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Morrisman1

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Posts posted by Morrisman1

  1. Share your Math Channel List

    in G4x

    Posted

    Nice and simple ones:

    Smoothing of the fuel level sensor to prevent intermittant low fuel warnings and give am more stable reading:
    Parameter A: GP Input Fuel Level
    Equation: av(a,10)

     

    Calculating centre diff speed differential on AWD
    Parameter A: FL wheel speed
    Parameter B: FR wheel speed
    Parameter C: RL Wheel speed
    Parameter D: RR Wheel speed
    Equation: ((a+b)/2)-((c+d)/2)

    The output of that will be km/h, positive values for front wheel spin, negative for rear wheel spin (relative to each other)

     

    Calculating Error in GPS speed readout
    Parameter A: Driving wheel speed
    Parameter B: Driven wheel speed
    Parameter C: Longitudinal acceleration
    Parameter D:
    Equation: (a-b)/c

    The output of this hopefully should prove a theory that the error in GPS speed is directly proportional to the acceleration of the car. Just taking some data points from old logs makes this appear to be about 12.5km/h per G of longitudinal acceleration. If I can pin this down to be pretty consistent then I can trim my GPS speed input with the value and make a more accurate driven wheel speed value on my AWD. Basically acceleration supplemented GPS speed. Id like to see if there was a better way of doing this too.

     

    Im also looking at doing one to calculate rate of change of coolant pressure to feed into some engine protection for my head gasket, but I haven't yet worked out what I would use as a threshold for that protection to activate as I have never had a head gasket fail yet to collect data from. 

     

  2. Star Point Grounding - Do I need to change my setup?

    in G4x

    Posted

    I'm doing some wiring upgrades on the race car and thinking about the overall design. At the moment I am using a star point grounding system on my car. Most items are all grounding to the ground plate on the fuse box (Narva 54450BL) for their power grounds. This fuse box then grounds to the battery via the chassis (this is something I want to change and run a direct cable)

    I have a plug in G4X ecu, which has power grounds to the fuse box. 
    IGN1A Ignition coils, have a power ground to the fuse box, sensor ground for trigger, and a cylinder head ground
    A couple of other non-sensitive items such as fuel pumps, wipers, tail lights, fuel level sensor etc ground via the chassis. 
    Sensors of course all ground through sensor ground on the ECU. 

    Is this a suitable system to move forwards with? I will make a change to the fuse box so that it connects direct to the battery rather than via the chassis but other than that I'm not sure if anything else should be changed. I do read in a few places that the engine block is the best point for a star point ground, however that would involve making a new chassis loom as well as the engine loom I am about to do. 

    Can any experts in this matter comment? 

  3. Base Map Availability

    in G4x

    Posted

    Im awaiting a new ECU to arrive, its a plug-in G4X which of course uses the xtreme board. At the moment there are no signs of any base maps to suit this ECU. Im quite happy setting up from scratch but the only base maps are for lower spec ECU with less inputs and outputs so are useless. 

    Will I have to wait for the ECU to be delivered before I can do anything, or will there be any base maps (for any plug in variant will be a starting point) available before delivery?

     

  5. Total fuel consumed calculation?

    in G4+

    Posted

    Hi

    Ive got onboard logging set up but something that recently came to mind was accurate total fuel consumed. Is this possible? Id like to extract the data from the log so that I know how much fuel used on each lap of each track etc.  Its nice to have that sort of data. 

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