<VV> Turbo Setup

[RoboMan91324@aol.com]

Gentlemen,

I have been following this train with great interest as I am building two 
turbos.  As far as waste gates, it is my understanding that they are not 
practical on the existing Corvair setup because the carb is upstream in the flow.  As 
I understand it, a waste gate needs to be between the compressor and the point 
where fuel enters the system otherwise, you will be venting air/fuel mixture. 
 That would get interesting pretty quickly.  If I understand things, you 
would need to change pretty much all of the Corvair intake components to do this 
as well as mods to the exhaust side of things.  Am I correct?  As I see it a 
reasonable compromise between the stock unit and an intercooler is the addition 
of a water/alcohol injector.

Norm, my personal opinion on the pistons is that it is a good idea to use 
forged or hypereutectic pistons in a 164 cid engine that may see heavy use.  This 
would include turbos as well as 140s.  This is cheap insurance especially if 
you are replacing the pistons anyway.  JMHO

Doc
~~~~~~~~~~~
In a message dated 11/17/2004 3:00:16 PM Pacific Standard Time, 
virtualvairs-request@corvair.org writes:


> Message: 6
> Date: Wed, 17 Nov 2004 17:57:00 -0500 (EST)
> From: Frank F Parker <fparker@umich.edu>
> To: "Norman C. Witte" <ncwitte@wittelaw.com>
> cc: virtualvairs@corvair.org
> Subject: RE: <VV> Re: Turbo set up--was mileage
> 
> > are great ideas, but I am mainly looking to make a car that will be nice 
> to
> > drive all summer, and maybe to be a shade quicker to build boost.
> >
> > So you're right about the tangled web.
> >
> Biggest problem with the stock setup was Chevy had to use intake and exhaust 
> restrictions to limit boost since cheap enough wastegates were not available 
> back then. Everything especially exhaust leaks have to be perfect to run as 
> intended. Carb mods, different turbines like 150 can be used to help spool 
> but these are all small change compared to adding an external wastegate. Then 
> other simple changes that would have overboosted the engine, now will help the 
> spool alot and any excess is vented.
> 
> Water injection or a Safeguard are the 2nd major item. Thus adding a 
> wastegate and WI or Safeguard are the 2 big things to do.
> 
> Warren has done all this and you could have him fab it for you and tune it 
> in. Do NOT neglet the tuning!
> 
> regards,
> 
> frank
> 
> PS: Doing the full blown setup next spring on my new Corsa 180