Comment 14 for bug 246952

sergio
Current kernel driver for your wheel does not support autocentering manipulation. So you cannot see any effect from constant force (but if you run ffcstress, it is possible wheel changes centering force for one of sides). If you know how to recompile hid-logitech kernel module, then you can modify sources by hand (drivers/hid/hid-lgff.c): replacing line "{ 0x046d, 0xc294, ff_joystick }," by "{ 0x046d, 0xc294, ff_wheel },", then you need to recompile module hid-logitech.ko, unload old module and load new.
Kernel developers already apply my patch for this wheel, so next stable kernel (2.6.30, I think) will be has autocenetring for your wheel. Current kernel driver only supports autocenetring for Logitech MOMO Racing wheel.