My tests.
Empty Motor bay
- doesn't move at all. It steers tho
1.0 BCG Motor
- Ran nicely, but a little noticeable noise. Suprisingly doesn't seem very 1.0-ish in boost mode with the Power and Speed gears on.
2.2 MS Motor (stock)
- Quiet but in unboosted, does look 1.0-ish to me.
3.2 BCG-Motors Motor
- Noisy, but has significant increase in power in both modes.
Those are the only motors I have.