2017 Moto Guzzi California Touring:
Rain mode definitely softens the acceleration, and limits top speed on the
highway noticeably.
From page 76 of the owner's manual:
"The system reduces the maximum torque supplied by the engine and smoothly delivers it so
as to prevent loss of traction. In this mode the motorcycle's performance is limited, and therefor,
the maximum speed cannot be reached."
Most of the time I run in Veloce, but I will change it to Turismo in the rain. I used the rain mode when
I first got the machine, but I don't think it's really needed. I don't notice a great difference between
Veloce and Turismo, but maybe I'm not trying hard enough.....
I leave the traction control in the least restrictive setting.
-Stretch