K04 spool/surge

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s4rmm

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	K04 spool/surge « on: June 30, 2011, 07:08:40 AM »

Have anyone ever heard that RS4 K04s can surge on S4?

I'm hearing strange sound what's very much like compressor surge for the short period when logging and going WOT from low revs.
It occurs around 2800-3500rpm.
I get 15psi from 2700-2750, then 19-20 psi around 3000 and 22+psi above 3300rpm (using 3rd gear).

Is it really possible that boost builds up too quickly and engine can't consume that air?

Does anybody with K04 S4 have block 115/118 logs to compare?

Thanks.


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judeisnotobscure

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	Re: K04 spool/surge « Reply #1 on: August 05, 2011, 04:27:25 PM »

that seems about normal to me.


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I have a b5 s4
but i just want to dance.

Jason

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Breaks everything!

	Re: K04 spool/surge « Reply #2 on: August 10, 2011, 09:17:20 AM »

Are you talking about a high pitched shrill when at high load in mid range? If so that's normal.


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judeisnotobscure

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	Re: K04 spool/surge « Reply #3 on: August 11, 2011, 09:30:38 AM »

I was referring to the psi at certain rpms... he should post a sound clip of the sound. dentist drill sound of dying turbo is very hard to miss. If you aren't sure, then it's not the dentist drill sound.


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I have a b5 s4
but i just want to dance.

s5fourdoor

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	Re: K04 spool/surge « Reply #4 on: August 11, 2011, 11:57:43 AM »

another common sound of broken turbos is a nasty rattle which sounds like something is in the cats. make no mistake, that would be your wastegate... but again
dentists drill
baby rattle
you can't mistake them. if its not definitely those, they are likely fine...


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s4rmm

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	Re: K04 spool/surge « Reply #5 on: August 12, 2011, 04:34:14 AM »

No, it's not dentist drill and dying turbo. I had it with K03s, completely different.
I'm afraid you can't hear it on sound clip, at least when it's recorded with my phone.
I think it is surge, my question was, is it possible with K04s?
I was hoping someone would post logs to compare how quickly boost is rising.


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Gonzo

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	Re: K04 spool/surge « Reply #6 on: November 23, 2011, 11:06:16 AM »

You can't have any real surge unless you are starting out in 4th gear or something.


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carlossus

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Leon Curpa Stg1+

	Re: K04 spool/surge « Reply #7 on: November 23, 2011, 02:13:25 PM »

A leaky / loose manifold gasket pre-turbo can scream like a reed under high boost. As can a cracked manifold - but that's fairly distinct also.


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Drludlow

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	Re: K04 spool/surge « Reply #8 on: November 28, 2011, 02:45:48 PM »

Hooting sound? Does the rmm in your screen name mean Rocky mtn. If so its a pain at altitude, doesn't happen till 24-6ish at sea level. Varies from car to car. Yup can surge, and the intermitent part is the surge bouncing back and forth between each turbo.

Quote from: s4rmm on June 30, 2011, 07:08:40 AM


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