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Need Info on LPG System.

Discussion in 'V6 Development And Modification' started by Jonesy484, Jan 26, 2011.

  1. Jonesy484

    Jonesy484 OfficialChadyMeetOrganisr

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    Hey My Names Jonesy, i have a 2001 VX S pack dual fuel, recently i have been looking at getting a new air intake, but i am unsure if it will effect the gas system or not??? :unsure:
     
  2. gregando

    gregando New Member

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    dont waste ya time wont do a thing because your gas plate on your throttle body is choking the #### out of the motor and slowly destroying the heads if they havent been fitted with hardened seats, i almost learned the hard way i bought a xu6 on gas when i got the motor rebuilt we found the exhaust valves had sunk about 70 thou into the heads so piss the gas off while you fit your new intake get ya power back and if fuel economy is what your after loose some weight in ya right foot.
     
  3. HamaTime™

    HamaTime™ VIP Member

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    Nothing will really improve performance on dual fuel (via intake efficiency) when you have the gas mixer ring on the intake pipe right before the throttle body. That is your worst enemy.

    Save your money and spend it on either:
    • A car not on dual fuel
    • Converting it to straight, direct injection gas
    • Take the gas system out and run it on petrol, and avoid giving it a bootful to save petrol
     
  4. Jonesy484

    Jonesy484 OfficialChadyMeetOrganisr

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    cheers guys thanks for the help
     
  5. bpefi

    bpefi Tech

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    Leave the lpg on - make sure you get a dual map memcal (not sure if VX has these though) so it runs better on LPG (increased ignition timing is the benefit) - fit a Blos LPG mixer off Ebay - to get rid of the gas ring restriction & use flashlube for the valve recession problem. I have a VS engine in a Hilux dual cab set up this way & there is NO loss of power - I have had runs with std VS sedans from the lights with 1/2 ton of softdrinks in the back of the ute - on LPG (admittedly I have a 3.7 ratio diff - but they didnt have the weight) & we stuck together all the way until the lanes merged. Lpg has been on for 70,000 k with the flashlube & there is no recession of exhaust valves at all. There is always an answer to a problem...if you look hard enough.. I am getting 15k per liter around town & 13 on the highway - even with the 3.7 ratio diff.. so there is a significant saving to be had..
     
  6. 383 hatch

    383 hatch Well-Known Member

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    How do you know this? Do you take the heads off periodically?

    Gas = Bin job.
     
  7. Jonesy484

    Jonesy484 OfficialChadyMeetOrganisr

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    even driving on gas i can smoke a vs eotec so there is little powerloss with my system, i just like the noise that comes from a cold air intake, and i want to know if its going to screw with the gas system
     
  8. bpefi

    bpefi Tech

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    Any less restriction in the air intake May affect mixtures - but being a feed back system as you should have it will cope with it. Cold air intake is great for LPG...
     
  9. bpefi

    bpefi Tech

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    !5 years with my own workshop & fitting LPG for experience.... We do not have to take heads off - #1 example that springs to mind - we fitted heaps of lpg systems to vehicles with OHC & lifters such as Mazda Bravo utes - the first three they didnt want flashlube fitted & they paid for it as those three all suffered valve recession & they had to remove the heads for overhaul - any system that had Flashlube fitted & used religiously never had a problem.... We fitted them as insurance policies for every system we fitted & never ever had a problem with valve recession - I think that speaks for itself.
     
  10. Jonesy484

    Jonesy484 OfficialChadyMeetOrganisr

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    Cheers man thanks for your feedback, you work with lpg systems often? or have you heard of a cold air intake every being installed
     
  11. Dr Goggles

    Dr Goggles New Member

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    My VT parts-hauler with LPG has a CAI, it's not the focus of my attention though.....It's got 320k on the clock, backfires a bit and kills airboxes.......I only lift the bonnet when something stops, got other things on me mind.........

    Dunno that the CAI puts it in performance territory .....

    To be honest , I'd never run a street car without LPG, flame me if ya want but that's another 3 to 4 grand I can spend on a race car each year........and I've handed enough over for speeding tickets...
     
  12. bpefi

    bpefi Tech

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    My forte was tuning - lpg or petrol done heaps of work on older systems though I have been out of the game for 5 years now - I put cold air intakes on everything with LPG wont hurt nothing
     
  13. druebe

    druebe New Member

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    gday i have just fitted cai to my dual fuel vr calais.....when it is on gas and i get it into top gear it will stall and wont change down gears???
    but when it is on petrol it works fine change to gas and it stalls...if i take the cai off gas works normaly as does the petrol...put the cai back on and gas stalls???
     
  14. bpefi

    bpefi Tech

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    If you change anything on the intake which changes restrictions in any way it can lean out the mixtures - so you will need a tune on the LPG to compensate
     
  15. HamaTime™

    HamaTime™ VIP Member

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    Although this was beginning of the year, since the thread was revived, I'm curious as to how this can occur when both cars have exactly the same engine (minus a couple of little differences on the plenum/runners valves) with basically the same power output, (VS 147kw - VY 152kw). Not to mention a VX is a good 250kg heavier than a VS?

    Hmmm?

    Correct. Gas is very unstable, mixtures need to be 100% correct.
     
  16. Jonesy484

    Jonesy484 OfficialChadyMeetOrganisr

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    lol :p

    10 characters
     
  17. julianvk

    julianvk New Member

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    I just put vapour injection on my Vt. Works great, I get 500-550 km's of start stop driving from a tank of gas which costs about 35-40 bucks. Power seems the same- carrying more weight obviously but the beauty of the emer vapour system is that the car runs using the ECU still and is piggybacked with its own lpg one. Optimum tune for both fuels and the lpg system runs off metered air, meaning you could change everything just like traditional petrol engine.
     
  18. bpefi

    bpefi Tech

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    So what have you done about ignition timing ? Mine (VS) was a pig until I got a dual map memcal ..to increase timing on LPG
     

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