Paul,

I read and hear about turbo cooling down and when not done properly it may
damage the turbo.  Do you know something about that.

I have some numbers on running my turbo 13b (static only).  Would you like
to have that.
I have a hard time finding someone to modify my turbo so I reduced my
exhaust stack from 3" to 2" and trying to see if it makes a difference.

Not

flying yet, only static runs.

Thanks
Rino

Yes I would like to have the numbers.

A lot of turbo cars have an automatic device let the engine idle
for a short period after the engine is shut off by the driver to
cool the turbo down more slowly.

Car turbo's are designed
with excess HP over and above that required for
constant boost to insure rapid spool up of the
compressor. Consequently they over speed, especially
at altitude, throwing off the turbine blades.

If you have the stock 1990-92 turbo there are a lot
of guys in the states that can add a larger compressor.
The 2 inch down pipe will help but not enough IMHO.
Enlarging the waste gate hole and allowing the waste
gate flapper to open at a greater angle will also
help. Still not enough IMHO.

Dave Leonard had a larger compressor installed and it
seemed to be working up until his off airport landing.
Nothing to do with the turbo. He froze the engine up in a
high mountain airport with inadequate  antifreeze solution
in the cooling system.

Who did you use Dave to modify the turbo and are you happy
with the cost and workmanship?

BTW Rino I like your dual alternator set up.

Paul Lamar ...No rotor no motor.

The turbo is not modified yet, it is hard to find someone to do it.  I want
the compressor wheel clipped.  They all want to install a bigger compressor.

The alternator bracket is not bolted to Tracy's redrive it is clamped on it.
I installed the alternators there because they were restricting the air flow
too much up front.

Thanks for the info. on turbo cooling.   I think we idle the engine long
enough to take care of the cooling when we taxi back to the ramp or hangar.

Included are the numbers taken on Tracy's EM2 and a couple more gauges, I
ran 4 tests and combined the readings so it gives some eratic figures.  I
had to work fast before the engine overheat and took some readings before
the temp. stablized.  There seem to be a problem with the manifold pressure.
The fuel mixture is too rich on these runs.  Did not dare run the engine
faster yet it gets hot too quickly.  I will try again tomorrow.

Rino

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