Works with Tracy's EFI and P-port slide throttle.
Makes the p-port engine easier to tune on the top
end. These are made of brass. They are 1/8 inch diameter
to be 3/16th OD silicone hose compatible with Tracy's
pressure sensors. They have a .050" diameter hole
in the end.

The installation is as follows.
Put both 2 inch ID rubber hoses on the inner cover of
of the slide throttle. Now here is the tricky
part. Get one of these right angle attachments unless
you already have one.

http://www.amazon.com/Tight-Fit-Tools-Aircraft-Attachment/dp/B0002RVID4

Drill a 1/8th inch hole through both the rubber tubing and
the 2 inch OD aluminum tube welded to the inner cover of the
slide throttle. Insert one of these pito tubes in each
runner. drill a 1/8th inch hole in the SS hose
clamp used to clamp the hose to the inner cover
of the slide throttle. Tee the two pressure hoses
together and feed them into Tracy's pressure sensors.
Your done.

The theory here is these will act as a static pressure tap
when the throttle is less than 75% open and a pito
tube when the slide throttle is wide open. The air velocity flowing
into an engine can be as high as 300 MPH. This increases
the total pressure seen by Tracy's pressure sensors so his
EFI will inject a little more fuel. The increase in total pressure
could be as high as one psi while WOT manifold absolute
static pressure is normally about 15 psi at sea level.

I'll  have a bunch of these made up.

Paul Lamar