How do I assign separate throttle levers in FSX with FSUIPC?

To assign separate throttle levers in FSX, remove FSX’s duplicate throttle-axis assignments, then use FSUIPC’s Axis Assignment tab to map each physical lever to Throttle1, Throttle2 and, if needed, Throttle3 or Throttle4. Choose direct FSUIPC calibration, calibrate every lever separately, and save the mapping as an aircraft profile.

This procedure applies to boxed FSX and FSX: Steam Edition. The user axis-assignment and calibration facilities must be enabled in your installation; an old unregistered FSUIPC4 installation may expose only its basic interface functions. Install the appropriate version from our FSX-compatible FSUIPC package and follow its included registration instructions if the control tabs are unavailable.

How do I map each FSUIPC throttle axis?

The cleanest setup gives FSUIPC sole control of the throttle axes while leaving FSX free to manage buttons and other controls.

1. Remove FSX throttle assignments. Open FSX’s Controls settings, select the Control Axes section and check every connected controller. Delete the combined Throttle Axis assignment and any engine-specific throttle assignments that FSUIPC will handle. Leaving one duplicate assignment is a common cause of jumping or linked levers.
2. Open FSUIPC. Load a flight, open the FSX Add-ons menu and select FSUIPC. If the menu entry is missing, FSUIPC has not loaded correctly.
3. Choose general or profile-specific controls. On the Axis Assignment tab, enable Profile Specific before making assignments if this mapping should apply only to the present aircraft or aircraft group. Use a general assignment when the same quadrant layout suits everything you fly.
4. Identify the first lever. Select Rescan, then move only the left-hand lever through most of its travel. Confirm that the displayed joystick and axis numbers respond to that lever alone.
5. Assign Engine 1. Select Send direct to FSUIPC Calibration, then choose Throttle1 in an available assignment field. Do not add the combined Throttle control.
6. Assign the remaining engines. Rescan, move the next physical lever and assign Throttle2. Repeat with Throttle3 and Throttle4 for a four-lever quadrant. Engine numbers run from left to right when looking forward from the cockpit.
7. Calibrate each channel. Open Joystick Calibration and find the page labelled for separate engine throttles. Activate calibration for each assigned throttle. For a normal lever whose aft stop is idle, select the no-reverse-zone option, then record its aft and forward endpoints with the displayed Set controls. Calibrate every channel rather than assuming identical hardware values.
8. Check the result. Select OK, load a default twin-engine aircraft and move one lever at a time. Only the corresponding engine throttle and cockpit lever should respond.

Profile-specific assignments, buttons and configuration-file behaviour are covered separately in our broader FSUIPC control setup guidance.

Which FSUIPC throttle mode should I use?

Use direct FSUIPC calibration for default FSX aircraft and conventional add-ons, but switch to normal FS axis controls when an aircraft’s documentation requires them.

Do not assign the same lever through both modes. If the levers work independently in a default FSX twin but fail in one add-on aircraft, the hardware setup is sound; that aircraft probably uses custom throttle logic or expects normal FS axis events.

Why do both FSX throttle levers still move together?

The usual cause is a combined throttle assignment still active in FSX, FSUIPC or another connected controller.

• Check every device in FSX’s controller list, including a yoke, gamepad and unused joystick. FSX can place a default throttle assignment on more than one device.
• In FSUIPC, verify that the first physical axis has only Throttle1 and the second has only Throttle2. Remove any generic Throttle assignment.
• Disconnect the aircraft’s autothrottle before testing. An active autothrottle may command both engines regardless of physical lever position.
• Test with a default twin-engine aircraft. If only one add-on links the levers, consult that aircraft’s supplied control requirements rather than repeatedly recalibrating the quadrant.
• If the displayed input values jump without moving the hardware, investigate duplicate axes, noise and controller detection using our FSX throttle troubleshooting steps.

How do I fix a reversed throttle axis?

Reverse an axis only once, preferably with the Rev option on its FSUIPC calibration channel.

If forward movement produces a lower displayed value, enable that option and recalibrate both endpoints. Do not also reverse the same axis in FSX or the hardware’s configuration software, because two reversals cancel each other and make fault-finding confusing.

A quadrant with a physical reverse range needs an idle boundary as well as minimum and maximum values. Set up normal forward thrust first, then follow our FSX reverse-thrust configuration guidance for detents, buttons and axis-based reversers.

Can two throttle levers control four FSX engines?

Yes. Assign the left physical axis to both Throttle1 and Throttle2, then assign the right axis to Throttle3 and Throttle4 using multiple assignment fields.

Calibrate the paired engine channels consistently so each pair reaches idle and maximum thrust together. If the quadrant has four physical levers, a one-to-one assignment remains preferable because it preserves independent control during engine failures and asymmetric operations.