[Diy_efi] RE: Throttling intake air -- references

[Erik Jacobs]

> What about a "new" wastgate that is a variable A/R turbine housing?  Boost
is
> controlled by increasing A/R to the point where is maintains desired
boost.
> OK, making a housing like this may be difficult :)  I guess this is kind
of
> like VATN, but better :)

I'm coming into it late, but couldn't some kind of servomotor be implemented
in place of the wastegate such that a waste *route* for the turbine could
have it's orifice varied?  For example, a door controlled by a valve, in
essence, at the end of the manifold but before the entrance to the turbine
section (maybe in between the manifold flange and the turbine flange).  This
door could, referenced to throttle position and observed intake manifold
pressure, be opened and closed so as to direct exhaust pulses towards or
away from the turbine section.  This could be done fairly instantaneously.
It does not deal with the problem of the turbine's momentum, however.  But
would a bypass mechanism in the intake (blowoff valve, etc) be a performance
decreasing measure overall?

This would result in a turbo that had the same characteristics, but which
could be fed selectively.  You could also probably reference it to RPM for
something?

I dunno, now it's sounding like a silly idea.


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