  Besides.  Why would we
want to give you the information that's taken us months and years to
figure out ourselves?