F40 engine control system question (USA only) | FerrariChat

F40 engine control system question (USA only)

Discussion in '288GTO/F40/F50/Enzo/LaFerrari' started by jjmalez, Oct 22, 2017.

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  1. jjmalez

    jjmalez F1 Veteran
    Silver Subscribed

    Apr 8, 2005
    5,982
    Northern Illinois
    Full Name:
    Joseph
    #1 jjmalez, Oct 22, 2017
    Did the '91 or '92 F40's ever switch from Weber-Marelli to Bosh Motronic for their engine control system?


    Thanks

    Joe
     
  2. PAUL500

    PAUL500 F1 Rookie

    Jun 23, 2013
    3,136
    #2 PAUL500, Oct 22, 2017
    No, they are completely different systems altogether, it would have been a mammoth task
     
    jjmalez likes this.
  3. 335s

    335s Formula Junior

    Jan 17, 2007
    870
    SF Bay Area
    Full Name:
    T. Monma
    #3 335s, Sep 4, 2018
    fundamentally different-
    Marelli is, essentially, a more "sensitive" secondary load sensor driven logarithmic speed density system-Examine the partial differential equation which they provide to calculate fuel management....the throttle position sensor is NOT linear, Injection firing-double nozzles(F-40)-more complex than abstract would suggest, but none the less utilizes a MAP sensor as the PRIMARY load sensor for the Map files in the 32 pin PROM chip in ECU....
    the Bosch is ALSO a logarithmic speed density but bases it's "trimming" more heavily on slight shifts within the mapping files.... Bosch system based on the PRIMARY load sensor(usually a heated Platinum wire(LH) or, a Wheatstone bridge(HFM)- and only fuel "trimming"-so to speak-is effected utilizing TPS, air temp, cam angles, crank positions as "secondary" or auxilliary LOAD sensors

    its been decades since we had to fiddle around with this stuff like this-small volume certs and suc
     

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