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Thread: Disco D2 TD5 Diesel Fuel economy

  1. 14th April 2012, 09:52 PM #81
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    Yeah I know it's seems hard to believe but theys were the numbers.

    I don't know the physics but others report increased boost equals better mileage,

    110kmh on Cruise control except for a couple of the hills, back to 100kmh when I manually controlled the pedal to stay in T/C lockup and no kick downs.

    But it was only me in the car, and no load .
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  2. 15th April 2012, 10:12 AM #82
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    It's do-able ... and I might add ... I find that if I drive a little harder/faster on the open road, I get better economy. My wastegate is already wound up to around 19.7 peak.

    More boost ? Who knows, but the figures are pretty constant ... 85-95 gets me 24-25mpg ... 105-110 gets me 26-28mpg. (minimal use of cruise).
    Kev..

    Going ... going ... almost gone ... GONE !! ... 2004 D2a Td5 Auto "Classic Country" Vienna Green

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  3. 15th April 2012, 02:48 PM #83
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    Quote Originally Posted by Fluids View Post
    It's do-able ... and I might add ... I find that if I drive a little harder/faster on the open road, I get better economy. My wastegate is already wound up to around 19.7 peak.

    More boost ? Who knows, but the figures are pretty constant ... 85-95 gets me 24-25mpg ... 105-110 gets me 26-28mpg. (minimal use of cruise).
    Better mileage because you get there quicker, therefore the engine is running for less time - GRIN
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  4. 15th April 2012, 02:55 PM #84
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    Quote Originally Posted by gavinwibrow View Post
    Better mileage because you get there quicker, therefore the engine is running for less time - GRIN
    Less time driving = less diesel has leaked from the fuel press reg or the fuel tank/filter pipes
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  5. 15th April 2012, 10:07 PM #85
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    I have the same model, i got to 760kms before i filled up and still had 20 litres left. I love my disco, runs great
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  6. 18th April 2012, 10:36 AM #86
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    Quote Originally Posted by northiam View Post
    How does turning up the boost improve mpg (increased power = increased fuel consumption)?
    More boost = more oxygen = fuller, cleaner burn = more power from the same amount of fuel.
    Therefore if you don't use the extra power & drive like you did before you should use less fuel.
    That's the theory anyway. The physics is OK but every time I increase power on any car I have I end up using the power & my fuel consumption climbs.
    Cheers,
    Alex
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  7. 19th April 2012, 07:39 PM #87
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    Quote Originally Posted by Alex 110 View Post
    More boost = more oxygen = fuller, cleaner burn = more power from the same amount of fuel.
    Therefore if you don't use the extra power & drive like you did before you should use less fuel.
    That's the theory anyway. The physics is OK but every time I increase power on any car I have I end up using the power & my fuel consumption climbs.
    Cheers,
    Alex
    Whose theory is that????

    More oxygen requires more fuel------or you get lean mixture!!!! You need more of both to get more power! It can be a little lean or a little rich either way but too much of one or the other and you will achieve nothing / negative result / or engine damage.

    Any argument???
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  8. 19th April 2012, 08:46 PM #88
    strangy
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    [quote]
    Quote Originally Posted by davrac

    Whose theory is that????

    More oxygen requires more fuel------or you get lean mixture!!!! You need more of both to get more power! It can be a little lean or a little rich either way but too much of one or the other and you will achieve nothing / negative result / or engine damage.

    Any argument???[/QUOTE
    No need to argue. You need to do bit of reading to understand your diesel.

    Plenty of posts and threads already here, so no need for anyone to start from scratch.
    Cheers
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  9. 19th April 2012, 11:30 PM #89
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    Quote Originally Posted by Alex 110 View Post
    More boost = more oxygen = fuller, cleaner burn = more power from the same amount of fuel.
    Therefore if you don't use the extra power & drive like you did before you should use less fuel.
    That's the theory anyway. The physics is OK but every time I increase power on any car I have I end up using the power & my fuel consumption climbs.
    Cheers,
    Alex
    D

    Me thinks Alex was hinting at "volumetric efficiency".
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  10. 20th April 2012, 09:34 AM #90
    Mundy
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    Quote Originally Posted by Fluids View Post
    ... 85-95 gets me 24-25mpg ... 105-110 gets me 26-28mpg. (minimal use of cruise).
    I don't know about the impact of waste gate pressure on fuel economy but at higher speeds, going faster isn't going to get you better fuel economy.

    Wind resistance (and a number of other energy consuming factors) is proportional to the square of the speed. Wind drag doesn't make a great difference below 60kph due to the other factors but over that it starts to make a big difference, especially for a brick like a disco. At 110kph the drag is 67% greater than for 85kph. You may recall the Top Gear Veyron video where at 150mph they needed 200hp but at top speed of 250mph it needed 1000hp and only had fuel for 12 minutes.

    The energy used to accelerate to a given speed is also proportional to the square of the speed.

    Thus at elevated speeds, better fuel economy is likely to be more due to driving technique, hills and traffic and not to the speed itself.
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