Bypass valve effectiveness?

["Graydon D. Stuckey" <graydon@apollo.gmi.edu>]

OK Guys,

	I have been accused of not posting messages - I only respond to 
others' posts, so here goes an original post from me...  :-)

Question-

	If I shift gears without lifting my foot off the accelerator, 
will that allow the turbo to keep spinning while I shift gears?   Since 
the throttle is still WOT, the turbo will keep spinning full speed and 
try to accelerate the engine through the stratosphere right?   I should 
have instant boost when I release the clutch again and with the small 
rise in rpms during the fraction of a second that I was shifting, I 
should have a small surplus of potential energy stored in the flywheel to 
help accelerate the car when I finally engage the clutch, right?   This 
should represent the ultimate in terms of the effect of a compressor bypass 
valve right?

	Well, the car is only marginally faster when I shift this way
compared to the performance if I shift normally.  Part of the additional
acceleration is no doubt due to the very short time it takes to shift when
I really concentrate hard to do it fast and correctly.  I also have a very
slick-shifting transaxle IMHO compared to a number of Audis I've driven. 
Therefore I see little reason for adding a bypass valve.  If I _really_
_have_ to go fast, I can "speed shift" although I only have done this a
couple times to test the theory.  By normal shifting, I mean that I
release the accelerator (sometimes only partially to maintain a little
flow through the intercooler and turbo but reducing the risk of over
revving the engine substantially) while shifting. 

	Thoughts?  Rebuttals?  Is there another reason for the bypass
valve? 

Later,
Graydon D. Stuckey 
****Standard disclaimer.****
Nothing I have said should be construed to mean anything you think I 
might have said in any way whatsoever.