KKK RS2 race turbo charger

[QSHIPQ at aol.com]

I'm not sure I agree with that statement Dave.  It would depend on what the
application is.  IME, the RS2 turbo on the 2.1L urq would plain suck, and the
k24 unit is much better matched in terms of spoolup and output (BTDT).  The
RS2 turbo on the 2.2/2.3 liter motors *can* be a different story.  I've run
RS2 turbos on 10vt cars for 8years now, and with some attention to the
application, it can be a fine "all around turbo", and far outperforms the
k24.  Currently, my '87 t44tqw runs the RS2 (7200 comp), and my 83 urq runs
the k24.  I've also installed 15 or so of the RS2/7200comp in a variety of
20vt applications.

Here's my thoughts on the RS2 in the 10vt application.  The RS2 chokes on the
stock exhaust, a 3in turbo back makes a great addition.  Minimally the RS2
needs a single pass IC, ideally a biger IC.  The RS2 will *kill* the CIS
meter without a bypass valve install (btdt).  Larger exhaust valves help the
RS2 turbo spool up faster.  The RS2 can run a constant 22psi at a really high
efficiency, the K24 is beyond peak, and can only run this for short burst.
The RS2 needs to be agressively WG controlled at lower boost levels, as it
tends to cause Wastegate Cracking that will slow the spoolup noticeably.

WRT the RS2 turbo in the 20vt application.  The RS2 exhaust cam helps low end
greatly.  So does the 3in turbo back exhaust system.  The 91 200 with the RS2
stuff on it just smokes the k24, btinstalledthat.  I think the reasoning is
that the 91 200/urq is the only 20vt application without the dual mass
flywheel.  That dual mass really dogs off the line.

The RS2 turbo power output exceeds the k24 by 2250rpm (from your own comparo
chart Dave).  Although you 'own' both, a direct comparo to your two
applications isn't fair.  The RS2 has a serious weight disadvantage to the
urq, and the urq has a much lighter reciprocating mass.  Since you run both
cars in stock trim, I too might conclude the k24 is a better driver.
Tweeking either car, the RS2 turbo give the 24 a hard punt.

My .02
Scott Justusson
QSHIPQ Performance Tuning
'87 t44tqw - RS2 turbo
From: David Eaton <deaton at tranzrail.co.nz>
To: "'quattro at audifans.com'" <quattro at audifans.com>
Subject: RE: KKK RS2 race turbo charger
Date: Fri, 7 Jun 2002 08:31:30 +1200

it doesn't come close to a k24 - which is a far better around town unit than
the rs2 turbo.  there is no way i would say that the rs2 turbo has "minimal
turbo lag".

dave
'95 rs2
'90 ur-q