in a 190A8 with 4 20mms and heavy machine guns at 15k when I spotted a P-51D down low on the deck, moving fast and heading for my base. So I went diving down...
The pilot saw me as I closed and he pickled his ordinance. Normally, when bounced, Mustang pilots like to go into a tight turn, but this Mustang pilot had a bit of pluck and really started twist around the sky. I had the berserker rage going and did something I normally wouldn't do in a 190A8 - I turned with him.
Gradually we both started getting close to 250ias and I could feel the 190 start to torque over on its wing, so I leveled out, found a valley, and dove into it to keep my speed up. He followed me down and the fight was on!
I knew from the early turning that my 190 would lose its speed sooner than the Mustang would, so I started going into a scissors fight in the bowl of the valley. Eventually the Mustang overshot on a reverse turn and I managed to get a snapshot of 20mm into him. Off came his vertical stabilizer and he fluttered to the ground. "You shot down (somebody who's name I've forgotten) of (some RCAF squadron)." Victory through superior energy management.
Right about then his buddy came diving down on me. I hit WEP to get some speed so I could get the 190 back into the meat of its flight envelope. The Mustang overshot and pulled up into a loop to transfer its kinetic energy into potential energy and set itself up for another guns run against me. I went into a shallow high yo-yo just to get some air under my feet and stay out of plane with the Mustang, trying to force him into a deflection shot of some sort. He came over the top and back down on me as I tightened my turn and worked my throttle to avoid nose-planting on the side of the valley. He tried to drop flaps in order to lose speed but it was no use. On the pull-out he scraped his prop on the grassy knoll and had to ditch. Victory through superior energy management, again.
My advice when flying the 190A8 is this: in a low-speed fight, Mustangs will have the advantage. In a high-speed fight, the fight becomes more equal. The key fact is that the 190 can lose its speed, and therefore cut a turn shorter, than a Mustang when both planes start out fast - 400 knots or so. You have to use a Mustang's energy retention against it.
For other planes, the best attack is the one from dead astern or dead ahead. In the 190A8 with four 20mms, go for the HO if the enemy will give it to you. You can also try for a snap shot if the enemy is maneuvering. However, don't try to turn fight unless you are 1 v 1 or have the odds in your favor.