The Spit V, in all intances and if flown correctly, will eat the N1K for breakfast, lunch, and dinner.
If it is out turning you, I have to ask ...
Do you have the "Stall Limiter" turned on ?
Are you using flaps at the correct time ? Even without flaps, the Spit V should turn inside the N1K easily.
The N1K will out run the Spit V ...
As a matter of fact, most planes will out run the Spit V. Do not run from the N1K ... make him play in your "world" ... turn fighting. If you have some separation from the N1K, turn back into him and force him to start turning with you.
The N1K will out climb the Spit V ...
Unless you have a pocketfull of E, do not try to follow the N1K up. Turn in the opposite direction ... get some speed and E back and be prepared to turn back into him if he brings the fight back to you. Like above, try to get him into your "world".
Co-alt and Co-E, the Spit V is probably the most dangerous fighter in all of AH.
When I encounter a late war machine, that is carrying alt and E over me, I try to maintain my Spit V in its most dangerous envelope ... somewhere around 275mph.
If they make a BnZ approach, I will cause them to miss, but I will not follow them. I will continue on my heading (after the miss) and get my speed back up. If they extend slightly and turn back to attack (still with more alt and E than me), I will do the same thing again ... cause them to miss and build my speed back up while they re-think and extend. If I can continue to avoid the attacks and maintain this envelope, they will eventually bring themselves into the Spit V "world". At that point, they are in deep yogurt.
If you want to see the Spit V at its finest, go here ...
http://www.theblueknights.com/Films.htmlI have watched many, if not all, of Leviathn's movies and they are invaluable for learning how to fly and get the most out of the Spit V.