[Diy_efi] How to read turbine RPM

[Hugh Keir]

Axel Rietschin  wrote < snip >

" For this to work optimally you'll need to use a turbo speed sensor  "

Would  like to know how to read turbine RPM especailly from non magnetic
compressor / turbine wheels.

Can you offer any info / links on how it is done.

Thanks

Hugh

----- Original Message -----
From: "Axel Rietschin" <axel_rietschin at compuserve.com>
To: <diy_efi at diy-efi.org>
Sent: Sunday, January 05, 2003 6:17 PM
Subject: Re: [Diy_efi] Water metanol turbo assist - was Argon turbo


> ----- Original Message -----
> From: "Ohio Benz" <ohiobenz at yahoo.com>
>
> > I would suppose that the ideal condition has the H2o
> > vaporizing as it enters the turbine so that the full
> > velocity of the vaporization increases the turbine
> > speed - which is what the goal is.
>
> Probably, but it will be very hard to reach, let alone maintain, your
ideal
> condition given the very rapidly changing conditions in the manifold
> (pressure and temp). Also the water is very likely to boil in the nozzle
or
> even before reaching it, vapor-locking the injection system.
>
> As far as reducing spool-up and increasing throttle response another
> approach would be to use a deliberately small sized turbine housing, and
> then aggressively open an oversized waste gate to reduce back pressure as
> soon as the turbo is up to speed. For this to work optimally you'll need
to
> use a turbo speed sensor and target a certain turbine speed instead of the
> usual MAP or MAF. If you use a desmodromic wastegate actuator (with your
> classic PWM control signal feeding the 'opening' side and its inverse
> applied to the 'closing' side) you can use very little preload on the
> actuator and you end up with a very quick and accurate control the
> wastegate. With a capable ECU, a properly tuned PID loop and appropriately
> sized turbo components, you get rid of most of the lag and backpressure
with
> a reliable system. On top of that, for off-road/competition use, you can
> then implement an electronic anti-lag system (with TPS-based air bypass,
> cylinder cut and ignition retard - and also a MAR-M-247 turbine & shaft if
> durability is on your whish list) and you end up with an absolutely
zero-lag
> turbo engine. Ultimate examples of those include World Rally Car engines
> which, by the way, run about 11:1 CR and use intake WI along with 102 RON
> fuel.
>
> Hth,
> Axel
>
>
>
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>


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