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When displaying Fuel Flow, the FP-5L will operate as follows:
A. When set to display in Gallons the display will read in .1 Gal/Hr increments up to 199.9 Gal/Hr. If the
fuel flow exceeds 199.9 Gal/Hr, the display with switch and read in 1 Gal/Hr increments to 1999 Gal/
Hr.
B. When set to display in Imperial Gallons the display will read in .1 Gal/Hr increments up to 199.9 Gal/
Hr. If the fuel flow exceeds 199.9 Gal/Hr, the display with switch and read in 1 Gal/Hr increments to
1660 Gal/Hr.
C. When set to display in Pounds the display will read in 1 Lb/Hr increments up to 1999 Lbs/Hr.
D. When set to display in Liters the display will read in 1 Ltr/Hr increments up to 1999 Ltrs/Hr.
Special algorithms in the microprocessor are used to ensure a
quick response and a stable display. Also, there are two programmable
filter settings that will affect the stability and response of the fuel flow
readings (see the “Power-up Programmable Settings” section of this
manual).
The accuracy of the displayed fuel flow is affected by the value of
the K Factor. The K Factor sets the calibration of the instrument to
match the flow transducer and the variations in the installation. The K
Factor may be changed by entering the "Power-up Programming
Mode" or it can be changed automatically by entering the "Auto Cali-
bration Mode."
When displaying % Horsepower, the FP-5L will operate as follows:
A. Horsepower is calculated from fuel specifics (as is done on engine dyno's) which takes into account
manifold pressure, RPM, altitude and OAT. Almost all spark ignition combustion engines have a fuel
specific of approximately .10 gallons per H.P. per hour at full rich mixture. The "Power-Up Pro-
gramming Mode" allows you to calibrate the FP-5L to match your engine at a full rich mixture.
B. The FP-5L was designed to display in % Horsepower (1% resolution). It is possible to calibrate the
FP-5L to display in raw horsepower. See the "Power-Up Programming Mode."
Warning: You should never lean your engine with power settings over the factory recommended
level (generally 65% to 75% power). Leaning with high power settings can cause detonation. Always verify
your power level with engine charts before leaning. As you lean past maximum horsepower (100°F to 150°F rich
of peak EGT) your engine will lose power.
Each flow transducer outputs a
different number of electical pulses
for each gallon of fuel that flows
through it. This value is called the
K Factor. The FT-60 has a K
Factor of approximately 68,000
pulses per gallon. The installation
and the type of engine (carbureted
or injected) can affect the K Factor.
What is a K Factor:
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