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The more open the throttle is, the higher the manifold pressure, so the manifold pressure values must
be higher. SDS delivers a longer injection pulse to get more fuel into the cylinder. By adjusting the
manifold pressure values from their default, you can change the mixture of the engine at different
pressures to achieve best power or economy.
Use Gauge 1 mode to see what manifold pressure range the engine is running in, then use the < >
keys on the programmer to move to the range you want by adjusting the values if desired.
Lean Warning
This feature allows some protection against a lean condition at higher throttle openings. You must
have a wideband meter that has an analog output connected to the SDS main harness gray wire and
a TPS installed for this feature to operate. This feature may not be reliable with leaded fuels since
they affect operation of O2 sensors. If enabled, the system will monitor the O2 sensor voltage, and
when throttle position is 35 or higher, and if the mixture is leaner than approximately 14 to 1 for 2
seconds, then an ERR message will be displayed in Gauge 3 and Gauge 4 modes in place of A/F or
O2 volts. Also this will turn on the check engine light output on the ecu. The ERR message and check
light remain until you manually clear them by pressing +10 while in Gauge1 mode. The ERR message
and check light also clear when SDS is powered down.
There are 3 settings for this parameter:
1. Disabled. Correct setting when no O2 sensor is connected to the SDS ecu.
2. Enabled. Turns on Check light, and displays ERR in Gauge modes. Does not add fuel.
3. Enabled + add fuel. This does the same as the Enabled setting, plus when the ERR occurs, 25%
will be added to the fuel mixture above throttle position 35. This may help prevent engine damage
by allowing the tuner time to acknowledge the problem and close the throttle. To clear the ERR
message press +10 while in Gauge1 mode, then this will remove the extra 25% fuel. Then further
tuning or troubleshooting should be done.
We recommend that lean warning be disabled on engines which will routinely be running lean
of peak (LOP).
Lean Warning should be set to Disabled when there is no TPS installed.
Lean Warning may not function long term when Leaded fuel is used since the lead may foul
the O2 sensor. Lean warning will not function unless a TPS is used.
The Lean Warning will not function if O2 Type setting is “NONE”.
LCD Brightness and Contrast
On systems made after Aug. 20/17, there are 8 settings for the LCD backlighting brightness, from 0 to
7. Use the +1/-1 buttons to increase or decrease brightness for ambient cockpit lighting conditions.
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