[Diy_efi] turbo "throttling"

[Erik Jacobs]

> My thoughts were to use a divided turbine housing and build a
> throttle body that could be used to route the exhaust gases
> to A) one side of the housing or B) both.  This should give you
> two AR's and thus allow a big turbo to be spooled up quickly.
> Does anyone see a flaw in this idea?

The AR wouldn't change, I don't think, depending on the entry to the turbo.
However this is based on my assumption that the housing is only divided at
the entry port.  If the housing is divided throughout its entirety (like the
whole 'conch' shell of the turbine housing has a division in it around the
impeller) then, yeah, you kinda have two AR's, but I don't think that's how
they work...?

> >I was wondering... is there some way that you could divert exhaust
> >and intake flow around a really huge turbo?  I'm kinda thinking
> >of a system where the big turbo gets a little bit of exhaust gas
> >to start it moving at lower RPMs (where miserable lag would be a
> >problem), and then as RPMs increase more exhaust gas is
> >diverted towards the turbo because the energy is higher so it will
> >have less trouble spooling it)... but also keep the intake tract
> >free from having to "suck" through the turbo by offering a
> >diverted intake path as well... does this make any sense?  Where
> >am I going wrong with my thought train here?


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