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

Tue Feb 3 17:03:46 EST 2004

A lot of people notice that the 1.8t and 2.7t (both with K03) seem to run out of steam at ~5500 rpm, well before the redline, this is due to the inefficiency of the smallish K03 unable to push anymore air at higher engine speed.  The K04 on the other hand is designed to operate at higher engine speed, not to mention higher air flow capability, hence, it will continue to push air and maintain boost all the way to redline.  Essentially the K04's operating range is shifted upward compared to the K03, and it is capable of higher flow.   

The reason that people say K04 is more reliable is because it doesn't need to work as hard as the K03 to achieve the same level of boost, hence you don't push them to the limit as often.  Throw a chip to the stock engine, the K03's are now operating at the upper limit of their efficiency range, hence they self destruct much easier.

They main reason why we haven't heard many turbo upgrade pass the K04 is due to the physical space inside the tight b5 engine bay.  Also as I mentioned in my other post, both K03 and K04 have identical exterior dimensions, hence make it easy (relatively..) to swap for K04s.  Any bigger turbos simply won't fit in the engine bay.  However there are people and tuners out there working on other "bigger" turbo upgrades, but they definitely need some creative solution to find more space for them.

Quincy

----- Original Message -----
From: robert weinberg <centaurus3200 at yahoo.com>
Date: Tuesday, February 3, 2004 2:26 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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