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[SA] queries about gas, in both VR Commodore and EF Falcon

Discussion in 'General' started by P plater, Aug 12, 2016.

  1. P plater

    P plater the immortal misguided one

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    Hi all, I am after some information about gas in my cars, I will try to separate the two so it's a bit easier to read, as a note I don't drive my cars roughly and also I have a good idea of the laws around gas.

    VR: I am thinking of putting it on gas venturi mixing with petrol as well, before I go further it has done nearly 350,000 kilometres,I have a too idea for most of the system wiring but O2 sensor wiring being that there is two of them also where is a good spot to mount the converter?
    Also what is a recommended size size of converter, any pictures of the installs are appreciated,

    EF: I am thinking of a larger gas tank of about 900x400 size and moving the filler to behind the petrol filler flap, also I am considering vapor gas injection, I am thinking that it is a good learning exercise but would like to know what others think of vapor gas injection systems
     
  2. _R_J_K_

    _R_J_K_ Active Member

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    The mixer systems are pretty crappy on the Buicks/Ecotecs. They are renowned for blowing up air boxes.

    If you're only doing this to learn, go ahead. But if I was after any longevity I would be going with a lower K Ecotec and gas injection. I'm aware of one vapour injected L67 that did very well and had promising results. Flipside was there are not many places that will tune for this and he had to take the car to Melbourne.
     
  3. EYY

    EYY Well-Known Member

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    I had gas injection on my ecotec. Would never bother with a mixer system on a pre efi car again.

    Keep in mind that sequential injection is almost a must for vapor injection. Many ecu's can deal with banked batchfire injection, but it's much harder to tune. Full batch injection is apparently very difficult to do, since it puts so much load on the ECU.
     
    Last edited: Aug 13, 2016
  4. the_boozer

    the_boozer no more VK

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    aren't you meant to be a qualified gas fitter to be installing gas systems? I recently buggerised around with a emmegas system don't touch them emmegas are thieves when it comes to buying replacement parts or the software to program their stuff alot of second hand gas stuff results in nothing but trouble when you put it on another car. How far do you blokes drive a year for the cheapness of lpg to matter? For the set up cost you can buy alot of petrol being young blokes as you are you'll change cars once every 2 years anyway.
     
  5. strgas

    strgas GRA = REAL HP

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    for starters find a licenced LPG workshop to have them install the system according to regulations and legal requirements for rego and insurance purposes .

    commy at 350000kms I wouldn't recommend fitting a ring mixer system , at such high kms wear and tear on the engine leaking seals worn valve guides nothing but trouble .

    your EF is it wagon or sedan ? wagon models i have fitted a larger tank to one side of the rear compartment retaining the full size petrol tank and spare wheel unchanged , sedan models usual are fitted with a fast fit bracketed tank so choice of tank size is limited or you can fit twin tanks with a donut tank in the spare wheel well .

    for a hint on how not do a LPG conversion have a squiz a some of my pics on profile page .
     
  6. EYY

    EYY Well-Known Member

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    Yep you need to have a qualified installer connect the high pressure lines and sign it all off if it all complies. That's if you find an installer who's willing to inspect and check off your work. That'll be the hard part - not many will be willing to sign off on something they haven't done themselves. I've heard of people having it done though.

    You're not supposed to touch any part of the LPG system yourself.
     
    Last edited: Aug 13, 2016
  7. strgas

    strgas GRA = REAL HP

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    there's abit more too it then just having the high pressure lines connected and signed off ???? Rejected many vehicles for roadworthy inspections or refused to sign off coz of non compliant fitment issues ......
     
  8. EYY

    EYY Well-Known Member

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    Yes of course. I probably worded that badly. There's a checklist that needs to be ticked off. It's not as simple as it sounds, and you need to be very aware of the regulations if you want to have any chance of it being signed off at all.

    I don't recommend trying it yourself though.
     
  9. P plater

    P plater the immortal misguided one

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    Thanks guys for the advice, I Will leave the gas system to the professionals, and I Will leave the VR on petrol
     
  10. P plater

    P plater the immortal misguided one

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    Hey all, sorry for thread digging but I'm started thinking of doing the gas conversion on the VR, I have checked out its service history, which has checked out all good, the compression test was at 180 PSI, I had a mechanic test drive it and his response was that the engine felt like it had done about half of what the odometer says, hence why my gas conversion idea is on the table again, I have been given an old Impco model L converter, I have been told that an Impco system will work better for the VR, could anyone tell me what their Impco system has been like?

    Any extra questions or advice is welcome, thanks
     
  11. strgas

    strgas GRA = REAL HP

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    impco cheap and nasty wouldn't run any second hand convertor and being a simple convertor with a complex mixer , one back fire blows the mixer diagpham and shut off the air flow completely requiring the air vavle to be removed before running on petrol again then the expense of replacing the air valve and maybe the mixer to due to bent or cracked bodies ....
     
  12. P plater

    P plater the immortal misguided one

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    Thanks for letting me know about the Impco system, is there any other systems you would recommend? I have thought a Mega gas or a sprint type with the toroidal tank in the spare wheel well, but with an OMVL R90 converter, and I have the switch that fits in the fog lamp cut out on the cluster surround, would this make a good system?
     
  13. strgas

    strgas GRA = REAL HP

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    many different systems on the market these days it comes down to finding a installer who gives a sh@t about his workmanship and adheres to the regs when fitting such system and vehicles .
    ring mixer is the simplest and no moving parts to destory , ensure your base engine tune is good and no air leaks at the manifold , injector O rings , replace the evap hose under the throttle body with a single peice of rubber hose , check and replace any other sus hoses .
    BP6EFS spark plugs gapped to 1.0mm good set of leads with stainless steel wrapped core .
    Ensure they mount the donut tank with the valving at 6 oclock , this will ensure liquid gas is avaiable when accel up hill , can coast down hill of vapours ...
     

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