[Biturbos4] Replacement turbos - buyin A6 2.7T with blown turbos

Tue Feb 3 17:41:18 EST 2004

>From what I understand, the stock fuel pressure regulator (and injectors?) 
are maxed out (in addition to the MAF) with K04s and a chip....so you run 
too lean. However, K04s with a stock chip works OK because the amount of 
fuel needed at max boost is still within the capabilities of the stock FRP 
and injectors.

Cal.

>From: robert weinberg <centaurus3200 at yahoo.com>
>To: Biturbos4 at audifans.com
>Subject: Re: [Biturbos4] Replacement turbos - buyin A6 2.7T with blown 
>turbos
>Date: Tue, 3 Feb 2004 14:33:02 -0800 (PST)
>
>what is the diameter of the stock mafs? there are two,
>correct?
>
>you can dial in more fuel (via chip or af-c) so you
>wouldn't run lean, but airflow is important obviously.
>
>in the world of boosted SHOs, i have never seen a
>highly tuned one (450 wheel hp and way above) without
>being tuned on a dyno. but, then again, i haven't
>heard of too many chipped 2.7Ts munching the rings
>either. so, maybe detonation isn't that big of a
>problem with the bosch motronic.
>
>Robby
>
>--- David Pramanik <dap128 at hotmail.com> wrote:
> > The K04 is slightly larger in terms of the housing
> > size than the K03.  And
> > you are right, the K04 is more geared towards higher
> > boost, higher RPM
> > applications than the K03s with are for low end
> > torque.
> >
> > Putting K04s (and inlet pipes since the K04 inlets
> > are larger) into an
> > otherwise stock S4 would work fine.  There would be
> > slightly increased
> > airflow at the same boost levels, but the stock
> > fueling system can more than
> > compensate for that (it meters fuel based on the
> > incoming airflow).  I am
> > presently running K04s on a standard K03 chip with
> > no problems.  I am at the
> > upper limit of the MAF and fueling system, but I'm
> > not running overly lean.
> > If I increased the boost, I would be, hence the
> > requirement for larger MAFs
> > and injectors with the complete K04 kits (which run
> > more boost than than the
> > K03 chips do).
> >
> > -Dave Pramanik
> >
> >
> > ----- Original Message -----
> > From: <adam.schwartz at rcn.com>
> > To: <Biturbos4 at audifans.com>
> > Sent: Tuesday, February 03, 2004 4:53 PM
> > Subject: Re: [Biturbos4] Replacement turbos - buyin
> > A6 2.7T with blown
> > turbos
> >
> >
> > > Hi,
> > > I think K03 and K04 turbos are about the same age
> > in terms of
> > > design.. And I dont think the K04 was intended to
> > replace the
> > > K03.
> > >
> > > I have seen both side by side and the K04 impeller
> > diameter
> > > is larger, but very slightly. They are intended
> > for higher
> > > boost applications.
> > >
> > > Here is a good pic of the 2. The K04 is on the
> > right
> > >
> > >
> > http://www.audiworld.com/news/99/turbo/lo4lko4r1.jpg
> > >
> > >
> > > In theory, if you put a K04 into the S4 and drive
> > it at or
> > > slightly over the standard boost of a stock S4,
> > the turbo
> > > could last longer because it isnt being pushed as
> > close to
> > > its limmit - But I have heard that if you dont
> > make a bunch
> > > of other changes, and just put in the K04 chip
> > your mixture
> > > will be off... Is it lean? Maybe someone could
> > talk about
> > > what the minimum requirement is to replace the K03
> > with K04's
> > > in terms of other parts needed...
> > >
> > > Adam
> > >
> > >
> > > ---- Original message ----
> > > >Date: Tue, 3 Feb 2004 13:26:28 -0800 (PST)
> > > >From: robert weinberg <centaurus3200 at yahoo.com>
> > > >Subject: Re: [Biturbos4] Replacement turbos -
> > buyin A6 2.7T
> > > with blown turbos
> > > >To: David Pramanik <dap128 at hotmail.com>
> > > >Cc: Biturbos4 at audifans.com
> > > >
> > > >so, what is the benefit of the K04? i understand
> > they
> > > >are slightly larger. but it seems wierd KKK would
> > have
> > > >too very similarly sized turbos. do you think,
> > more
> > > >likely, that the K04 is a revised and tougher
> > version
> > > >of the K03? maybe admitting the problems with the
> > K03?
> > > >
> > > >will the K04s infact last longer and end this
> > whole
> > > >blown turbo problem?
> > > >
> > > >hey, why don't i throw some K24s on the 2.7T
> > motor?
> > > >;-) kidding, aren't those the twin turbo porsche
> > > >turbos?
> > > >
> > > >Robby
> > > >
> > > >--- David Pramanik <dap128 at hotmail.com> wrote:
> > > >> K04s are (slightly) larger than the stock K03s.
> > > >> They don't spool up faster,
> > > >> but the size difference is pretty small so the
> > > >> increase in lag is probably
> > > >> less than 500 rpm.  Peak torque will be higher
> > with
> > > >> a K04 due to higher
> > > >> boost/more airflow, but it will be delayed
> > slightly
> > > >> due to the small
> > > >> increase in lag.
> > > >>
> > > >> -Dave Pramanik
> > > >>
> > > >>
> > > >> ----- Original Message -----
> > > >> From: "Michael Benno" <mbenno at yahoo.com>
> > > >> To: "David Lau" <toomanycars at mac.com>; "robert
> > > >> weinberg"
> > > >> <centaurus3200 at yahoo.com>
> > > >> Cc: <Biturbos4 at audifans.com>
> > > >> Sent: Tuesday, February 03, 2004 12:43 PM
> > > >> Subject: Re: [Biturbos4] Replacement turbos -
> > buyin
> > > >> A6 2.7T with blown
> > > >> turbos
> > > >>
> > > >>
> > > >> > Your points are very good. The list is not a
> > > >> proper maket representation.
> > > >> >
> > > >> > However, regarding your comments on the spool
> > up
> > > >> time of the K04 vs.
> > > >> K04...Most people (on Audiworld) who have done
> > the
> > > >> conversion to K04 claim
> > > >> much faster spool up times. I can't say much
> > about
> > > >> the torque but mathmatics
> > > >> would lead me to believe that torque is
> > directly
> > > >> related to boost, so that
> > > >> must be higher too. To be honest I really don't
> > know
> > > >> the mechanical
> > > >> differences between the two.
> > > >> >
> > > >> > Anyone care to enlighten me?
> > > >> >
> > > >> > Mike Benno
> > > >> > a6 2.7t MTM1
> > > >> >
> > > >> >
> > > >> > David Lau <toomanycars at mac.com> wrote:
> > > >> > Sounds like a plan to me, Robby, you may
> > never go
> > > >> back to the SHO!
> > > >> >
> > > >> > But I do think the K03 problems are out of
> > > >> proportion on this list. What
> > > >> > percentage of biturbo owners worldwide are on
> > this
> > > >> list, maybe 5%? and
> > > >> what,
> > > >> > 10% of us have had failures? Total guesses,
> > you
> > > >> understand. And we're
> > > >> harder
> > > >> > on them than most, chipping and all, yet
> > probably
> > > >> maintain them better
> > > >> too,
> > > >> > so that may wash. (How many average owners
> > even
> > > >> THINK about that cold,
> > > >> thick
> > > >> > oil squeezing through those tiny passages at
> > > >> startup?)
> > > >> >
> > > >> > I've heard the K03s were designed for torque,
> > not
> > > >> feindish horsepower
> > > >> > anyway. Being small, they spool quickly, and
> > give
> > > >> full rated (stock)
> > > >> torque
> > > >> > at only 1800rpm. High rpm, sure, they run out
> > of
> > > >> cfm to maintain high
> > > >> > boost...
> > > >> >
> > > >> > David
> >
>=== message truncated ===
>
>
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