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

[robert weinberg]

great points. i was going to say you need to change
the maf curve with the chip, but i was babbling too
much anyway.

pro m uses resistors in the maf itself to "fool" the
computer into thinking it's the stock maf, but the
chip is the best way to go as resistors vary with age.

see ya,
Robby

--- dap128 <dap128 at hotmail.com> wrote:
> My car is definitely stronger on K04s than it was on
> K03s.  It doesn't run
> out of breath at the upper RPMs like it did with the
> K03s.  I dynoed it a
> few weeks ago and saw 305 hp and 343 lb.ft. of
> torque at the wheels
> (actually hubs, it was a dynapack dyno).
> 
> The increased lag really isn't noticeable.  In a
> highway run with a K03 and
> K04 S4 in the same gear, the K03 car might pull
> maybe 1/2 car length ahead
> initially (probably not even that much though) on
> the initial WOT
> application before the K04 car picked up steam and
> pulled ahead.
> 
> MAF sizes, the OEM MAF (both Bosch and Hitachi) are
> about 73mm at the
> sensor.  They top out at 320-330 g/sec of air (which
> is in the mid to high
> 300's horspower-wise).  The RS4 MAF is 83mm at the
> sensor.  However, you
> can't just swap out the MAF for the RS4 one without
> software changes or
> otherwise taking account of the change in airflow
> measurement.  Also, the
> RS4 MAF won't mate up to the stock airbox.  It
> requires an RS4 airbox.
> 
> The Stage 3 kits typically include a larger MAF,
> larger injectors, a fuel
> pump (depending on the kit... AWE's uses the stock
> pump) and sometimes a
> higher pressure FPR.
> 
> -Dave Pramanik
> 
> ----- Original Message ----- 
> From: "California Fields" <cfields72 at hotmail.com>
> To: <Biturbos4 at audifans.com>
> Sent: Tuesday, February 03, 2004 5:35 PM
> Subject: Re: [Biturbos4] Replacement turbos - buyin
> A6 2.7T with blown
> turbos
> 
> 
> > Dave, how much more power do you get out of just
> the K03 -> K04 upgrade
> > (i.e. keeping stock chip and other components)? 
> Or, is the power output
> the
> > same but just shifted (i.e. same hp peak but
> higher up in the rpm)?
> >
> > Cal.
> >
> >
> > >From: "David Pramanik" <dap128 at hotmail.com>
> > >To: <adam.schwartz at rcn.com>,
> <Biturbos4 at audifans.com>
> > >Subject: Re: [Biturbos4] Replacement turbos -
> buyin A6 2.7T with blown
> > >turbos
> > >Date: Tue, 3 Feb 2004 17:20:10 -0500
> > >
> > >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 -----
> 
=== message truncated ===


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