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APR Polo - How much boost should I see?

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  • #1

    APR Polo - How much boost should I see?

    I installed my Auto meter boost gauge. Straight off intake plenum.

    I noticed the following...

    First gear boost to about 15 psi,
    Second gear boosts to about 15psi

    Third gear boost to about 17.5-18psi and occasionally boost spikes to about 20psi.

    Is this normal?

    My vaccum sits at about 20 at idle..

    My mods as follows..

    APR V1 software
    APR Downpipe and diverter valve
    Full 2.5 inch exhaust system
    SEAT intake and BMC filter.
    FMIC
    Tags: None
  • #2
    Originally posted by Petrina Polo View Post
    I installed my Auto meter boost gauge. Straight off intake plenum.

    I noticed the following...

    First gear boost to about 15 psi,
    Second gear boosts to about 15psi

    Third gear boost to about 17.5-18psi and occasionally boost spikes to about 20psi.

    Is this normal?

    My vaccum sits at about 20 at idle..

    My mods as follows..

    APR V1 software
    APR Downpipe and diverter valve
    Full 2.5 inch exhaust system
    SEAT intake and BMC filter.
    FMIC
    To be honest I would have thought 1st and 2nd would have been around the 19-20psi with those mods.

    2010 Reflex Silver MK6 Golf GTI
    Sunroof - MDI - Superchip - 19" VMR V710 - Kuhmo Ecsta SPT KU31 - VW Racing Panel Filter

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    • #3
      Software

      I believe V2 APR software has a little more boost mid range?
      Joe Chu

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      • #4
        You see less boost in first and second as the engine accelerates fast enough that it doesn't have time to build up.

        Think of boost as a measure of restriction. Pressure builds up in the manifold behind the valve, when the valve opens the pressure drops. This is happening many times a second.

        In forth gear the engine is accelerating slower and the valves are open for a shorter duration, then the boost has chance to peak higher.

        Better to think of the turbo producing airflow. Volume is more important.

        You can blow 20 PSI into a straw or a hosepipe, which will flow the most air in a given time period???

        Gavin
        optimumcode@gmail.com | https://www.vwwatercooled.com.au/for...i-;-79012.html | https://www.facebook.com/TTY-Euro-107982291992533

        Comment

        • #5
          Originally posted by h100vw View Post
          You see less boost in first and second as the engine accelerates fast enough that it doesn't have time to build up.

          Think of boost as a measure of restriction. Pressure builds up in the manifold behind the valve, when the valve opens the pressure drops. This is happening many times a second.

          In forth gear the engine is accelerating slower and the valves are open for a shorter duration, then the boost has chance to peak higher.

          Better to think of the turbo producing airflow. Volume is more important.

          You can blow 20 PSI into a straw or a hosepipe, which will flow the most air in a given time period???

          Gavin
          i like that analogy (still learning the whole car engine thing), i think ill steal it
          " I wait I resolution derive pleasure this " latest spammer post

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          • #6
            Sorry Mike every time you use it, you have to mention me and send me 50 cents. I just patented the sentence!!
            Gavin
            optimumcode@gmail.com | https://www.vwwatercooled.com.au/for...i-;-79012.html | https://www.facebook.com/TTY-Euro-107982291992533

            Comment

            • #7
              The car revs out pretty fast in first and second gear. Third gear there is more load on and more time for boost to peak..

              But are others getting similar amounts of boost? About 15psi in 1st and 2nd and around 17.5psi in 3rd, spiking up to 20psi?

              Comment

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