I'm running an MGM 16025 Z Series in my Tekno/Losi 8T with a Neu 1515-1Y motor & Thunder Power V2 5000mah 4S lipo's. The MGM is expensive but waterproof which I thought essential for racing outdoors in our weather.
The 4S is pretty quick (pretty much the same as my nitro 8T but I haven't had chance to try different gearing options yet) but I'm going to try the TP 5S at some point just to see what difference it makes. Apparently if you go to 6S it's just totally ballistic and overkill for most tracks.
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Losi Eight T - Nova Rossi P21-7T- Hitec 5955's & Spektrum + TeknoRC Losi 8ET - Neu 1515-1Y - MGM 16025 & Hitec 5995's.
RC Heli's - Align T Rex 600 Nitro Sport - X-Cell Spectra G gasser.