pellik, bozon, your both saying the same thing, and are both basically correct.
The REASON the p47 (or fw, or heck any plane that doesn't hold E like the spits do) will out turn spits is that it is bleeding E much faster, and slower plane, tighter turn radius. You should out turn the spit for a round or two, but then the spit will have the tighter turn, (it DOES turn better at slower speeds), and it's time to dive away and regroup.
Now a SMART spit pilot will chop throttle, and you are doomed.
If you are in a Jug, trying to flat turn with a spit, your need to rethink your flying.