Alguien puede traducir esto por favor...

Tema en 'BMW Serie 8 (1989 - Presente)' iniciado por sirgawain123, 10 Feb 2005.

  1. sirgawain123

    sirgawain123 Guest

    [font=Arial,Helvetica,Helv]Ajjj, !!!que poca fe!!!. Me habeis hecho buscar en mis archivos, abriendo una vieja herida (la de la venta del 850) Buscando en mis archivos tengo esto sobre el tema. lo pongo en ingles por falta de tiempo. A poco que se entienda esta claro. Si hay dudas lo traduzco con mas tiempo.
    PD: ¿QUe hago leyendo este foro s ni tengo ya un 850 ni me voy a comnprar un 6? So masoca!

    As Bert and Fedde alluded to, the coast down procedure needs to be peformed when there is a sustained loss of power.

    From the BMW 850 repair manual:
    Step 1 - Run engine to operating temperature
    Step 2 - In 1st gear run the engine up to 5000 rpm and then let it coast down (still in 1st) down to idle and let it idle for 10 seconds
    Step 3 - Do Step 2 two more times for a total of three times
    Step 4 - Place the car in neutral or park
    Step 5 - Idle for at least 5 minutes
    Step 6 - Shut the engine off for 10 seconds
    Step 7 - Restart the engine
    Result: Both DK motors should now be synchronized and the adaptive system engaged

    Also per the BMW 850 repair manual if the EML control unit were without power for a long period of time (e.g. more than 1 hour), its adaptive system would lose the stored values. The adaptive system needs to read in and store the input values of the engine after restoring operation of cleared-out EML control unit. The coast down procedure described above would fix this.

    Additional insight from the arhives from Jim S 02/14/01:
    On the V12 versions of the 8, there are two throttle body motors that open the butterfly valves on your intake manifolds. They are the two items sitting at the top front of your motor that look like little electric motors. In order to insure proper air supply to both sides of the engine, the butterfly-valve motors need to be syncronized to insure balanced power from each of the banks of 6 cylinders. In essence it is like insuring that both legs are of the same length for you or me. The syncronozation process adapts and changes the settings to insure balanced airflow throught the butterfly valves by reinitializing the computer feed to the motors. The 8 series actually employs adaptive computer control each time you drive the car. If you drive agressively, the car is more responsive but less fuel efficient, if you drive more conservatively, the car will adapt and will be less responsive to throttle input (and other factors) but also will be more efficient in fuel use. The system was very advanced when it was released in the early '90's. The old problems with V12 motors from makers such as Ferrari were balancing power output from both banks of cylinders and that required a lot of (spelled frequent) tuning. The DK sync is BMW's answer to those types of problems. Hope this helps.
    I don't know where that came from. It's not in the repair manual.

    The EML/DK adaptation procedure is for use only when the EML has been without power, thereby losing all the "learned" parameters. The EML software will adapt over time automatically and continually. All the "coast down" procedure does is speed the process up.

    Trust me, you'll know when you need it. Just try disconnecting your EML controller for 1/2 hour and then start the engine. Feel what an unsychronized DK setup feels like. Your synch state is probably just fine.
    The Bosch EML will adapt the throttle setup within a day or two of driving. All the three up/down procedure does is notify the EML to initiate a "fast synch", which occurs during the 5-minute idle period.

    FWIW, the M73 Seimens EML-III does not use this feature. It's adaptation occurs continuously, probably because (IMHO) the controller has enough MIPs to devote to monitoring individual bank airflow on a continual basis as part of the duty loop.

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