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

[adam.schwartz at rcn.com]

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
>> > -- 
>> >
>> > 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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