You are right, my engine has the fixed wastegate ( Bolt in the waste tube ).
The flow was read from both the piper differential gage and a fuel flow
sensor/computer. They both had the same reading.
Thanks for the service directions link. I will go over it in detail.

wrote in message
...
On Sun, 04 Jun 2006 23:48:02 GMT, "soxinbox" wrote:

The first step would be to make sure that your fuel system has been
setup IAW

http://www.tcmlink.com/pdf2/SID97-3C.pdf

It should really be done on a regular basis whether or not you think
you have fuel delivery problems.

Was the 14 GPH a mechanical fuel flow (which is actually a pressure
gage BTW) indication, or from a flow/totalizer indicator?

Your engine really doesn't have a wastegate/controller, it essentially
has a fixed bolt screwed into the exhaust stream. The bolt is adjusted
in or out to match requirements called out in the aircraft maintenance
manual.

Turbo plus used to offer a variable replacement unit that essentially
used a diaphragm to move the bolt in/out according to demand. Only
ever worked on a couple of aircraft that had them installed, and never
had the opportunity to take one up to altitude.

Maybe some Mooney people can jump in here, I'm thinking that the
Mooney's with similar engine installations had a CDT (compressor
discharge temp) gage, with a redline/max temperature. Again, never had
the chance to get one so equipped up to altitude to see what effect
altitude had on the numbers.

TC

I have a piper turbo arrow with a TSIO-360-FB engine. It has the original
waste gate on the turbo, and an after market turbo plus intercooler.
I recently made a long trip, and got the plane up to 14000 for the first
time in a long time. I was having trouble keeping the exhaust temp down. I
had the mixture full rich, and the engine was only using 14 gph. It seemed
I
could not get the mixture rich enough.

I don't remember this happening on any of my previous flights at high
altitude, but the previous flights were a while back. The plane behaves
perfectly normal at altitudes up to 10000 which is were most of my flying
is.

Does this imply something wrong with the fuel system or fuel pump or is
this
normal behavior for these planes?