Re: turbo theories Part ???

[RayVR4@aol.com]

Here's another idea:

I would think that even with a bypass valve that some of the turbine speed
loss is due to the turbo creating a low pressure area between it and the
engine when you lift off throttle (hence the possible use of extra injectors
in the headers of rally cars).  In this case the turbine wheel is fighting
atmospheric pressure on the exhaust side.  Maybe if you can get the wastegate
to open under both vacuum and boost you can better maintain turbine speed
(sort of like a compressor bypass for the exhaust end).  Might be as simple
as drilling and welding a fitting to the opposite end of the wastegate,
attaching a manifold vacuum source and t-ing in a one way valve so that it
only sends vacuum.  Of course this does mean that the wastegate will be open
while idling which will introduce some lag off the line.  Am I crazy or what?

Ray