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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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    Fuel indicators are usally mad even in this age of advancement
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    Did you reset the fuel meter at the start of the journey?

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    its just because of the hilly area
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    Expect less and have more
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    Default its amazing my Gli did 600 kms

    Journey started from lhr to nathiagali and then back to Lahore
    -

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    Quote Originally Posted by mani1 View Post
    Did you reset the fuel meter at the start of the journey?
    yeah i reset it at petrol pump ... not satisified with the avg , previously i had a city 2007

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    Its becaue of mountains, you normally climb up in 2nd gear, very rarely 3rd gear..so the fuel average will definately reduce..
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    Quote Originally Posted by onlyfaith View Post
    Its becaue of mountains, you normally climb up in 2nd gear, very rarely 3rd gear..so the fuel average will definately reduce..
    yeah ofcourse , i knw tht , but it shuld display 10.1km/l.

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    These meters are not accurate in any car. Don't rely on them

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    who told you that is accurate..

    Its there for your entertainment only. placebo effect that you are going green.

    e.g. I have a nissan altima here - it has nice digital bar that shows you fuel consumption - and also tank range.

    when the tank is filled up I reset the trip meter, the range shows 480 miles - NICE, but after driving 320 miles and the needle at 1/4 tank the warning message of low fuel comes on and the remaining range of 54 miles - which after 10 miles becomes 0 miles.

    so where did the missing miles go - nowhere, the pokemon meter is playing you.
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    is this because of the non accurate fuel level sensor? as i think the fuel injected can be very precisely measured by the duty cycle and injector size, and both these parameters is known by ecu...
    its all about power to weight ratio...

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    actually its Fool Gauge not fuel

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    Quote Originally Posted by Ghuncha View Post
    is this because of the non accurate fuel level sensor? as i think the fuel injected can be very precisely measured by the duty cycle and injector size, and both these parameters is known by ecu...
    No - because the changing of the engine load, throttle position, timing advance etc - makes it impossible to give you a proper km/lit reading.

    e.g. if you use 5% throttle at 120 km/h your meter should show you 30 km/lit - it does not mean you will actually get 30 km/lit
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    Quote Originally Posted by Xulfiqar View Post
    who told you that is accurate..

    Its there for your entertainment only. placebo effect that you are going green.

    e.g. I have a nissan altima here - it has nice digital bar that shows you fuel consumption - and also tank range.

    when the tank is filled up I reset the trip meter, the range shows 480 miles - NICE, but after driving 320 miles and the needle at 1/4 tank the warning message of low fuel comes on and the remaining range of 54 miles - which after 10 miles becomes 0 miles.

    so where did the missing miles go - nowhere, the pokemon meter is playing you.
    Its wise versa in my Gli, it goes beyond the range meter . Actualy the range is calculated to the avalible fuel average, But in case i manage to get more average then at the time of filling it goes beyond the Range
    Get over the fact that Xli lacks power windows, Its an Xli because it lacks thoose features or else it would be a Gli or an Altis if had all the goodies.

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    Quote Originally Posted by Xulfiqar View Post
    No - because the changing of the engine load, throttle position, timing advance etc - makes it impossible to give you a proper km/lit reading.

    e.g. if you use 5% throttle at 120 km/h your meter should show you 30 km/lit - it does not mean you will actually get 30 km/lit
    me a bit confused, if i am the ecu and i am firing the injectors, i should precisely know how much fuel i am throwing in, and i am getting the vss signal too hence i know the speed too, so theoretically i should be very precise in telling the mileage per liter.....

    now the errors can be induced by error in vss, idling on lights, error in fuel level sensor.


    but if i am cruising than the reading should be pretty precise, as only the error in vss remains, the idling part goes away and the error in fuel level sensor will only give error in range, but mileage per liter should be as precise as vss is..

    and abroad almost everything with four wheels has navigation, so you can further reduce the vss error with gps help...


    now if i calculate the mileage at 120 km/h cruising @ 3k rpm in 4 cylinder vehicle

    i am doing reverse calculation as i have no idea for how long injectors inject or how much is there flow rate


    3k rpm = 6k power strokes per min
    in an hour there will be 360000 power strokes

    lets say our car do 20 km/l, we use 6 litres in an hour

    so it will be 60000 strokes per liter
    or
    0.01667 milli liters per stroke

    now if my injector has 10 milli liter per sec capacity at the given pressure difference above manifold

    than if i inject for 1.667 msec every stroke i will be gettting the 20km/liter mileage

    in all this calculation there are no assumptions.

    now i know that milometers are not accurate, logically the calculation tells they should be, hence i am missing some thing....
    its all about power to weight ratio...

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    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.
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    Quote Originally Posted by chinyoti View Post
    Its wise versa in my Gli, it goes beyond the range meter . Actualy the range is calculated to the avalible fuel average, But in case i manage to get more average then at the time of filling it goes beyond the Range

    See - I told you its not accurate.
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    Quote Originally Posted by Xulfiqar View Post
    See - I told you its not accurate.
    and ur right about the what happens when u move ur foot off the throttle/accelerator, if i do so live readings go mad, "99.9" km/L essa hojae to maza ajai .

    And yeah, ive managed 24-26km/L at 60-80 speed 2-3k revs But eventualy it hardly gives me 13km/L

    So eventualy its for entertainment only, i agree
    Get over the fact that Xli lacks power windows, Its an Xli because it lacks thoose features or else it would be a Gli or an Altis if had all the goodies.

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