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Thread: 20V quads on 16V head

  1. #71
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    Adam
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    hey guys, i was just wondering if you could answer this question for me,

    im about to buy an adapter to fit 20v itb's to my 16v bigport and i dont know which one i shoul get?

    these are the two types available:

    1. The first adaptor allows you to mount the entire 20V manifold to your 4age 16V motor allowing you to maintain the driveabilty originally intended by toyota.

    2. The other adaptor requires you to remove the 20v ITBs and mount them to the adaptor and install a vacuum manifold. I would recommend the this adaptor for a FWD or turbo setup or if you need to run MAF instead of MAP thus requiring a plenum.

    i dont know if i should go with the 1st or second one? i think matt(who made this topic) went the second one?
    which one can i run with out a plenum and just have trumpets? because with the second one he says you need to install a vacum manifold?
    because the 20v quad throttle system im buying comes with the 20v manifold but i dont know if i need to fit that?

    thanks for your time.


  2. #72
    Senior Member Matt-AE86's Avatar
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    The first one is good, as you said, It has all the correct vacuum lines and stuff to run specific things like idle up, and to tap into the rocker breather etc but I would think in an AE86 engine bay you would have some clearance issues on cyl. 4 with the trumpets/stacks.

    The second one is ok, but requires a bit more of a customer setup, plumbing into it for various things is needed also, but gives more clearance

  3. #73
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    adsrx, can you post a link to each adapter you are looking at?

    id use one that goes quads - head, as otherwise you are compromising, using the shape for the 20 valve head that you dont need.

  4. #74
    Senior Member JDM-086's Avatar
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    Dario
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    hey matty is it possible for u to re upload the pics to this???

  5. #75
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    This one turns the ITB's upside down (WTG).


  6. #76
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    thinking of putting a quad on my smallport... came across the following site which provides a bolt-on Quad kit...$1600 but....


  7. #77
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    Chris
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    Just a rough price comparison to the above.

    ITBs ~$250
    T3 adaptor ~$400
    JNT Performance Trumpets ~$100
    Home Made Flanges ~$50

    Total $800 - All delivered. This is roughly what I've paid (except that I got the ITBs for free). Mine is on a bigport head, so the injectors are cast into it already, and the T3 adapter has hose attachements tapped into it so these will provide a pressure reading for the MAP sensor. Head and the rest are being machined, will have it back and complete by the end of next week.

    Regards,
    Chris


  8. #78
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    hey what do u mean by "Mine is on a bigport head, so the injectors are cast into it already"

  9. #79
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    whats he means is all 16 valve 4AGEs have the injector holes in the heads, not the inlet manifold like the 20 valve.

    those blue trumpet ones have the injectors in the quads, better for atomisation at hight revs, but i'd mount them upstream of the butterlys for that.

  10. #80
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    ohh ok, cheers

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