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

[robert weinberg]

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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