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SDS systems that do Fuel only (no ignition control) can still do LOP but cannot change the ignition timing
for you.
Lycoming LOP test case:
If we run best power mixture at 12 to 1 AFR for climb and wish to run LOP in cruise, we’d set MAP and
rpm with the throttle and prop control. From previous flights, we’ve determined from the engine monitor
EGT/ AFR meter and mixture knob that we like to run at about 16.5 AFR LOP. This required going 37%
lean with the mixture knob. We can now program –37% into the LOP LEAN FUEL % window. Now we
can quickly go LOP just by throwing the toggle switch without touching the mixture knob. The LOP
feature should only be used once you’re familiar with your engine and typically cruise at or near the same
MAP/ RPM power settings.
Optional LOP Fuel Trim, New for the EM-6
There is a 2
nd
set of fuel trim values for Lean of Peak (LOP). These trim values apply only when LOP is
activated. And when LOP is activated the regular Cyl fuel trims are ignored. Maximum trim is +/- 20%.
Lop Cyl trims are intended to help balance Cylinder temps when in LOP mode of operation. If Cyl temps
are close enough together then these values can stay at zero.
Pin13 Input window (No Photo) , Leave set to A/C. If another window named LOP control is set to
Pin13 then this will display “LOP control” on the 2
nd
line of the LCD as an over-ride message. To Left of
this window is the A/C Fast Idle window leave set to No. These windows are used for automotive
systems and are now obsolete for aircraft. These performed some ignition functions in older versions of
software.
O2 Type
Sections, are WMS, PLX-AEM(Old), AEM(new), Ballenger Extreme.
If you have the older Spartan wideband select PLX AEM(old). If you have the Ballenger AFR500V2 then
be sure to set its jumper inside for the Extreme output voltage range, please see the Ballenger manual.
Below, Parameters without LCD Photo, most are not used on aircraft.
Idle Fuel Amount and Idle TP Location leave set to Not In Use
Radiator Fan On and Fan OFF leave alone these are not used.
Fast Idle Switch leave alone not used.
RPM Switch On At Only used on Honda Vtec engines if switching a Vtec solenoid via a relay. Usually
set for 4000 rpms.
FuelCut /ManPress Can be useful on turbocharged aircraft to cutoff fuel if an overboost situation occurs.
Ignition related programming section
Crank Retard
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