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Thread: Reducing id size of vac pipes?....

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    Default Reducing id size of vac pipes?....

    Just wondering if reducing the id size of the vac hoses would be better? Im currently running 4mm but thinking of trying out 2mm mabe, anyone got any thoughts or tried doing this cheers

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    In theory less area means less volume of the pipe, so the less the vacuum pump has to work, however I doubt it would work. My motor has the vacuum box in the effective between the vacuum pump and turbo. I bypassed this as a trial and to no avail - and trust me it was a lot pipework that was bypassed. So practically I would say it's pointless.

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    or you could look at it this way, you try sucking through a straw the size of a needle or through a straw like McDonald, which is easier?
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    Cheers for the feedback guys, dont think i'll bother, just kinda at the point where im looking too hard for things to do to the car lol

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    Quote Originally Posted by plasma View Post
    or you could look at it this way, you try sucking through a straw the size of a needle or through a straw like McDonald, which is easier?
    Tbh bud I think the nozzle on the pump is about 2mm. Although dean you can kick me if i'm wrong bud.

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    Quote Originally Posted by plasma View Post
    or you could look at it this way, you try sucking through a straw the size of a needle or through a straw like McDonald, which is easier?
    Best answer IMO : Reducing the ID could only have a negative effect. I feel that aside from 'purposeful' limiting of the car, or limits imposed by emissions regs,, then the manufacturer and designers are in a much better position to judge what sort of i.d. of pipe should be in use than we are. While some engines and options are added to restrict engines I feel that these are in the minority and most "MODS" such as the "Air Box Mod" have little or no benefit and probably have more of a placebo effect on the people who do them. After all who wants to admit they just spent a few hours and a lot of effort destroying their airbox for no gain. Time after time the results and reports are the same. "Well it feels better I think".... never a "it is much better" or "Do it I know you will see the difference". Why does no one sand by this mod? Well to me its clearly because the difference, if indeed there actually is a positive one is so small that it is not noticeable and I would think altering the ID of the Vac pipes would be similar

    All IMO :-)

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    Quote Originally Posted by GazCDTI150 View Post
    Tbh bud I think the nozzle on the pump is about 2mm. Although dean you can kick me if i'm wrong bud.
    Gaz, i believe your right.
    Although i'm not sure what engine you have rich have a 2.0DTi with 2mm I.D vacuum pipes and i have had no problems at all infact 4mm is too big i think. I have seen a thread by Innes confirming 2mm too.

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    Can someone help me with how this can in any way help, apart from on a car that is in some other way defective. The vac pipes simply operate valves (as i understand it) and the pressure is propositional to the area so surely the optimal pressure to area was set at manufacture? Altering this by increasing vacuum with a wider pipe or decresing vac with a narrower one would alter the manufacturers standards and so therefore would be a mod for new perfectly working cars if it actually helped? I can't see that even if this helped in a theoretical sense that it would translate to the real world because the ECU is programmed to expect certain valve movements for certain vacuum pressures,, surely!!. If it can help I am going to do mine so please help me understand this debate!

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