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Thread: Spoofing the Motronic 1.3 (aka basic engine theory)

  1. #11
    Join Date
    Jan 2004
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    4,150

    Default and a little more.

    .
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  2. #12
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    Default heeey...where'd the timing map come from?

    The other stuff I pretty much have figured out...curious the source of all this.

    Thx Bill!

    Jeff
    Bellevue WA
    90 535iM - not much stock remains. 3.7 liters, ported head, cammed, 3.73 diffy, M5 brakes, MAFed, yadda yadda yadda
    86 Porsche 951 - Track Toy

  3. #13
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    Default

    bosch manual?
    Alusil, Dinan DME | ITG Air Filter | Eibach/Bilstein HD | 26/20 Swaybars | Iridium plugs | Depo/ProLumen HID | Optima batt. | no AC | Stoptech brake lines, Frozen rotors, brass bushings, Superblue

  4. #14
    Join Date
    Nov 2004
    Location
    Middle England
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    286

    Default

    Quote Originally Posted by Jeff N.
    ... Richer mixture needs more time to ignite thus the added advance.
    True, the speed of the flame front (explosion) is slower.

    Quote Originally Posted by Jeff N.
    ... if the air temperature rises ... you reduce the advance to mitigate the chance of ping/knock with a lean mixture.
    Yes, this is logical action that most ECU's take, but obviously in varying magnitude.

    Quote Originally Posted by Jeff N.
    ... I can counter the rich mixture by adjusting my MAF signal.
    This will work, but only partially - not the complete answer.
    '90 535iSE Auto (AE+EAT) 123k miles
    '86 F288 69k miles
    '06('89)- PGE 2.0DOHC Turbo
    '03 A160LE 19k miles
    1914 Stellite E2A (no odometer!)
    (+ others I daren't mention here)
    www.pyghtle.com

  5. #15
    Join Date
    Dec 2003
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    1,640

    Default Thx ...

    Concur that spoofing a cold run to get advance and then cutting back the airflow signal is a less than desireable hack.

    Again, curcur adjustments are ECU dependent. Have any details on how the motronic adjusts?

    Quote Originally Posted by zygoteer
    True, the speed of the flame front (explosion) is slower.



    Yes, this is logical action that most ECU's take, but obviously in varying magnitude.



    This will work, but only partially - not the complete answer.
    Bellevue WA
    90 535iM - not much stock remains. 3.7 liters, ported head, cammed, 3.73 diffy, M5 brakes, MAFed, yadda yadda yadda
    86 Porsche 951 - Track Toy

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