[Diy_efi] How to read turbine RPM

Andris Skulte skulte at skulte.com
Mon Jan 6 22:15:55 GMT 2003


Perhaps a non-contact tachometer would work, if one of the turbine blades
were magic markered black? I'm sure Omega has stuff like this.

Andris Skulte
Z28tt-89 IROC T56 DFI Twin Turbo
www.skulte.com

On Sun, 5 Jan 2003, Hugh Keir wrote:

> 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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------------------
Andris Skulte
Skulte Performance Designs
http://www.skulte.com  
Z28tt-89 IROC T56 DFI Twin Turbo


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