Don't turn at all more or less. Stay away from turnfights, not even a few "laps" if you can call it that.
You will be called bore n zooming sissy pants by many people, usually those who are anoyed with you not fighting on their terms. Ignore it, fly what you like and like what you fly, and fly it your way.
If the fight is fair you've done something wrong.
The Fw 190 is the worst turner in the game when it comes to sustained turn rate, while it can turn very hard at high speeds, that maneuver is limited by G forces for the pilot, and after the initial turn it will have lost most of its E.
Learn to aim and shoot at high speeds, deflection shots (not just picking the one who fly straight).