[Diy_efi] RE: Banjo Dis. Pic --- Throttling intake air

[Greg Hermann]

At 5:37 PM 1/14/03, Marcell Gal wrote:
>Hi,
>
>> What I should have said here is,...' you are controlling the
>> source of combustion which takes less energy than the hotter
>> consumed end product which is wasted when wastegate opens.

OK, here's a flight of fancy--Think turbo compound. YEP, Holset is MAKING
some exhaust side only turbine units meant to go in the exhaust downstream
of the turbocharger turbine, and meant to be geared via a fluid coupling to
the crank. Similar to the old Wright Cyclone concept, and the Napier
version of the idea.

Like so: Use a turbocharger with no wastegate, and a variable nozzle
compound turbine , geared to the crank downstream of it. Control the boost
by using the vanes on the compound turbine to regulate the pressure ratio
across the upstream turbocharger turbine !!

Greg
>
>But how can we make a turbine in such a dynamic environment
>that does not ever need an open wastegate?
>(in a static environment it looks easy)
>
>It seems to me that if we want a quick response (low latency,
>fast spinup) turbo, we need to releive it from part of the exhaust
>when reaching full-power (max exhaust).
>This could be done by attaching the wastegate to a second turbine
>which feeds the battery or a hiperC or adds to the torque of the motor
>(and partly take the function of the flywheel)
>(so that the extra exhaust is not wasted any more). Or brake the
>turbine above a specific RPM with a generator (however the
>generator would increase the theta therefore adding to lag)
>However it seems to me that not a lot of manufacturers do this.
>We ain't operate at full throttle too much
>and the efficiency is not very good there anyway.
>
>I might be wrong
>
>Marcell



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