I am running 6s in a losi 8T with a Neu 1515/2.5d and MMM, recently I was running a 18tooth pinion with a 48 tooth spur and it ran hot but I was running in grass, I went down to a 16 tooth and will try that today. I run LPR tires in mine and happy with the results

here is a link

http://www.losipartshouse.com/servle...Mounted/Detail


and for the street

http://www3.towerhobbies.com/cgi-bin...&I=LXNHW8&P=FR