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2.5TDi Dumping Boost / Compressor Surge

Discussion in 'A4/A4 cabriolet/S4 forum(B6 chassis)' started by AlexGSi2000, Oct 15, 2012.

  1. AlexGSi2000
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    AlexGSi2000 Active Member

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    Just wondering if anyone could help me out on this one, as the car seems to be dumping boost under full load.

    I was having a spirited drive around the country roads last night, under full load lower down the revs (around 2,500-3000rpm) the car was dumping boost and giving the sound of compressor surge, then picking back up again.

    The car has a remap, full stainless exhaust and had the EGR blanked - Is it likely to be the N75?
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  2. AudiAndy21
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    AudiAndy21 Member

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    mine used to do this mate but... never made a difference to performance? can you tell on yours?

    i had an open filter ( cone) so you could realy hear it
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  3. adamss24
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    adamss24 Active Member

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    Either a crap map or the air intake pipe is collapsing- had the same issue on fjtwelve's remapped audi a6. Thought it was fuel starvation at first. Any fault codes ?
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  4. AlexGSi2000
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    AlexGSi2000 Active Member

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    Intake pipe collapsing! - nice... I haven't spotted any aftermarket TIP's for the 2.5, guessing I will just have to live with it?

    No fault codes whatsoever!
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  5. swarcup
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    swarcup Active Member

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    can i ask what happens when you say dumping boost, just in case mine does this and im unaware
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  6. AlexGSi2000
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    AlexGSi2000 Active Member

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    Sorry, my own terminology there - the turbo stops providing boost pressure and then re-builds.

    This is the sound im getting, but under full acceleration - SR20DET Compressor Surge - YouTube
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