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

[robert weinberg]

of course i'm just talking out my ass here (i'm a
total benchracer), but what about a single turbo
conversion?

does the engine really need two turbos? what about a
really efficient single turbo and i'm not talking
single turbo supra size.

Robby

--- David Pramanik <dap128 at hotmail.com> wrote:
> The K04s are large enough to handle increased boost
> without much worries of
> turbo failure.  Very few problems are reported with
> the K04s, which are
> right in their efficiency range at chipped boost
> levels and even slightly
> beyond.  The K03s are pushed to their limits by
> chips (and are even known to
> fail on stock boost).
> 
> There are a number of reasons for not using turbos
> larger than K04s on the
> 2.7T.  The most obvious is space limitations.  You
> simply can't fit anything
> bigger than a K04 (K04/K16 hybrids are being used in
> some cases, but the
> housing from the K04 is used so it fits).  Also, the
> larger the turbo gets
> the more the lag will be.  S4s are so much fun due
> to the low end torque
> (from quick spoolup).  Give up too much of that and
> the car won't be as fun
> to drive.  Lastly, You are using exhaust from 1.35 L
> of the engine (1/2 of
> 2.7L) to drive each turbo.  If you use too large of
> a turbo, there won't be
> enough exhaust gas to spin the turbo as fast as
> necessary to make the
> desired boost.
> 
> -Dave Pramanik
> 
> ----- Original Message ----- 
> From: "robert weinberg" <centaurus3200 at yahoo.com>
> To: "David Pramanik" <dap128 at hotmail.com>
> Cc: <Biturbos4 at audifans.com>
> Sent: Tuesday, February 03, 2004 4:26 PM
> Subject: Re: [Biturbos4] Replacement turbos - buyin
> A6 2.7T with blown
> turbos
> 
> 
> > 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
> > > > -- 
> > > >
> > > > some of you know i am lurking on this board
> > > > researching A6 2.7T as my potential next car
> > > (along
> > > > with the 540i 6 speed). well, what about
> buying an
> > > A6
> > > > 2.7T with blown turbos wholesale. either
> private
> > > party
> > > > or from a dealer that just wants to get rid of
> it.
> > > > then put a K04 upgrade on it and be happy?
> > > >
> > > > am i dreaming? what do you guys think?
> > > >
> > > >
> > > >
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=== message truncated ===


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