Castle motor 2650 on 5S lipo

any idea what size pinion i should start with,right nowim running a 52 tooth spur on a torsen diff but if u think i should change to a46 i can,like i said probably going to run 4s not lookin for speed records just parkin lots runs ,50mph to 60, is that possible? on 4s or, should i run 5s for cooler temps,i used to have the 2200 in it but i put that in my truggy