I think a turbo tach is the key to success whether you just
   want to use the stock 2nd gen turbo as is, want to modify
   it or replace it with a TO4. If you want replace it with a TO4
   get ready for big expenses and lots of time.
   My guess is well over $1500. I know many people that have
   complete engines for the same amount of money. Others
   consider it peanuts :)

   OK here is a cheap device by comparison.

   I at first thought I could find something off the shelf
   from Keyence but I called them and the fastest thing they had
   was 33 usec. http://www.keyence.com/usa.php

   Not fast enough. I figure 100,000 RPM 1666 RPS
   or one rev every 6 to the minus 4 seconds or 00.0006 which looks
   like 6 usec if my memory and arithmetic are correct.

   Perkin Elmer has a .5 nano second photo diode that will do the job.

   http://optoelectronics.perkinelmer.com/catalog/Category.aspx?CategoryName=Photodiodes

   Download the Emitters and Detectors Brochure pdf.

   All we need now are; fiber optics, an emitter, an amp and a counter.

   If somebody knows of an off the shelf solution I would love
   to hear about it.

   We can also use this turbo tach when it comes time to test
   the turbo compound engine on the Mazdatrix dyno.

   Paul Lamar ...No rotor no motor.

   Paul,

   What about the turbine tach on the small APU turbines? These engines
   don't go much over 60,000 rpm, but the tachs might have a higher range.

   Regards,

   Gordon.


I don't know anything about them. I have just met a fellow
that does however. I'll ask him next time I talk to him.


Paul Lamar ...No rotor no motor.

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