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Thread: 16v quad throttles or twin carbs?

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    Default 16v quad throttles or twin carbs?


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    Alright I'm looking for opinions on quad throttle bodies from an ae101 or twin carbs fitted to 16v 4age

    In terms of set-up, performance and driveability what can you guys tell me? I would guess that the carbs would be easier to set-up while itb's would give better driveability. No idea on performance

    And no it will not be a daily, pretty much something i can out to the track and go hillsy's a few times a week..

    positives and negatives of both would be sweet

    Cheers, Ben.

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    Senior Member all torque's Avatar
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    Carbs could give perfectly fine driveability, so long as they are properly matched to the engine, and set up correctly.

    As I understand it, you need a pretty built N/A setup to reap any real performance benefits from ITBs. That said, I would imagine they give better throttle response no matter what.
    Quote Originally Posted by slydar View Post
    The real question is - if you can not even make an attempt to write a question in the manner in which someone is likely going to want to answer it... do you really think you're capable of doing an engine conversion?

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    yeah i mean quad throttles would be smoother to drive

    will be running stock bottom end, trd 0.5mm head gasket, big cams, ported and polished head

    you say you would need a worked engine to get any benifits from itb's, but then couldnt that also be said about twin carbs?

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    Senior Member all torque's Avatar
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    Quote Originally Posted by benzo View Post
    you say you would need a worked engine to get any benifits from itb's, but then couldnt that also be said about twin carbs?
    Well the usual 40mm Dello'ortos that people put on their 4AGE's, came standard on a whole bunch of Alfa Romeo's. 1.8 and 2.0 liter Alfetta's for example, which are nothing remarkable performance-wise.

    But I guess with those engine mods, you're talking about bigger carbs. In which case, the short answer would be yes.

    Personally I'd go for the ITB's.
    Quote Originally Posted by slydar View Post
    The real question is - if you can not even make an attempt to write a question in the manner in which someone is likely going to want to answer it... do you really think you're capable of doing an engine conversion?

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    Hmm yeah thats what I was leaning towards

    how do people go about fitting quads from 20 valves to their 16valves?

    Cheers, Ben.

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    In short You need an adaptor manifold. T3 (techno toy tuning) do one. And a programmable ecu obviously.

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    carbs. do it


    Quote Originally Posted by ae86 View Post
    ive come to the conclusion dan has more STi's than a Subaru Dealership, yeah i went there

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    lol but why carbs over itb's

    what are these twin carbs like on 4ages?

    I had a weber on my old worked 4k KE20 and it would not idle at morning or night, was an absolute pig until warm

    I'm liking the idea of quads atm, just because it retains efi and that to me spells reliabilty and decent driveability.

    carbs do seem so much cooler though

    Sway me

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    Go EFI

    doesnt go out of tune
    starts easy, everytime
    has cold start to warm the motor up
    can easily remap to suit future upgrades
    possibly cheaper?
    RT142 Estate.

    AJPS.

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    thats what I mean about staying efi

    webers require tuning etc all the time and run like pigs when cold

    possibly cheaper sounds good too haha i just wanna skid

    Cheers, Ben.

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