I've been reading this thread off and on and I'd like to give my input on
it.

Being from the automotive arena, I've got alot of practical, in-car
experience with the
use of the two stock turbochargers (both the earlier 87-88 unit and the
89-91 unit) and
I must say that they absolutely stink!  The turbine housing is too small in
my opinion for
the breathability of the engine, even a stock engine with no modifications
done to it.  It
runs far too hot.  I also believe it can cause alot of backpressure past the
point of about
8psi of positive manifold pressure.  Some may disagree, but I believe this
turbo isn't
as well suited to the 13B as are some alternatives.

One of these alternatives is the Borg Warner (Schwitzer) TO4B "replacement"
turbo
that is sold as a generic T4 turbocharger to the public.  The part # is
313102.  Although
I believe it comes with a turbine housing that has too large of an A/R
ratio, I believe it
would be very well suited for you guys.  It is larger than the stock unit
but not substantially.
Since it is a larger shaft unit w/ larger exhaust housing and compressor
setup, I believe it
will produce the same power you guys desire for take-off and climbing let's
say, at a
lower positive boost pressure, with far less heat.  If there's one thing I
have learned about
rotaries in all of my years of working on these and blowing them up, it's
that the exhaust
system needs to be atleast 100% efficient as the intake system is.  This
includes the sizing
of the turbocharger's turbine housing specifically in this case.
Comparatively to piston
engine setups, our engines demand the use of a large turbine housing to keep
exhaust
backpressure low as well as velocities high.

This turbo is cheap (about $450 brand new) although it would probably
require a
slightly smaller A/R ratio turbine housing with the proper exhaust flange
welded on it.
This turbo also has a dry bearing housing (meaning it does not use coolant
lines).  Tapped
for 1/4"NPT on the oil feed side.  This is a moderately sized turbocharger
but not too
big for the application in my opinion.  Definitely worth a try!

Once I get some pictures of this 313102 TO4B unit taken here, I will post
the link.

B
__________________
Brian D. Cain -/- Grand Prairie, TX -/- bdc196@killspam.comcast.net
bdc@killspam.teamfc3s.org
BDC Motorsports - Performance 13B Engines, Haltech EFI tuning, Etc.
MSN bdc196@killspam.hotmail.com, Yahoo! bdc196, AOL Symajhi, ICQ# 1733105
http://bdc.cyberosity.com -/- http://groups.yahoo.com/group/HaltechSupport--