RE: years of k24

[QSHIPQ@aol.com]

Dave E writes:
>the hybrid k24/k26 is called the rs2...dave

No.  The RS2 is all k26 turbo.  I've had a couple dozen of RS2 and RS2 
Competition turbos apart in the past 6 years.  The hot side is based on the 
smallest of the k26 series housings, with a Porsche spec'd hot side wheel, 
and the appropriate milling of the housing (which results in a slightly 
larger downpipe opening).  The center section is stock audi k26 WC, and the 
cold side is a k24 cold side housing with a k26 cold side wheel.  The 
RS2/Comp both use the larger k26 shaft for the wheels.  The RS2 Competition 
uses a larger cold side wheel and housing, the hot side stays per early RS2.  
What throws most folks off, is that KKK left the k24 designation in their 
part numbers on the cold side tag. 

The actual answer to the years of the k24 cars in the US is up for some 
discussion.  The audi "claim" is that as of 1989.5 (late MC dual knock 
MAC-14) audi switched to the k24 turbo on all I5 turbo applications.  This 
switch also "supposedly" came with a revised cam profile, flat flywheel (+ 
different TOB fork), and 2pc exhaust manifold.  IME, 1990 was the bastard 
year for previous year pieces parts.  I've seen 1990's with single pc 
exhaust, k26 turbos (but all have had the flat flywheel and the revised cam 
profile).

As of 1991 + intro of the 20vt cars worldwide, all audi 20vt (I5 only - 
thought I'd miss that:) turbo cars except for the RS2, were k24 based 
turbochargers.  

Maximum boost to the k24 is altitude corrected at 16psi.  At 3200ft the 1991> 
stock 20vt cars lowered maximum boost threshold to prevent overspin of the 
turbo.  You guys with modded 20vt computers with k24 turbos should reread 
that last sentence.

HTH

Scott Justusson
QSHIPQ Performance Tuning
QSHIPQ@aol.com
'87 5ktqwRS2comp - modded
'84 URQRS2comp - modded
'87 4Runner turbo