I noticed more punch with the 3gear compared to the 4 gear on my b5m. I have doubts when people speak about the way the motor rotates and it having an inertia effect. I just think the rotating mass is so minimal & the gyroscope effect both together just is minimal.
Personally I use the 3 gear as default. However, if the track is really slippery I'll put the 4 gear in. It softens the punch and adds weight to the rear at the same time. Yeah I could just add weight I suppose, but because I have both I have to use them, don't I.
If getting a new car I would just get a 3-gear, that's it.
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