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Thread: MegaSquirt ECU and CarPC

  1. #11
    North of the land of Hey Huns
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    [QUOTE=Veritas;1468744]
    Quote Originally Posted by BoyRacer0013 View Post
    I was thinking about an Arduino setup, but the Arduino is really limited in the ability to output information onto a digital screen directly. I've seen lcd controllers up to three inch but I'm looking into running a 7" setup in my guage cluster area, similar to this setup . My only challenge is that I don't have OBD-II so I will have to get all my information from megasquirt.

    Not really limited in size, but in cost:

    http://www.reachtech.com/

    How large do you want it?, and how much are you willing to pay? heh.
    "stop with the REINSTALLS, what do you think we got some lame-o installer!!!" - mitchjs
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  2. #12
    Constant Bitrate BoyRacer0013's Avatar
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    Can MS also handle changes in other parameters, like altitude and fuel octane? There are ways to drive a bigger screen from an Arduino, but its not very easy. As for the GUI look at TunerStudio and MegaTunix, they both have the ability to run a dash type display from the MS, even if you don't use them for tuning after you get your tune set, it would save you a lot of work writing your own program
    Last edited by BoyRacer0013; 02-11-2012 at 09:35 PM.
    Enter the LOTUS...
    (more info here)


    Pre-build thread


    Planning: ::::::::::::
    Parts: ::::::::::::
    Build: ::::::::::::
    Test: ::::::::::::
    Install: ::::::::::::

    Oh, yeah, and build the car... ::::::::::::

  3. #13
    Raw Wave
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    I like the info Veritas posted - especially about multiple memory maps being out of date.
    LOL - I think of those that keep bragging about Haltec's 16 or 32 maps. I simply ask (how do you select which map....?". They still don't get it!! (Not to metion how each is tuned - is it only valid for that ambient temperature and pressure and testing (dyno) setup?)


    But self-tuning cannot be worse than the mapped map - it can only improve it.
    Though self tuning could occur from no map, normally it would start from some base map.
    Since all the relevant variables are known or can be ascertained (except arguably perhaps inclination), the vehicle has its own dyno and can itself tweak different values, measure the results, and store them if it's a improvement.

    Normally at least 2 or 3 maps are desirable - eg, normal, economy, and race. Lean burn is another, though it is fraught with risk, and is illegal in some places (eg, Australia).
    Race typically increase injector squirt by 10%. Economy sacrifices torque & acceleration for lower fuel consumption.
    But there can be any number of user defined desirable maps - eg, constant velocity (economical but will maintain speed up a hill) though that arguable is a Auto-Cruise issue.
    Irrespective, each can still have their auto-learning/self-tuning manipulations based on the user's desire. Race for example may desire x% better performance from eg 10% extra fuel, but may reduce the 10% factor if some rule is not met (eg, unless gain is y%, don't waste the extra fuel).


    Whilst for many the difficulty is contemplating how to self-tune (many say it's impossible LOL!), I see the difficulty as deciding what self-tune rules to use.
    The rest is easy, though finding the time for the coding would indeed be difficult... (Though basically "simple", it requires extensive thought & coding.)

    But to go to the trouble and expense of having maps dyno tuned only then to hit the road or racetrack in different weather conditions, or slightly different fuel, or later, worn injectors etc.... What a waste when you have all the dyno info at your fingertips.


    BTW - I have only considered raw CPU encoding for EMS/EFI functions. PCs or Arduinos etc were totally unsuitable (real-time, other interrupts and OS processes, and too slow!) though for gauges etc they are fine. (But maybe PCs etc are now fast enough? But I'd hate the "non-dedicated" breakdown.)
    Last edited by OldSpark; 02-11-2012 at 09:34 PM. Reason: BTW...

  4. #14
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    Hey BoyRacer,

    Not sure if you heard about this but I plan to use it in my system.

    Raspberry Pi

    It's a small SoC that is capable of out-puting 1080p for $25 w/o Ethernet and $35 w/ethernet.

    Working with my friend, we are looking at setting up Megasquirt (engine management) ----> Arduino (reading serial and forwarding information. Also will read information if screen goes down and display warning lights if needed ) ----> Raspberry PI (Receive data from arduino, display digital guage. If fails data read rolls back to arduino.)

    I'm not sure if tuner studio will work in linux but if it does, this could be a cheap, dedicated system, with great uptime and low power consumption and overall awesome flexibility. Even if the system fries, $25 and your back up and running.
    My Blog - http://brians-240sx.blogspot.com

    Carputer Progress
    Design [||||||||--] 80%
    Install [||--------] 20%
    Software [||--------] 20%

  5. #15
    Constant Bitrate BoyRacer0013's Avatar
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    Yes I have heard about the RPi, there is a thread for it here http://www.mp3car.com/general-hardwa...pberry-pi.html Im not really planning anything with the RPi yet, as I probably wont be able to get one until mid summer. But with the GPIO headers on the RPi you wont need an Arduino or Fusion Brain or whatever, it has that capability built in.
    Enter the LOTUS...
    (more info here)


    Pre-build thread


    Planning: ::::::::::::
    Parts: ::::::::::::
    Build: ::::::::::::
    Test: ::::::::::::
    Install: ::::::::::::

    Oh, yeah, and build the car... ::::::::::::

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