I have read on these boards that the 3.0 has no torque and that it needs a push start to even go. This would be useless for me because I am making a course with slopes and hills, andit sounds like putting a 3.0 motor in my car would only make it stall on these parts of my course.
I just got a 3.0 official motor and had a 3.8 that never worked good so i took it apart and worked on the brushes, but it never fit together again well…
my impression of the 3.0 feels like a 2.2 on startup, but the topspeed is a bit faster.
the 3.8 seemed to have a lot higher startign speed even, but when any strain was put on it it would coume to a complete stop almost sometimes and also had issues with sticking at points on the rotor, needing to be moved sometimes if the car came to a stop in just the right position (happened pretty often). thus I wouldn’t recommend the 3.8, but the 3.0 is a nice motor so far. My 2.6 and 1.6 are still on order a the moment so I’m not sure how they compare.