I race 4wd so not too hot on 2wd setup. What i do know is that the fastest brushless 2wd racers have 5.5 turn and lipo. That is the limit i would say so 6.5 turn is ok, but may be a bit much if you are new to the sport.
Most of the guys with b4's run staggered ribs on the front and minipins on the back. I think yellow schumachers, but don't hold me to that.
Not sure on oil or springs for 2wd, i run 35wt oil in the front and 30wt in the back on my 4wd D4.
The track is quite bumpy and very grippy when dry
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