I used to drive an '85 5000S T (non-quattro.) I was quite satified with its
turbo power until I wrecked it about two months ago. In searching for
a new car, I test drove two '87 CS T and realized that their performance
seemed worse than my the '85 turbo I used to have. Looking at
the engine, I saw that the turbo's on these '87's are smaller than that
in my old '85. Is this true for all '87 5000S T ? I haven't been able to locate
an '88 turbo, so I can't coment on it.
The "smaller" turbo might not be the cause of the
perceived difference in performance. The Ur Quattros came
with *WAY* oversized turbos for street use. When I upgraded
my Ur Quattro to the *smaller* S4 water-cooled turbo there
was an enourmous increase in performance. Now the boost
come up at 2500 RPM and there is a 1000-1500 RPM wider
power band with mucho more torque down low. Smaller can =
better if properly engineered for the application, in this
case street performance and not powerband from 5000-8000
RPM like you might want in a rally/race setup.
The difference you saw is likely due to some other factor.