J.P. Instruments EDM 700/800/711 Pilots Guide - Manual (Page 20)

Page 16 Engine Data Management
To use the “lean of peak” method, tap LF and then immediately hold
both STEP and LF until you see
LEAN L. Once you begin leaning
(flashing dot) you cannot change leaning methods. You may toggle back
to
LEAN R by holding both buttons again.
Leaning Lean of Peak
-5 7.3
73
HP
1 2 3 4 5 6 T
_
STEP LF
EDM 800
JPI
_
EGT
%
Limit
_
300
400
500
CHT
TSO
Cylinder number
flashes when the
cylinder peaks
Temperature
below peak of
last cylinder to
peak
Shortest
column is
the last
cylinder to
peak
Current fuel
flow rate
First cylinder to
peak has
largest column
Hold LF to see
peak
temperature of
last cylinder to
peak (e.g.
I340)
Hold LF to see
GAMI spread
(delta fuel flow)
In the “lean of peak” method the columns will invert with the first to
peak progressing down from the top of the display. The inverted column
scale is 5° per segment below peak. As you continue to lean past peak
the dot of the each successive cylinder will flash as it peaks. The peaks
will be shown as an inverted bar graph; when the last cylinder peaks
its column will flash. The analog display is an inverted bar graph
showing where each cylinder peaked. When the LF button is held the
display will show the delta fuel flow between the first and last to peak
(GAMI Spread), as well as the richest peak EGT.
If you tap STEP, scanning will resume. Or instead, if you Tap LF you
will return to the inverted bar graph, which can be used for fine tuning.
To begin the LeanFind procedure anew, tap LF a second time.
Turbocharged Engines
The leaning process for turbocharged engines is by reference to the first
cylinder or TIT to reach peak. However, the TIT factory red line may
limit the leaning process. TIT red line is generally 1650°F, and up to
1750°F in some installations. In the LeanFind mode the T column—
TIT—is included in the procedure. If during leaning the TIT exceeds red
line by less than 100° for less than one minute, the LeanFind procedure
will continue to operate, allowing you to complete the leaning process.
Otherwise the digital display will show, for example,
I650 TIT and TIT will