I'm tuning the engine, it's a 13 BREW (92 twin turbo) that I'm
running as normally aspirated. I think I might need to reduce
the injector rate on Tracy's EC2, since his factory setting is
for the normally aspirated injectors. On the normally aspirated
engine, both primary and secondary injectors have the same flow
rating. I found that my injectors are 28 lbs for the primary,
and 40 lbs for the secondary. Does anyone know what a normally
aspirated 13 B,  say a 1988 engine has for factory injectors?

I'm finding that I'm running rich, I can't seem to lean out the
setting enough in mode 1,  and might need to change the
injection rate in Mode 3 on Tracy's controller.



Brian Trubee
RV-4 1992 13 BREW.

How and where are you monitoring the intake manifold pressure Brian?

Try turning down the fuel pressure regulator. What pressure do
you have it set for now?


Paul Lamar

I'm using the stock fuel pressure regulator, it reads between
37-39 psi.(It's not adjustable) I measure the manifold pressure
from the port located at the back of the intake plenum, you can
see the barb adjacent to the alternator relay.
Tracy's computer has a provision to reduce the injection
rate,(Mode 3), and to reduce the injection rate for just the
secondary injectors (Mode 6). Even leaning as much as the
computer will go with Tracy's factory setting, I still read
about 3/4 up(rich) on the mixture scale. When I then shut down
the secondary injectors, or turn the fuel pump off, the engine
smooths out considerably until the pressure drops off and the
engine stops. I'm getting 4,500 RPM with the throttle open as
much as I dare open it, and it really wants to drag the locked
brakes across the ramp. The prop is a 74 inch diameter x 88 inch
pitch if I remember correctly. Don't know that this tells anyone
anything of value, but there it is.

I think I can get a much better picture of what's going on if I
can get the injector size of Tracy's engine. I sent my previous
e-mail out to him, and am waiting to hear back from him. I'll
share any info with the group, of course.



Brian Trubee

Ops that won't work.

OK try moving the pressure tap someplace along the side of
the plenum. You may be measuring dynamic pressure and not
just static pressure. Also put a restricter in the line with a
.060 inch orifice.  We are out of pressure taps for the rotor
housing which is the best place to measure the intake manifold
pressure.

Here is what I have on injectors.


Paul Lamar