Try running WEP, 90% throttle, and radiators fully closed. And then TRIM your plane to fly straight and level (check your slip/slide ball). If you can't get at least 600 km/h (370 mph), you are doing something wrong. Also, the plane can run for quite awhile like this without over-heating; and even when it does overheat, you can run for quite awhile without damaging your engine. If you need the extra punch, give it more throttle, but it will overheat quickly if you do so.
I've managed to outrun Dora's on the deck with these settings. I don't think the tempest is faster than the 190's but if I'm not losing E due to radiators, improper trim, and overuse of the controls, it makes a huge difference.
If you think of the plane as an allied equivalent of a 190 instead of as a 109 or spitfire, you will probably be more impressed with the plane.
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