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Thread: How Do I Increase My Fuel Economy/Performance??

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    How Do I Increase My Fuel Economy/Performance??

    I have a 1991 GQ 4.2 Carby and I am investigating options around increased fuel economy (and potentially performance. Don't want to do a Gas Conversion as I don't do big K's in it but still want o maximise economy/performance if possible. It is stock as rock (engine) so just want to find out if I should go Full Exhaust System, Snorkel etc and anything to Carby (if possible??).

    Any Advice Appreciated

    Cheers

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    Smart like tractor Ben-e-boy's Avatar
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    its the same with every motor mate, More Air in (snorkle and quality air filter), more fuel to match, better spark, better exhaust. and a tune. A change in driving style will help too, install a vacuum gauge and it will tell you when you are driving at peak efficiency

    Benny
    96 GQ coil/Cab
    08 G6eT


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    Cheers Mate

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    pretty hard to get better than 18 per 100 k`s from those engines , i`de turbo charge it if your serious about it , got a mate with a turbo`d one , goes like stink and better economy when driven sensibly , that is shifts under 2500 rpm , he revs it 3500 though so it chews juice (and tyers )

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    As above.
    If turbo and shifting at 2500rpm is the go then I'm sold.
    BUT your needs first.

    Pertronic ignition conversion.
    Extractors. (insulated)
    2-1/2 exhaust.
    snorkel..
    reco carby.
    for a start at least.
    will see fuel and torque improvements.

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    G'day Robo, the extractors on my TB42 are not insulated. What are the benefits of insulating them?

    Rick
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    Hardcore macca86's Avatar
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    Quote Originally Posted by Silver View Post
    G'day Robo, the extractors on my TB42 are not insulated. What are the benefits of insulating them?

    Rick
    Keeping heat out of the engine bay. cool air = dense more oxygen hot air= thin less oxygen to burn
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    Such is the rule of honour.

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    Quote Originally Posted by dirtaddict View Post
    pretty hard to get better than 18 per 100 k`s from those engines , i`de turbo charge it if your serious about it , got a mate with a turbo`d one , goes like stink and better economy when driven sensibly , that is shifts under 2500 rpm , he revs it 3500 though so it chews juice (and tyers )
    Agreed - I've turbo'd mine, getting well under 18lph (just under 16) on the open road and have the auto (via TPS) changing up at low revs for economy when driving normally (in overdrive by around 50klms per hour in fact).

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    Quote Originally Posted by Kwakka73 View Post
    I have a 1991 GQ 4.2 Carby and I am investigating options around increased fuel economy (and potentially performance. Don't want to do a Gas Conversion as I don't do big K's in it but still want o maximise economy/performance if possible. It is stock as rock (engine) so just want to find out if I should go Full Exhaust System, Snorkel etc and anything to Carby (if possible??).

    Any Advice Appreciated

    Cheers
    Before you go shelling out good money on performance parts or chasing that elusive cheap running TB42
    Go get a full checkout of the motor
    It could being the age most are now and the Ks they have, be well worn now and maybe mite need a rebuild
    This age thing and high Ks will help gobble that fuel
    The TB42 carbs were never ever cheap to run when new,way back when
    They use as much fuel as an early GT 351 falcon,thats terrible,i reckon you could get the GT to run cheaper than the TB42 ...
    Then after a full engine condition report id get the carb checked out for maybe air leaks, dud seals or leaks here and there
    Extractors and all the other stuff will help on a tired ol engine but they will help better on a healthier engine

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    Thanks to all - much appreciated

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