[Diy_efi] How to read turbine RPM

[Tom Sharpe]

You should be able to determine RPM from the sound frequency.  Don't know 
any formula, but a sound card and microphone should do it. Anyone give us a 
baseline? is the number of compressor blades relevant?  TomS.
On Tue, 07 Jan 2003 13:50:03, Mike <erazmus at iinet.net.au> wrote :

> Yeah I like this variant, paint one side white reflective to IR
> and the other sides absorb IR (black) and a simple reflector
> type module at right angles - needs a hole in housing but thats
> a minor issue...
> 
> So anyone know of enamel paints with known IR reflectivity
> constants ?
> 
> rgds
> 
> mike
> 
> 
> 
> At 04:43 PM 6/1/2003 -0700, you wrote:
> >I can't find the website, but I did see where a guy was using an optical
> emitter/detector and reflecting off the flat of the nut on the compressor
> end of the shaft.  If I remember right, he tapped a
> >small hole into the inlet housing to mount the emitter/detector gadget.
> >
> >Scott.
> >
> >
> >> > > " 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
> >
> >
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