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Thread: Strange boost hiss noticeable after CAI install?

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    Strange boost hiss noticeable after CAI install?

    Hi all,

    Just a bit stumped with this one.

    The car has had a revo stg1 map on it, previous owner had had this done, so fitted a revo CAI this weekend. Have been through the usual paranoia about all the extra noises it makes from the standard air box etc.

    But after taking my mechanic mate out in it, and not telling him of my suspicions he too heard this sort of flapping/ hissing noise 3.5-4k rpm it then continues to maybe the 5k area and stops, I've checked all the CAI pipes - have been done up tight etc.

    Just checked the DV, and again can't really see anything up with it (is the older diaphragm one)

    the noise seems to not be there going from a high gear 6 to 4th and going past 4k.

    probably totally unrelated but I've also noticed a burp/pop noise from the car standing still when revved. 0-2.5k rpm at 1.2k rpm every time.

    anyone have any thoughts? Can the DV be broke from no obvious signs/ tears?

    cheers,
    Adam

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  3. #2
    mjr901's Avatar
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    Quote Originally Posted by adi3390 View Post
    Hi all,

    Just a bit stumped with this one.

    The car has had a revo stg1 map on it, previous owner had had this done, so fitted a revo CAI this weekend. Have been through the usual paranoia about all the extra noises it makes from the standard air box etc.

    But after taking my mechanic mate out in it, and not telling him of my suspicions he too heard this sort of flapping/ hissing noise 3.5-4k rpm it then continues to maybe the 5k area and stops, I've checked all the CAI pipes - have been done up tight etc.

    Just checked the DV, and again can't really see anything up with it (is the older diaphragm one)

    the noise seems to not be there going from a high gear 6 to 4th and going past 4k.

    probably totally unrelated but I've also noticed a burp/pop noise from the car standing still when revved. 0-2.5k rpm at 1.2k rpm every time.

    anyone have any thoughts? Can the DV be broke from no obvious signs/ tears?

    cheers,
    Adam
    Its normal mate, answered this many times. Relax and enjoy.

    Check DV anyway, make sure its a "rev D".

    Happy Motoring.
    Boydie likes this.
    2012 Ibis Black Edition S-tronic S3, 3 Door, Shark Stage 2, MTC Intake Kit, Powerflex Fast Road Dogbone Mount, Full Non Res Milltek Exhaust, Forge Development Intercooler + DV system,
    340bhp Mikes Ibis BE 2012 S3...

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    Cheers for the reply,

    As long as its normal I can live with it. Just I've not heard anyone else's ever make that noise especially just from 3.5 - 5k rpm.

    I've ordered the revised DV, just incase.

    Cheers,

  5. #4
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    Mine made a psst psst psst sort of noise when accelerating hard in higher gears after going Stg 1 and installing a CAI. It was really obvious and started to do my head in so I removed the CAI. Glad you said the Revo CAI does it because I was thinking about buying one. Don't think I'll bother now. Can't be doing with that noise. I was convinced I had a leak somewhere but was told here numerous times its normal.

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    Yeah mines when accelerating hard when hitting 3.5-5 bracket it makes that psst noise almost like something is loose or leaking, Stange it doesnt make it going from higher to lower on mine.

    thats why I'm finding hard to think its normal, but tfsi seems to have its quirks.

    Revo CAI is a very nice piece of kit, build quality etc, just a pain to fit the air damn thing next to the headlight/ battery box..... snug fit.

    I'm going to change the DV to the newer one, so might stop that noise......... hope to not put anyone off the Revo as it is nice, although you do pay for it

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    Be patient. English is tough.

    Now:

    61 Audi S3 BE S-Tronic Ibis White: Build Thread.
    / Black Edition pack (SatNav, Bluetooth) / Parking Sensors / Tinted windows / piano inlays and finish / Cruise Control / Interior light pack /
    /Mods: REVO Stage 2+: Revo Intake / BCS Powervalve TBE system / LOBA HPFP / Crystal Clear H11 FOGS / Black roof + spoiler vinyl wrap / H&R Anti-roll bars / Superpro ALK /


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    Red, that's exactly what mine was doing when I had the CAI fitted. About that loud too.

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    mine does the same I asked revo and they say its fine checked my boost too and no over boosting between 3-4k so this is how it sounds apparently.
    Be patient. English is tough.

    Now:

    61 Audi S3 BE S-Tronic Ibis White: Build Thread.
    / Black Edition pack (SatNav, Bluetooth) / Parking Sensors / Tinted windows / piano inlays and finish / Cruise Control / Interior light pack /
    /Mods: REVO Stage 2+: Revo Intake / BCS Powervalve TBE system / LOBA HPFP / Crystal Clear H11 FOGS / Black roof + spoiler vinyl wrap / H&R Anti-roll bars / Superpro ALK /


  10. #9
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    I've got a hissing kind of sound but my car isn't mapped and not got cai on either, local specialist says its fine no leaks or anything.

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    Quote Originally Posted by RedDejavu View Post
    That's it! Maybe a little more high pitched, but definitely it.

    Glad I can relax about it, thought I could have been doing all kinds of damage

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    Quote Originally Posted by RedDejavu View Post
    mine does the same I asked revo and they say its fine checked my boost too and no over boosting between 3-4k so this is how it sounds apparently.
    Does yours sound exactly like that with the Revo intake? Do they all sound exactly the same? Thought it would just be my P-flo.

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    Quote Originally Posted by Smiffi View Post
    Does yours sound exactly like that with the Revo intake? Do they all sound exactly the same? Thought it would just be my P-flo.
    From 3.5 to 4.5/5 it does when going for it from low rpm, normal driving don't hear it, only aggressive.

    But going from gear to gear high rpm I don't hear it

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    Mine does exactly this. I thought it was maybe overboosting.
    S3 Revo Stage 2+
    Milltek Non Res-ITG-Autotech HPFP-Loba SMF

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    Quote Originally Posted by gilberto View Post
    Mine does exactly this. I thought it was maybe overboosting.
    Thats what I thought in the first place but did some logging that came up all fine so nothing to worry about:

    log.jpg
    Be patient. English is tough.

    Now:

    61 Audi S3 BE S-Tronic Ibis White: Build Thread.
    / Black Edition pack (SatNav, Bluetooth) / Parking Sensors / Tinted windows / piano inlays and finish / Cruise Control / Interior light pack /
    /Mods: REVO Stage 2+: Revo Intake / BCS Powervalve TBE system / LOBA HPFP / Crystal Clear H11 FOGS / Black roof + spoiler vinyl wrap / H&R Anti-roll bars / Superpro ALK /


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    It's the "normal" k04 tfsi compressor surge, reltively large compressor to turbine gives very quick spool and the engine isn't capable of consuming it at the same rate. Remember boost is the product of the engine being unable to consume the given flow.

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    Anyone happen to know which intake disguises this noise the best? It was really pronounced with my P-Flo. I always hoped it would have a deeper throatier noise.

    Doesn't it annoy anyone else? Maybe I need a non res Miltek to drown it out!!!

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    Vw r intake is by far the best intake IMO I've had revo and itg... The vwr is quiter by far a better noise and along with stage 2 and bcs exhaust it's awsome to the ear it's even producing turbo chirp via the exhsust (that's my experience thanks to aks tuning)

  19. #18
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    VWR intake is the quietest but doesnt fit very well giving a lot of rubbing that forces you to move lines around a bit.
    Be patient. English is tough.

    Now:

    61 Audi S3 BE S-Tronic Ibis White: Build Thread.
    / Black Edition pack (SatNav, Bluetooth) / Parking Sensors / Tinted windows / piano inlays and finish / Cruise Control / Interior light pack /
    /Mods: REVO Stage 2+: Revo Intake / BCS Powervalve TBE system / LOBA HPFP / Crystal Clear H11 FOGS / Black roof + spoiler vinyl wrap / H&R Anti-roll bars / Superpro ALK /


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    In the right hands that bad boy fits a treat even with the tts cover

  21. #20
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    Quote Originally Posted by g dawg View Post
    In the right hands that bad boy fits a treat even with the tts cover
    mine didnt was rubbing against the tts cover, some plastic bits and water lines which all need to be trimmed to fit. Not something that you would expect for over £400.
    Be patient. English is tough.

    Now:

    61 Audi S3 BE S-Tronic Ibis White: Build Thread.
    / Black Edition pack (SatNav, Bluetooth) / Parking Sensors / Tinted windows / piano inlays and finish / Cruise Control / Interior light pack /
    /Mods: REVO Stage 2+: Revo Intake / BCS Powervalve TBE system / LOBA HPFP / Crystal Clear H11 FOGS / Black roof + spoiler vinyl wrap / H&R Anti-roll bars / Superpro ALK /


  22. #21
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    Quote Originally Posted by RedDejavu View Post
    Thats what I thought in the first place but did some logging that came up all fine so nothing to worry about:

    log.jpg
    Thats good to know although I've no idea how to interpret that information. Ha ha
    S3 Revo Stage 2+
    Milltek Non Res-ITG-Autotech HPFP-Loba SMF

 

 

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