Castle Creations motor and ESC combo recommendations for the Arrma Vendetta 3s.

Copperhead 10 w/1412-3200kv -Stock Gearing (20T/50T) on 3s = ~50MPH
Cobra 10 / Mamba X w/1415-2400kv - 24T pinion/50T spur on 4s = ~60MPH
Cobra 8 w/1512-2650kv - 26T pinion/50T spur on 4s = ~70MPH

Note: All speed estimates are with stock tire diameter, high quality batteries and appropriately sized battery connectors.
Always monitor ESC, motor and battery temperatures on new setups or when changing gearing or batteries.