Turbo gurus...Help?

Brandon Rogers brogers at terrix.com
Thu Jan 25 11:13:46 EST 2007

Were it me, I'd swap the downpipe for a stock one - now, one thing - the
K26 sand K24s I've seen all bolted up no problem to the same downpipe -
same bolt pattern.  I wonder if you have something else going on - or
maybe I'm misunderstanding your post...

Anyway K26 vs K24 - can be debated til you turn blue.  But here's my
opinion - Audi went to the K24 after years of using the K26.  Yes the
K24 is smaller but it boosts faster, and is a "newer," more efficient
design, in my understanding.  Personally I'd stick with the K24...unless
you decide to go with a truly modern turbo -

'84 urquattro 20Vt
'01 S4

-----Original Message-----
From: 200q20v-bounces at audifans.com [mailto:200q20v-bounces at audifans.com]
On Behalf Of Eric Huppert
Sent: Wednesday, January 24, 2007 7:03 PM
To: 200q20v; quattro at audifans.com
Subject: Turbo gurus...Help?

Screwed again... Never fails!

Been having some oil smoke at cold idle and decided to finally swap out
the turbo on my 200 20V. (does have some endplay)Picked up a good K24
and was pulling mine when I noticed the exhaust flange was smaller on
the one I picked up...

Seems that one of the two previous owners had the turbo replaced with a
K26 (vs. the stock k24) and had a K26 flange welded on the exhaust. They
did a nice job, I never even noticed the weld until now....ARGH.

So, based on info below do I just put another K26 in or do I find a K24
head pipe and install the one I got. I can exchange the K24 for the

ECU will be chipped, already have them but wanted to straighten out the
oil issue prior to installing them. Also have the SAMCOs and clamps...

Am I shortchanging myself by installing the K26?



Remembered reading in the Wiki info from Ned Ritchie

 Subject: K26 turbo

The compressor wheel size determines quantity and pressure.

The K26 having a larger wheel can produce more pressure, but supplies
less air as the smaller portion of the wheel, the inducer, the part that
you see with the blades, is Smaller than that of the K24, and therefore
a restriction.

The turbine, the hot end, on the K26 can exhaust air for 430 hp, but the
compressor falls way short of that monumental task. With such a free
flowing exhaust the turbine does not spool up quickly, and when it
finally does the compressor intake is too small.

So the K26 will not make you a happy driver.

The RS2 has the same diameter compressor wheel AND a larger than stock
inducer. It also has a smaller than K26 turbine exhaust, but not as
small as the stock K24.

It is a better balanced turbocharger for higher horse power, but nothing
beats the stock turbo for quick around town stop & go driving.

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