It well might be.  Taking that flow chart and trying to back engineer the
engine operating parameters here is what I get

          ratio
         Boost     psi
             lbm
         CFM
         RPM

      1.5
     7.35
     10
     87.7193
     1894.736842

      1.7
     10.29
     20
     175.4386
     3789.473684

      1.8
     11.76
     26
     228.0702
     4926.315789


as possible operating parameters for the RX-7 engine (single turbo pre 1993
Rx-7).  We know throught SAE papers that  the Mazda engineers tailored the
post 1987 turbos to boost performance at the lower rpms.  So this might well
be a close match to the compressor map for the Ht 18. Do these boost rpm
parameters look close to any of your turbo Rx-7 drivers with models between
1987 and 1993????  Looks like you would get lots of boost at fairly  low
rpms with this turbo on a rotary.


Ed Anderson


> A discussion of john's turbo failure, along with pictures, is occurring at
>
> http://canardaviationforum.dmt.net/showthread.php?t=5
>
> I thought to mention to this group that I have been told the Hitachi ht-18
> (john's)turbo is very close to a garret t3 50 trim.
>
> Can any one verify or rebut this?
>
> I include a copy of the compressor map for your edification.
>
>


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