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VT Carby conversion

Discussion in 'VT - VX Holden Commodore (1997 - 2002)' started by OldSchoolYoungster, Sep 10, 2016.

  1. OldSchoolYoungster

    OldSchoolYoungster New Member

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    Long story short: bought a vt cheap, did the head gasket, discovered gudgeon pin knock.

    Since I had a spare 305 chev laying around, I decided to do away with the V6 and chuck in the chev. I'll be sitting a T5 behind it, but we'll get to that later.

    Rather than buggering around with finding a firebird computer to suit the tpi engine (or other avenues regarding EFI), I've stripped the engine down and decided to keep it old school. HEI dizzy, 650 holley vacuum secondary, etc. etc.

    My quarrel is this...
    I don't need the computer to run the engine, but I need it for other vehicle accessories.
    As such, would you weed through the wiring looms and remove unnecessary wires?
    Would you sit the donk in, disregard the computer and hope it all works as is?
    Or would you disconnect the computer and hard wire in the rest of the system?

    I'm short on money, I'm not short on patience and resources. Therefore, I'm not interested in hearing your opinions on the (subjective) futility of the project. I'm posting this hoping someone might have some valued input regarding the VT system, and what they would do given the circumstances.

    I appreciate any advice given, thanks in advance.
     
  2. OldSchoolYoungster

    OldSchoolYoungster New Member

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    Oh, and for all intents and purposes, let's assume this thing will be engineered and registered legally.
     
  3. Deuce

    Deuce Super Stock

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    I would offer advice/help/suggestion. But I just cannot get over the fact that unless you move to NZ, I do not see how it would get registered and legal. Sorry

    Maybe switch the carb for a HolleyEFI TBI unit? or will that blow the budget? Cause you may be able to get it legal that way
     
  4. OldSchoolYoungster

    OldSchoolYoungster New Member

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    It's already registered. I plan on driving it until it gets defected, then i'll throw the donk in something else a little more fitting. the legalities aren't my question.
     
  5. pebbs

    pebbs Member

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    And the consequences of insurance should an accident happen? Hope you do indeed have plenty of money, you may need it.
     
  6. Commo Baba

    Commo Baba Active Member

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    plus that cos it's not about needing to pay for someone's Porche it's about having to pay for someone's death or paraplegia. Insurance won't cover you for anything when they find that 'mod'. Even if you've got some 'papers' for rego they are for the car the way it *was*.

    OP's comment about 'let's presume it's all legal' and then telling us it's in no way going to be legal pretty much puts the cap on anyone on a responsible public forum from 'assisting to conspire'. If you go ahead with it you need to get the legals done too. Can you ask an 'authorised engineer' before you start ?

    I'm sure the OP will hate me for my post. Sorry mate. That's the way it looks from here.

    (BTW it's a bit more than a 'VT Carby Conversion' don't you think ?)
     
  7. Skydrol

    Skydrol Well-Known Member

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    My take... if you just want it to run with off the shelves parts, then, the Holley Carb is what I will do. The wires, do not cut a darn thing, cap and tuck them somehow; you might need to go back or need the wiring for some, you never know. I say, gauges will be the biggest challenge and the ignition/lock system. You might need to disconned the Check Engine light, the ECM will be throwing codes; but, if you do not care looking at the CEL on, leave it.

    Forgot about the transmission. If I am not mistaken, the PCM/ECM reads the load via engine sensors (Throttle Position, Intake Manifold Vacuum) to determine on what gear needs to be on. On the old days, a TH400 used a Vacuum Modulator and that was all.

    That will be power and economy efficient, nope, that will run, yes, like 70s 305 Cu In motor.

    I think the easiest/cheapest aproach is to keep it 100% stock.

    This reminds me the show Scrapheap Challenge.
     
    Last edited: Sep 10, 2016
  8. OldSchoolYoungster

    OldSchoolYoungster New Member

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    Yeah, point taken. I think it's bullshit that because an engine/vehicle combination - regardless of safety - does not meet emissions requirements, it is illegal and will never be allowed on the road. Some country we live in...
    Having said that, I understand your consternation and will not go ahead with the project.

    Cheers.
     
  9. vr304

    vr304 Well-Known Member

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    Feel sorry for you Ozzie boys with all the stupid modification laws over there, could be done here in NZ legally provided it was done properly
     
    kiwicon likes this.
  10. Skydrol

    Skydrol Well-Known Member

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    On your project to make it work with the least amount of cash. IMHO, I see a money pit taking that aproach. I would be visiting some junk yards and see what kind of parts I can get for cheap. If the vehicle is fine, drive it until the wheels falls off.

    If you can score a manual tranny that can be fitted on the 305, I see the change doable. Not a clue about you guys emission laws, that will be some that might bite you later using that Carb.

    Here is another movie analogy... Apollo 13, "Fit a round filter in a squared hole, using nothing but this"
     
  11. Commo Baba

    Commo Baba Active Member

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    Modding stuff in the US is completely different. Cost and legals. The Apollo 13 situation suits this.
     
  12. strgas

    strgas GRA = REAL HP

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    better hope the defect is a cheap one ????
     
  13. Skydrol

    Skydrol Well-Known Member

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    Here is the irony and the double standard crap in the USA. VW got a huge black eye for their TDI. I can say loosly, 75% of the US does not have a Smog Check and about 40% does not even have a Safety Inspection. If you live in the center of the US, you can remove the Catalytic Converter and nobody gives 2 shits about. Unless you live in 1 state, California, they are the pollution Nazis. They want the rest of the world to live by their standards.

    I think this mod is not a cost effective alternative.
     
  14. vc commodore

    vc commodore Well-Known Member

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    It would be cheaper and easier to get another VT motor and throw that in, rather than stuff round with what you want to do....VT motors are a dime a dozen.....If you have problems locating one, send me a message and I'll put you onto a wrecking yard that has a fair few and won't ask for half your arm for it
     
  15. lout

    lout Well-Known Member

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    just go to wreckers buy $300 motor, drop it in and be back on the road tomorrow without the cost of all the bits to make the chev work
     
  16. gtrboyy

    gtrboyy Well-Known Member

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    I would leave ecu & bcm all hooked up even most of the wiring loom so you can use factory temp sender,oil sender/fuel pump function etc just as if it still had v6 so everything on car still works.

    Then just tap coil with 12v accessory to coil
    Change/rewire at fuel sender to hook up external low pressure fuel pump
    Add rev tacho
    Fan controller if required

    Once running start taking out injector wiring etc just make sure it still runs as you delete crap lol


    **** It probably easier & quicker to swap another v6 than fabricate sump,engine mounts & headers lol

    Ironically there are a few 202 powered vs commodores on dirt tracks
     
    Last edited: Sep 11, 2016
  17. VtChubby

    VtChubby New Member

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    Fellas I love this side it's helped me out heaps aye but for the little sooks that spend their days saying yes sir no sir I promise mum I'll clean your barina once I put the Milo tin on I'm going to give you another angle to look at things from
    At the start of the year I had full custody of my infant (I also have a 10 year old I have every weekend) now my ex wanted a visit and once she got she vanished nek minutes bullshit paperwork ensured my only chance of seeing her again is through the courts naturally all my $$$ are goin to lawyers... fast forward 248 days and many many efforts to find something to calm the beast my clubby and working on it is the best therapy I can afford with mates that listen better than any shrink and I'm now at a point where I too am going to a carby set up... so just stop before you be a nazi sometimes people ask these questions and yeah they may need engineering but their reason behind it is something that could rely on you guys imparting your knowledge to him her
    Modding my car helps me keep my **** together
    My mates and people on this forum have all helped I thank you and just ask to bare in mind that some people have a reason other than fuckwittery for asking advice sorry mods it's a long post just needed to open the eyes of the blind before they judge others
     
  18. Jxfwsf

    Jxfwsf Well-Known Member

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    Legalities and emission testing aside.
    Why would you want a carby, efi shits all over it, as suggested use a throttle body injection setup.

    Or convert the car to LPG, remove the entire petrol system (inc tank) with a couple of impco 425's and run whatever year engine you like without any problem.
     
  19. vc commodore

    vc commodore Well-Known Member

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    I'm not having a shot at you, as I have been through the same type of ****, with kids and the court system.....I spent 2 years gaining guardianship of a child and the next 16 bloody years putting up with the birth parents **** associated with the guardianship order....Including the idiots moving to another state and trying to start proceedings in that state....

    Seriously, fitting an injection system, or even a gas system will be cheaper in the long run (saves on defect money) and gives you the time with your mates and the car to get it going and less hastles in the long run with coppers and your hip pocket. And yes, it's my experience speaking with this advise
     
  20. Skydrol

    Skydrol Well-Known Member

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    I say, GM TBI system is better suited.
     

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