<VV> Re: Turbo Setup

[RoboMan91324@aol.com]

Thanks Frank and Seth.  There is nothing like showing my ignorance in front 
of a bunch of people.  I must admit that my only experience with turbos is with 
my '64 Spyder and my '66 Corsa.  I am not all that familiar with the more 
modern turbos.  I was thinking of blow through and fuel injected systems.  This 
is yet another reason that I value VV.  I learn something new nearly every day.

Thanks again,
Doc
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In a message dated 11/17/2004 5:46:02 PM Pacific Standard Time, 
fparker@umich.edu writes:
No, wastegate is teed into the exhaust tubing before the turbine inlet and 
bleeds off any excess exhaust that would cause overboost. It is critical to 
modern turbo performance. Virtually ALL turbos in the last 20 yrs use either an 
internal ot external wastegate. You need the proper turbine section to work 
well. That why , if u are going to use the old vair turbos, I suggest you ask 
Warren since he has done it and can tell use the best combination of stock turbine 
and compressor and carb to use. With a wastegate, u can have good boost in 
1st gear. Without a wg, on a stock system, if u bought a Rajay turbine section 
of smaller a/r cross section to give u 1st gear boost, it would overboost in 
the higher gears-possibly 15-20 psi busting parts. The wg vents this excess 
exhaust using a bypass back into muffler. Sounds like a free lunch, but it is not 
cause there will be more turbine backpressure. It is a serious task to figure 
out the best turbine to use or one has to try one, test results and pick the 
best a/r.

regards,

frank