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Thread: Better Fuel Economy

  1. #1
    Join Date
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    Better Fuel Economy

    Hi guys,
    I am chasing better fuel economy in my 93 D1 3.9l, looking at all options. Is an engine swap to a diesel viable or practical? What are other people getting? Mine is about 23 - 25 litres per 100km which hurts and limits touring distances. Should I just buy a diesel and change over all the goodies?

    Also should confess I am running 33" muddies which wouldn't help the situation and prefer not to lose any ground clearance.

    Any ideas are welcome. Maximum budget would be about $10k for mods or changes.

    Cheers,
    Damo

  2. #2
    Join Date
    May 2011
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    My auto 300Tdi with a Davis Landis turbo upgrade averages 13km/l. Slow, noisy and on std tyres.

    You might like the fuel economy but will loath the sluggish diesel compared to the v8.

  3. #3
    Join Date
    May 2008
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    Buy a 300tdi.

    Wayyyyy less than 10k and swap goodies over and have change for some mods.

    Hell, buy a td5. And chip it. And swap the tyres over and you could still be under 10k.

  4. #4
    Join Date
    Jan 1970
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    Quote Originally Posted by zeroland View Post
    My auto 300Tdi with a Davis Landis turbo upgrade averages 13km/l. Slow, noisy and on std tyres.

    You might like the fuel economy but will loath the sluggish diesel compared to the v8.
    Must be sick, my tdi auto is not slow and i'm on 245/70's and a stock motor.

    4.11 gearing or defender TC will fix the oversize tyre issue, diesel swap will cost more than the vehicle is worth.
    All you can do is keep it all in good tune, pump up your tyres and drive sensibly or maybe look into an lpg conversion.
    MY08 TDV6 SE D3- permagrin ooh yeah
    2004 Jayco Freedom tin tent
    1998 Triumph Daytona T595
    1974 VW Kombi bus
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  5. #5
    Join Date
    Sep 2007
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    Get another set of standards size wheels with road tread. The tread is more important than the size for fuel economy.

  6. #6
    sparky34 Guest
    Quote Originally Posted by damo79 View Post
    Hi guys,
    I am chasing better fuel economy in my 93 D1 3.9l, looking at all options. Is an engine swap to a diesel viable or practical? What are other people getting? Mine is about 23 - 25 litres per 100km which hurts and limits touring distances. Should I just buy a diesel and change over all the goodies?

    Also should confess I am running 33" muddies which wouldn't help the situation and prefer not to lose any ground clearance.

    Any ideas are welcome. Maximum budget would be about $10k for mods or changes.

    Cheers,
    Damo
    There must be something seriously wrong with your V8 if your running on petrol for those figures, mine gets under 13 LPH on the highway at 110 klm using cruise except for big hills running on unleaded 91 ron, not great but we are driving 2 ton bricks. 2 things i have done which have massively improved fuel economy, convert ignition module and coil to Bosch as per "Bee Utey how to" and adjusted timing from 2>9 BTDC, you must be on gas for those figures.
    Sparky

  7. #7
    Landiheaven Guest
    Quote Originally Posted by damo79 View Post
    Hi guys,
    I am chasing better fuel economy in my 93 D1 3.9l, looking at all options. Is an engine swap to a diesel viable or practical? What are other people getting? Mine is about 23 - 25 litres per 100km which hurts and limits touring distances. Should I just buy a diesel and change over all the goodies?

    Also should confess I am running 33" muddies which wouldn't help the situation and prefer not to lose any ground clearance.

    Any ideas are welcome. Maximum budget would be about $10k for mods or changes.

    Cheers,
    Damo
    Ouch 25L per 100 seems alot! Depending on how many K's you do in a year its probably not worth the cost to convert to diesel. If you keep the 3.9 perhaps you could start by checking the camshaft for scrubbed lobes and a slack timing chain. By my experience with rovers/p76 (rover seems worse) turns them into gutless, fuel sucking demons when the camshaft/chain is puckered.
    I have seen a decent return on changing the 3.9 injectors from single spray nozzle to 4 nozzle 4.6 ford injectors(same 19lb) easy bolt it, well worth it.
    I would also change the LT230 transfer box to a defender 1.4 ratio from the 1.22 you have now, as with your 33" tyres it will be working hard.

    My friend used to consistantly get 15L/100 out of his 4.6 HSE Rangie (20L towing a big jet boat) and he didn't muck around. They'll never be anything like a Tdi for economy, but in good health, they do ok for a V8 lugging 2+ ton of full time 4wd haybarn around

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