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Thread: Throttle body small port to RWD big port manifold

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    Member grey_nomad's Avatar
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    Default Throttle body small port to RWD big port manifold


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    Would a small port FWD throttle body fit a RWD big port manifold?

    Also, will the big port TPS fit on the small port throttle body? The connectors are different.

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    yes.

    and yes, but need the connector to go with it.

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    Thanks xero.

    Throttle shaft broke on the big port during Ararat hillclimb yesterday. I can borrow a small port throttle body from my son until I sort mine out, and just wanted to know if it fits.

    Cheers

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    It will fit, but not function properly. The breather port on the fwd t/b is on the oposite side to a rwd t/b. There for it will be blocked, and any crankcase pressure will blow anything out (usually your dipstick and a lot of oil with it). If you run a catch can it will be ok, otherwise you need to place the breather hose pre t/b.

    Now with tps. Yes and no is the answer. Dependant on a few things:
    If the smallport t/b is off a JDM engine and the tps came off a rwd bigport or jdm fwd bigport, then it will fit.
    If the smallport t/b is off a JDM engine and the tps came off a fwd adm bigport it will not fit and needs the adaptor butterfly wings swapped over.
    If the smallport t/b is off an ADM engine and the tps came off a fwd adm bigport it will fit.
    If the smallport t/b is off an ADM engine and the tps came off a rwd or jdm fwd bigport it will not fit and needs the adaptor butterfly wings swapped over.
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    Thanks Nikkojoe - great info.

    Breather hose pre-throttle body is no problem. Mind you, this is only a temporary fix until I can get hold of another JDM RWD throttle body.

    By adaptor butterfly wings, do you mean the metal prongs on the non-cable end of the throttle shaft that engages the TPS?

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    Yep, the TPS drive metal piece.

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    don't run the breather hose pre throttle, you will end up with gunk and grime which will clog up the throttle body. my car (smallport) was set up like this when i got it and took me ages to clean the throttle body properly...

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