Throttle bodies - gap between trumpets and filter?
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Thread: Throttle bodies - gap between trumpets and filter?

  1. #1
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    Throttle bodies - gap between trumpets and filter?

    How much of a gap do i need to leave between the end of the trumpet and the filter? I've been told 25mm or the filter chokes it.

    Anyone with a 1.4/1.6 16v on tb's know what size trumpets and filters they have?

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  3. #2
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    As much space as possible.

    But I would say 25mm (an inch) at least for free airflow.
    "Undercover maniac"

  4. #3
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    ITG say 19mm minimum, 32mm preferable.

  5. #4
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    Hi mate, I have the SBD 164 kit on my corsa. The trumpets are 40mm long which is NOT ideal for performance (the 90mm ones are better) but you have to modify the bulkhead to fit the longer ones on RHD corsas so SBD supply the shorter ones with the kit. I am using the ITG filter again supplied by SBD. It does come quite close to the trumpet end, but I think I do have at least 20mm. I certainly have no complaints about the performance anyway. I had a problem fitting the filter as the alternator gets in the way. You can lower the alternator to avoid it, but my car has power steering and this makes this much more difficult. I managed to adjust the alternator position on the original mount and modified the filter backplate to suit and it just squeezes in and no more

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