Thanks, I have seen from races I have been to with my T-Maxx that the XXX-NTs are more reliable and faster than the GTs, but fastest is a HPI Rush with a 15SS (up to .15 is legal) The fastest Losis are using Fantom engines or Novarossi. The fantoms have loads of go are they better than the CV-R?

How often do you re-build your XXX-NT diff? (I have seen a lot melt)

I have found with my .18 that I get better performance with 10% nitro than with 16%. With 16% the engine runs hotter and I have to run it 3/4 of a turn richer than I would with 10%. I can nearly make the whole main on one tank and 16% so I should be able to go the distance with 10%. I have noticed no performance advantage with a higher nitro content