Never Before Seen In Public - 348 Fuel Map Graph (partial throttle) | FerrariChat
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Never Before Seen In Public - 348 Fuel Map Graph (partial throttle)

Discussion in '348/355' started by No Doubt, Feb 16, 2006.

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  1. No Doubt

    No Doubt Seven Time F1 World Champ

    May 21, 2005
    72,740
    Vegas+Alabama
    Full Name:
    Mr. Sideways
    #1 No Doubt, Feb 16, 2006
    Last edited by a moderator: Sep 7, 2017
  2. PAP 348

    PAP 348 Ten Time F1 World Champ
    Lifetime Rossa Owner

    Dec 10, 2005
    100,219
    Mount Isa, Australia
    Full Name:
    Pap
    #2 PAP 348, Feb 16, 2006
    Interesting pic No Doubt. But why?? Are you keen on modifying your 348 fuel map using an aftermarket ECU? You cant re-map the 2.5-2.7 system can you?? :)
     
  3. No Doubt

    No Doubt Seven Time F1 World Champ

    May 21, 2005
    72,740
    Vegas+Alabama
    Full Name:
    Mr. Sideways
    #3 No Doubt, Feb 16, 2006

    Oh yeah. I can remap the Motronic 2.7 now.

    I had to find the numerous fuel maps on the A/F chip first. I've still got some work to do to sort out the rev limit and identify which map is for the cold engine, warm engine, hot engine, poor fuel, etc...but I've found the fuel maps and I've found the ignition maps.

    Without question I can change the timing advance at various RPM's under various throttle loads. Ditto for enriching or leaning my A/F mixture at partial throttle and Wide Open Throttle (WOT).

    Also, as my picture above shows, I can graph what your 348 chip is doing.

    So if you have the CCC, Dimax, Powerchip, or whatever, I can now display your fuel/air and ignition maps (as above)...presuming that you send your chip to me to be scanned (there is one chip in each A/F ECU that holds the fuel and ignition timing maps, and those two chips are identical twins - so I only need one of your chips to give you a graph).

    Know when you run lean, when rich, when your timing is advanced, retarded, and why.

    **Especially for those of you who own one of the 58 Ferrari 348 Competiziones, now is your chance to see your factory or Michelotto Air to Fuel maps.

    Ditto for any of you with a Challenge, SS, GTS, GTB, TS, TB, or aftermarket chip.

    I've just got a 348 Spider, so that's all that I can show until 348 Brothers start sending me their A/F chips.


    Oh, I'm going to be off-line until Wednesday (sorry).
     
  4. PAP 348

    PAP 348 Ten Time F1 World Champ
    Lifetime Rossa Owner

    Dec 10, 2005
    100,219
    Mount Isa, Australia
    Full Name:
    Pap
    #4 PAP 348, Feb 16, 2006
    You've got my attention No Doubt! :D
     
  5. Steve Magnusson

    Steve Magnusson Two Time F1 World Champ
    Lifetime Rossa

    Jan 11, 2001
    26,776
    30°30'40" N 97°35'41" W (Texas)
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    Steve Magnusson
    #5 Steve Magnusson, Feb 16, 2006
    No Doubt -- What's the vertical axis name and what are the units/numbers representing? Also, is the "% Load" axis based on throttle plate position or intake manifold pressure? TIA (just interested -- I've no real need to know ;))
     
  6. No Doubt

    No Doubt Seven Time F1 World Champ

    May 21, 2005
    72,740
    Vegas+Alabama
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    Mr. Sideways
    #6 No Doubt, Feb 22, 2006
    Steve, the vertical axis is the Lambda Trim. The values shown on the left/vertical axis and in the colored illustration of the graph itself are base-10 representations of the hex values that are stored in the fuel map itself. These values tell the overall Motronic system to add more or less fuel.

    The load factor comes from a memory lookup address in the ECU (the fuel map gives an address to find a dynamic value in CPU RAM, not in the ROM chip), but I don't know if the ECU is storing throttle position, manifold pressure, or some combination of a calculated load factor "value" in that RAM address for the "% Load" figure.
     
  7. F430CS

    F430CS Rookie

    Feb 14, 2006
    34
    LA, CA
    Full Name:
    Robert
    #7 F430CS, Feb 22, 2006


    This all looks great... but what is the point? are you changing something to make HP increases? surely there is more to it than 1 map! or else those chip companies should all be listed on NASDAQ :)
     
  8. No Doubt

    No Doubt Seven Time F1 World Champ

    May 21, 2005
    72,740
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    Mr. Sideways
    #8 No Doubt, Feb 22, 2006
    Yes, there are many maps. You can modify them for more torque, or for more hp, or for better gas mileage/emissions, faster revving, smoother idle, cooler/hotter engine, etc.
     
  9. Samy

    Samy Formula Junior

    Dec 2, 2005
    603
    #9 Samy, Feb 22, 2006
    The Load index on partial load fuel mappings is related to the airmassmeter. The lookup values of the axis are stored in the ecu on wich load and rpm it has to look in wich row and column. The values in the partial load fuel mappings are only base start values the ecu lerns automaticly on driving the right values to get lambda 1.0. These values are stored in the ecu then until the batterie or ecu is disconnected. The base values are very important if an sensor failure accurs because then the automatic lerning is not active if then the base values are wrong the car runs to rich or lean. On an stock engine you won't find much hp with good durability. You can setup the engine to a better fuel f.e. 100 octan then you get some hp. If all keeps the same 95 octan no changes to the engine then its not worth to change anything in the mappings you may find 5hp with minor durability decrease. But the complete opossite is if you change the cams then you get much improvements on remap ... i would say its then also a must to change the mappings because in many driving situations the self lerning sensor lambda or airmassmeter are not active.F.e. in cold start or under full throttle then the mappings won't fit to the engine.
    ________________________
    Samy
     
  10. No Doubt

    No Doubt Seven Time F1 World Champ

    May 21, 2005
    72,740
    Vegas+Alabama
    Full Name:
    Mr. Sideways
    #10 No Doubt, Feb 22, 2006
    Last edited by a moderator: Sep 7, 2017
  11. No Doubt

    No Doubt Seven Time F1 World Champ

    May 21, 2005
    72,740
    Vegas+Alabama
    Full Name:
    Mr. Sideways
    #11 No Doubt, Feb 22, 2006
    Last edited by a moderator: Sep 7, 2017

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