Ugh.... how did you pull me back into this stuff?
Power Drift has a few outputs.... vibration motor was just a motor put under the seat I believe and it indeed just gives off engine vibration. That on works in every cabinet style. upright_wheel_motor only works in upright/sitdown cabinets. It's a simple rumble when you go off the road but what's interesting is it doesn't strobe on and off like most games do... rather it's a constant on. This is because it fires a motor with an offset weight, similar to a modern gamepad. The real deal is bank_motor_position, which will only appear with the cabinet set to moving (remember to restart the game). I didn't fully figure it out, but I got enough. I figured out a 7 position resolution.... 4= centered with lower numbers banking left, down to 1 and higher numbers banking right, up to 7. I might have that backwards actually. Anyway, at the time I had trouble crafting an effect that smoothed it out enough so take a look at it and see what you can do.