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  1. #1

    Is the Throttle Body and Intake Manifold a restriction on 4tecs

    Looking at the turbo setup on US performance Makes the stock manifold look dinky.

    That Aluminum manifold looks cavernous which gets me thinking.

    Many guys on this site are using 4 inch intakes to the SC to maximize the volume of air to that point. Then the air has got to sneak past the Throttle body which is about 2 and a half or so inches (correct me if i'm wrong)

    For most of us probably won't be able to afford a turbo set up.

    Can we expect gains with a HUGE intake manifold like this in combo with larger throttle body?

    Cars have big bore TB's and also extrude honing done on the intake manifolds to increase the volum of air to the engine. Can the same principle be applied to the 4tecs with some modifications and keep with the SC's instead of turbo.

    Any thoughts guys?


  2. #2

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    We're not storing compressed air, we try to push it into the head.

  3. #3
    got it jawz. so there is no true advantage with a supercharger to increasing the volume of the intake manifold.

  4. #4
    Prohibido usuario
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    You would have to increase the physical size of the sc. If the area after the sc increases in size then the boost pressure would decrease. you can do that with the turbos because of the insane amount of boost they are creating.

  5. #5

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    After taking the stock intercokker out last night I now understand why it is a serious restriction!!!!!!!!!!!!!!!!!!!!!OMG

  6. #6
    EZ Dock of Long Island Shibby1485's Avatar
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    the air going into the manifold is cooler and denser obviously... 2.5 inch TB appx....

    exhaust.... hot air is greatly expanded... the j-pipe inner pipe is what... like 2 inches?

  7. #7

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    Quote Originally Posted by NCHeel View Post
    You would have to increase the physical size of the sc. If the area after the sc increases in size then the boost pressure would decrease. you can do that with the turbos because of the insane amount of boost they are creating.
    have you got a turbo ?

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