800 Dragon Altitude Compensator

[stonehands1]

Does anyone know how an 08 Dragon 800 compensates for altitude? A sensor perhaps? Sled idles fine at sea level (22-2300)and is crisp and responsive. Unload at 2500 and idle is around 18-1900 and surges. At 4000 ft. idles at 1400rpm and surging worse.
Overall performance through 8000rpm worsens as altitude goes up. Thanks in advance for your help.

 

[mountainhorse]

Built onto the back of the ECU is a clear little box with a chip inside it... That is the Barometric pressure sensor... It has a little vent nub on it to reference ambient atmospheric pressure.

 

[stonehands1]

Thanks Mountain horse.