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Author Topic: Dumping boost on throttle  (Read 2703 times)

Offline stacy2704

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Dumping boost on throttle
« on: February 21, 2017, 09:46:44 pm »
Hi guys, I seem to be having a possible boost issue. so when i floor it, it sounds like the recirc dumps and then a sort of puffing sound like a steam train. I always thought it felt a little flat but i put it down to being used to more poweras my last car was a mapped focus st. it was only since putting an induction kit on i noticed the noise. sadly i dont have vagcom so cant do a log i just wondered if anyone has had the same thing? i do have the management light on for incorect flow on the evap purge valve but im not sure how that could be related.

Offline stacy2704

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Re: Dumping boost on throttle
« Reply #1 on: February 21, 2017, 10:14:22 pm »
also im running a rev g fitted a couple of months ago and have replaced the MAP sensor

Offline pudding

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Re: Dumping boost on throttle
« Reply #2 on: February 23, 2017, 03:09:53 pm »
What engine is it?  GTI K03 or Edition 30 K04?  Is it remapped or standard?

You will hear a lot more noises from an induction kit but you shouldn't be hearing any fluttering noises unless the turbo runs into surge.  Remapped KO4 engines often do that at specific boost pressure and rpm (usually around 3000).


2007 ED30 | 2009 TDI 140 | 2016 BMW 330D

Offline stacy2704

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Re: Dumping boost on throttle
« Reply #3 on: February 23, 2017, 06:31:17 pm »
its an AXX K03 with standard map

Offline AJP

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Re: Dumping boost on throttle
« Reply #4 on: February 23, 2017, 07:15:07 pm »
Could be the N75 valve. I think there's a way of testing it manually, but you really need to get hooked up to VCDS. It'll save a lot of messing about.

Offline stacy2704

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Re: Dumping boost on throttle
« Reply #5 on: February 27, 2017, 10:48:16 pm »
so i did boost logs but they dont look very good..

Offline bradh

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Re: Dumping boost on throttle
« Reply #6 on: February 28, 2017, 06:57:17 am »
I had similar turned out i had a slightly leaking boost pipe would dump pressure around 3k then build back up

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Offline stacy2704

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Re: Dumping boost on throttle
« Reply #7 on: February 28, 2017, 07:12:51 am »
was it one of the seals on the pipes? i suspect after 12 years mine may be past their best

Offline pudding

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Re: Dumping boost on throttle
« Reply #8 on: February 28, 2017, 03:26:38 pm »
Oil patches on the under tray is a good sign of that happening.



2007 ED30 | 2009 TDI 140 | 2016 BMW 330D

Offline stacy2704

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Re: Dumping boost on throttle
« Reply #9 on: February 28, 2017, 08:27:21 pm »
thing is im sure it opens the recirc on full boos t so i cant see the seals being the main or only culprit

Offline bradh

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Re: Dumping boost on throttle
« Reply #10 on: February 28, 2017, 09:59:11 pm »
I replaced the pipes with aftermarket silicon hoses fresh seals no issues since 3 weeks ago I did it


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