<VV> Early vs. Late turbos

[Jim Simpson]

Not trying to fan any flames over the early vs. late wars, but the early 
turbos used a smaller turbine and compressor.  As a consequence, it will 
spool up more quickly and particularly with the smaller displacement engine 
give (some) boost in the lower gears.

On the other hand, the late turbo flows more.  It doesn't necessarily 
produce more boost but is a good match to the 164 cu in engine.

Find me at the Lexington convention -- I'm bringing some data plots from 
some instrumented runs I made on my '66 Corsa turbo.  I instrumented the 
engine to read out and record manifold pressure, air/fuel ratio, throttle 
position, and RPM.  I do get some boost in first -- just barely, but some 
-- and then come on fairly strongly in the upper three gears.  Peak boost 
is ~10.5 to 11 psi.

This is on basically a stock engine -- Carter YH, stock turbo, 0.040 
overbore, stock cam, etc.  The data plots are interesting and informative.

Jim Simpson, Group Corvair, Marine Blue '66 Corsa coupe.