<VV> Turbo Setup

[Sethracer@aol.com]

In a message dated 11/17/2004 3:48:24 PM Pacific Standard Time,  
RoboMan91324@aol.com writes:

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.





You have confused a waste gate and a pop-off valve. A proper waste gate  
vents exhaust gases from ahead of the exhaust turbine of the turbo. It is boost  
controlled (usually) and is operated by opening a valve in the tract between 
the  exhaust manifolds and the turbocharger exhaust housing. Less exhaust 
entering  the turbo - less compression on the intake side. Some turbos have integral 
 wastgates. The pop-off valve vents pressured air from the output side of the 
 Turbo compressor either into the air or back into the inlet side of the 
Turbo  compressor. You certainly don't want a pop-off valve venting a fuel-air 
mixture  to the atmosphere - Although the results might be spectacular to observe 
- from  a distance!! Only Fuel Injected cars (excepting, maybe, old 
dragsters, where  pop-offs would allow a backfire to vent and not launch the blower 150 
feet into  the air - Which many did anyway!) - anyway only Fuel Injected 
cars, or blow  through systems, where the Turbo pumps air only, can use pop-off 
valves. -  Seth