What gearing savage x ss conversion

[naynay12]

Since i havent been getting many replies on how well the 4s exrun esc will run,decided to go for 4s rhino pack,with 150a ezrun esc,and either an 8 or 9xl fiego(which motor will be better allround)?Should i run an external bec?
Anyway i have a 47t spur gear and am wondering what tooth pinion i should go with,to get as much top speed as possible without the set up over heating?Also any comments on my set up welcome.