From S-cars.org:
http://www.s-cars.org/postnuke/modul...rder=0&thold=0
"Is the hybrid K24/K26 turbo the same as the RS2 turbo?
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 o*n the smallest of the K26 series housings, with a Porsche specified 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 o*n 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 o*n 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 ******* 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 o*nly - 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.
Scott Justusson
QSHIPQ Performance Tuning"
http://www.s-cars.org/postnuke/modul...rder=0&thold=0
"Is the hybrid K24/K26 turbo the same as the RS2 turbo?
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 o*n the smallest of the K26 series housings, with a Porsche specified 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 o*n 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 o*n 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 ******* 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 o*nly - 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.
Scott Justusson
QSHIPQ Performance Tuning"
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