[MTBikerTim]

Originally Posted by Sammus

I think that guideline is more for poorer quality motors like feigaos... Neu's I think are their most efficient up around 50k. Someone correct me if I'm wrong...

I think part of the reason for staying around the 35k rpm mark is that is makes gearing a lot easier in most cars. My buggy comes with a 13t pinion with the nitro motor and that was plenty fast enough for our track. If I put a 50k max rpm setup in it the smallest pinion would be an 11t and I would still be geared for over 50mph and if the system got hot from being over geared the only thing you could do would be buy another motor.