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fuel consumption/kms per tank - ve v8

Discussion in 'VE Holden Commodore (2006 - 2013)' started by esp22, Jun 3, 2008.

  1. CSP

    CSP Banned

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    vnv8driver don't get pulled into a meaningless argument with commsirac. You can't reason with someone who no matter what thinks they're always right all the time.

    He will always believe what he wants and think it's right. Like I have said, I have personal experience with many V6 engines (2 ecotec 1 alloytec 195) and two V8 engines (Aussie 308 and Chevy LS2) so I only speak about fuel efficiency from experience yet somehow I'm still wrong according to commsirac. Go figure...
     
  2. immortality

    immortality Home of the smoky breakfast Bacon! Staff Member

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    not that it's relevant to the holden comunity but my old mans previous V6 (2.5ltr) mondeo is more economical then the identical mondeo with a 4cyl (2ltr) engine. i can say this with confidence because a gentleman at the same place of employment had said 4cyl mondeo so comparison was simple. indentical model, same year of manufacture etc.

    not so relevant but my VN V6 uses only slightly more fuel then my families 2ltr nissan bluebird. again a car we owned from new and new (er) then (the VN). against my VN retuned for unleaded fuel and a few minor mods driven sensibly. if i wanted true economy i'd drive a 1.3ltr daihatsu (can't even spell it) but i like to know when i plant boot i'm going to move. power has saved my ass on more then one occasion. i'll never own a econo box (i don't even fit in em)
     
  3. 1991_Vn2nV

    1991_Vn2nV New Member

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    ^^^We get alot of people into work complaining about the economy on their 4 cylinder Toyota Camry's, yet all the V6 Aurion Drivers love their economy, with all the Aurion drivers stating lower economy than the 4 cylinder Camry equivalent.
     
  4. commsirac

    commsirac Banned

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    Maybe you are correct about the rpm(however, it appears you havent comprehended how the number of piston strokes per minute in the current v6 and v8 are basically the same....but it doesnt just come down to reciprocating mass),Yet whatever you claim here is irrelevant to the real data out there. The aus fuel testing reveals otherwise(v8 drivers in denial again), v8s use more fuel to do the tests.....it is as simple as that. As I mentioned previously, if you can state a reason why the tests are flawed that no one has yet identified best you let everyone know now. All those silly members of the public buying smaller engine cars when they should be really buying v12s.....you are joking arent you?

    Perhaps in your tafe course you had dynamic compression explained to you? At small throttle settings the effective compression ratio is often less than 5:1 seriously reducing engine efficiency.....they did explain engine efficiency increases with compression ratio? By operating an engine with higher throttle openings, dynamic compression increases, efficiency increases due to this, and other factors.....obviously a smaller engine has to be used if higher throttle openings are to be used.

    No, these are not my strange ideas(I dont post rubbish....perhaps get a mechanical engineer to go through it with you), just well established laws of engine design that have been known for nearly a century
    Have a look at these:
    Welcome to Hefley Engine
    (WO/1996/036800) HIGH EFFICIENCY VEHICLE AND ENGINE
     
    Last edited: Jun 9, 2008
  5. 96VS

    96VS New Member

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    Hooray! Time for some physics!
    There are 4 main things effecting the economy of a car.
    1) Friction: The bigger the tyres the more grip. But inversely you will get more friction, which can be attributed to the mass of the car. Air friction, the car has to push the air out of the way. The faster you go, the more are you have to push through quickly. A (very) general rule is to go 30% faster, you need to double your power. This is the main thing that will effect a cars performance and why race cars are streamlined.
    2) Auxilaries: Air con, heaters, subwoofers all increase the revs of your engine to support the alternator, and therefore guzzle more petrol.
    3) conservation of momentum (newtons 2nd law): Force=mass x accleration. The heavier the car and the more you accelerate, the more force (pull) is needed. Cruisin at a constant speed you only have to overcome friction (newtons 1st law) slowing you down, but to speed up you need more power. hence why braking, accelerating..braking acclerating etc will ruin economy and why city driving is always worse.
    4) Engine efficiency: Combustion engines are not efficient by any means. Energy is lost through heat (friction) and noise producing 35% efficiency (electric motors being around 85-90%).The bigger the engine, the more heat loss. the bigger the crankshaft, the more momentum needed to keep it idling. the more cylinders, the more petrol gets burned per rev. and of course you lose further power through the transmission, gear changes, poor tuning etc. Commsirac is right about the engine side of things.
    So to conclude, this argument is stupid. There are too many variables and thats what the standardised fuel tests are for. To eliminate these variables. Unless you can account for all these factors, driving styles and terrains, you cannot compare data! I am sure someone nursing a V8 around in the country might get better economy than a hoon in a V6 who does city driving with the air con on and woofers blaring. bottom line, if you want to be more efficient, get a small motor, drive slowly, lose all the weight. i suggest a bicycle.
     
  6. JD

    JD Donating Member

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    i think the main reasons are:

    1. Aurion and Camrys weight about the same.

    2. V6 doesn't have to work as hard as a 4 to get up to speed.
     
  7. CalaisRider

    CalaisRider New Member

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    .

    IMHO fuel consumption carries huge variances. I have a cammed and modified L98.

    I run 3.7 diff gears rather than the 2.92 stock version for A6.


    On the highway I get between 8.5 and 11 litres per 100 depending on road conditions and speeds at the time.

    Around town in Brisbane commuter traffic its commonly up to 19 litres per 100

    And when I run Qld Raceway or Lakeside, the average is around 36 litres per 100..

    PS: It idles at between 4.8 and 5.4 litres per hr... Stock was 1.8 to 2.2 litres per hr...


    Pete
    .
     
  8. Scooter79

    Scooter79 Well-Known Member

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    How many of these threads do we need. Most people need to go take a cold shower :shutup:
     
  9. CalaisRider

    CalaisRider New Member

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    WELL SAID THAT MAN!!!!!:yeah:

    If I can go from 8.5 litres a 100 up to 36 Litres a 100 on the same car; there are certainly some variables to consider....:whistling

    .
     
  10. burnz

    burnz dah dut dut da dah

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    your not serously calling that city, crumbletown/bowral, boo (for the mexican's.. seymore to woodonga but only 18k's apart)
    try livo to bankstown 18kph average speed and i get 14/100..
    but 8.9/100 livo to caldwell..
     
  11. BANKS

    BANKS DW I'm a Spray Painter!

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  12. commodore2004

    commodore2004 New Member

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    I own a vz Berlina and on a recent trip to QLD and return i averaged 7.8 ltres per 100km I left Kurwongbah the other side of Brisbane and traveled to St Marys all up 1002 km and used 78 litres, which i think is pretty good for a V/6
     
  13. CSP

    CSP Banned

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    Bottom line...

    It's not what you drive, but how you drive it that determines fuel efficiency.

    Top Gear recently got better fuel efficiency out of a BMW M3 than they did from a Toyota Prius.
     
  14. Holdfast

    Holdfast New Member

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    Last edited: Aug 3, 2008
  15. Holdfast

    Holdfast New Member

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  16. CSP

    CSP Banned

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    Custom exhaust, OTRCAI, cutom tune.

    Dont drive flat out or stop everywhere you go.

    Dont carry un-necessary weight in your car.

    It's also manual so I can short shift a bit too - which is fine with the amount of torque the car has.

    Here's a photo some may be surprised at. This is AROUND CANBERRA driving ONLY. No highway driving included in this figure...

    [​IMG]
     
  17. Bravotwozero

    Bravotwozero New Member

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    An average of 11.4/100km would see you getting over 600 kilometres to a tank.
    If you're only getting 470 kilometres to a tank then your average is almost 15L/100km. :)

    I usually average between 12 - 14L/100KM but i don't really drive with economy in mind. I don't give it WOT either but I do take advantage of the fact I have an 8. No point buying an 8 then driving like a granny!
     
  18. Holdfast

    Holdfast New Member

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    Last edited: Aug 3, 2008
  19. CSP

    CSP Banned

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    No worries buddy :thumbsup: You too! :D
     
  20. vessm

    vessm New Member

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    Ive got ve ss manual

    I get 11.7L in the city and i havnt done highway with the mods i got
    so far but im sure it would do alright.
     

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