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Thread: Triple carb & ITB duality

  1. #1
    Nova Scotia,Canada,Earth Blue's Avatar
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    Default Triple carb & ITB duality

    In theory one could drill out and install efi bungs on a triple carb's intake manifold then just use the carbs as throttle valves only. Removing the venturi's or reshaping would open up the upstream.

    Just a thought.


    The only applications I can think of are carb vs EFI dyno tuning convenience or using both at the same time so that carbs run slightly lean at ~90% of the fuel demand and the EFI acts as a tweaker to make up the rest to a finer precision.
    Last edited by Blue; 10-24-2012 at 05:18 AM.
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  2. #2
    Registered User madkaw's Avatar
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    Default

    I think it would be a lot of work and money and weight for little gain vs. just getting a EFI intake and committing to EFI. In the end I think the ECU would dictate the performance and I think it( aftermarket ECU) would make significant gains in tune and power.
    The idea is doable for sure, and I have thought of it myself, but in my case my triples are so nice I would assume selling them to pay for a true EFI set-up, maybe even true ITBs. Now if you had some junk triples laying around you want to junk, than sure. But I would think the reason they were junk is because the throttle shafts were worn more than anything and that's what you need.
    In my case, I just purchased a project off of ebay that someone started using a Cannon triple manifold mated to a homemade plenum . I will be weding EFI bungs to the manifold and go with a single throttle body. It seems the cheapest route and probably the easiest tunable set-up over ITBs
    Steve
    71 240z,bw-5sp 2.4-40 over,balanced,e-88,big valves,ported&polished, stage2,header, triple Mikuni's 40's
    3.90 Subaru STI LSD

  3. #3
    Crumudgeon
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    Default

    That's been done any number of times. You would remove the venturis completely because they are not needed. I've seen one set where the owner ground off the float bowls and all ancillary casting and ended with with a nice looking set of ITBs.

  4. #4
    Registered User madkaw's Avatar
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    I've heard of this done, but never have seen any finished products. Grinding down the float bowls would slick it up for sure. Love the innovation of the Z community!
    Steve
    71 240z,bw-5sp 2.4-40 over,balanced,e-88,big valves,ported&polished, stage2,header, triple Mikuni's 40's
    3.90 Subaru STI LSD

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