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Thread: Gli fuel indicator is not accurate

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    Angry Gli fuel indicator is not accurate

    i went to murre on GLi , and it was indicating 12.3/l . strange thing is tht , i used 2000 petrol for 214km.


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    Quote Originally Posted by Xulfiqar View Post
    so what would being the ECU show - when you are in overrun mode, the fuel injectors completely shutoff until the engine rpms get to about 1400 - then the injectors start spraying again.

    Having a VSS signal but no throttle load going downhill - hmm 10,000 km/lit - as you wont have any fuel going in.

    Now consider the engine is under maximum load, full throttle acceleration at 140 km/h - VVTi cam rotated or if Honda VTEC or if mitsu then the MIVEC, injector duty cycle near maximum, engine rpm 90% of allowed limit, but the road is an incline, not much speed is gathered. what will you show?

    Then you have to account the engine loading charecteristics - (what the MAP Sensor measures) - low rpm full throttle application = driver needs full power NOW, the ECU foreman shouts inside - everything IN NOW.
    and then the driver may also be at 10% throttle at 120 km/h - and also be on overrun sometimes.

    Thats why, its a reference which is not fully accurate. Because if it were accurate it will not be humanly possible to read it.

    agreed to all this but at the end of the day the ecu is firing the injectors, even if its in overrun mode, or 90% duty cycle, it knows the accumulative injector on time hence hte total fuel injected and knows the distance covered, so the average fuel mileage should again be accurate, yeah instantaneous mileage will be all over the block.
    its all about power to weight ratio...

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    Wrong tyre size and fuel filling station errors should be accounted for and that is something ecu cannot do.
    Keep a cool head and wear seatbelts!

  4. 28-07-2011, 07:23 AM

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  5. 28-07-2011, 07:36 AM

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    Quote Originally Posted by Ghuncha View Post
    agreed to all this but at the end of the day the ecu is firing the injectors, even if its in overrun mode, or 90% duty cycle, it knows the accumulative injector on time hence hte total fuel injected and knows the distance covered, so the average fuel mileage should again be accurate, yeah instantaneous mileage will be all over the block.

    See

    we are back to square one - that little gauge is telling you an approximate reading - that spans many variables.

    Go check an oldschool W124 benz with jetronic injection - no ECU there but it has an analog economy gauge, its actually a manifold vacuum gauge, more vacuum = more economy, less = less economy. And its literally connected with a vacuum pipe.

    Gli fuel indicator is not accurate - IMG 3273

    Works quite well.

    The older BMWs also had it - operating the same way. and had a range of 5 km/lit - 25 km/lit
    ZRS - Zulfiqar Racing Systems ..... - professionals at work - at crackwheels.com

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    Quote Originally Posted by Xulfiqar View Post
    See

    we are back to square one - that little gauge is telling you an approximate reading - that spans many variables.

    Go check an oldschool W124 benz with jetronic injection - no ECU there but it has an analog economy gauge, its actually a manifold vacuum gauge, more vacuum = more economy, less = less economy. And its literally connected with a vacuum pipe.

    Gli fuel indicator is not accurate - IMG 3273

    Works quite well.

    The older BMWs also had it - operating the same way. and had a range of 5 km/lit - 25 km/lit
    this is useless if its only connected to intake, equal amount of vacuum either in 1st gear or 5th gear will give you same reading here, though huge difference in speed.
    its all about power to weight ratio...

  8. 29-07-2011, 06:59 AM

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    why is it useless, its not showing you the distance you will cover but rather that you are driving economically, higher vacuum means less air/fuel mixture is being sucked in, hence higher economy no matter what gear.

    And you obviously know that if your engines A/F mixture or ignition timing is disturbed your manifold vacuum is also disturbed - hence will show bad economy. - The old 1978 cressida also had this gauge, but it was huge, it was inplace of the tachometer, it swept like a tach too, the higher the engine throttle was opened and the higher revs it attained the higher the meter showed.

    The reason Im posting this picture is that even with a calculation going on, this gauge shows the exact same results... - why - because the calculations going on also result in a variable.
    ZRS - Zulfiqar Racing Systems ..... - professionals at work - at crackwheels.com

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    Sometimes my gli indicator shows 36km/l or 99km/l thats to fool customer
    Aunda Fan

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