Sparks,
That blackout calculation is happening on your FE, and would not have anything to do with the server.
The blackout limit is the same for everybody. Generally the difference you are seeing is simply speed. If you are even a bit faster than the other guy, he be able to turn tighter. This can be VERY hard to judge, especially with the effects of net lag and such that we deal with in an online flight sim. Add to that the fact that your theory is only true if the two of you are folliwing the EXACT same flight path, and you can see where the differences are.
Also, as the rest of this thread indicates, during the early parts of blackout, you still have control of the plane in AH. Some pilots will pull hard and endure a few seconds of blackout to get out of your sights. They will lose energy by turning tighter, and they will lose sight of you for a few seconds, so it is a trade off. It's a trade off you would make in real life too if there was a guy shooting at you.

Generally however, here is what I do in this situation. I stop pulling lead, and drop into lag pursuit. This allows me to stay out of blackout, avoid overshooting the other guy, and conserver my energy more than he is. The more G's you pull the more energy you lose to induced drag, so by pulling less, I gain an energy advantage on him. Now I am sitting on his six in lag pursuit with more energy... the perfect position. Once he is done yanking his guts out on the control stick and eases off a bit due to G-loc or rapidly dropping speed, I'll just pull lead and watch 8 x .50 Cal turn his airplane into chaff.

------------------
Lephturn - Chief Trainer
A member of The Flying Pigs
http://www.flyingpigs.com "A pig is a jolly companion, Boar, sow, barrow, or gilt --
A pig is a pal, who'll boost your morale, Though mountains may topple and tilt.
When they've blackballed, bamboozled, and burned you, When they've turned on you, Tory and Whig,
Though you may be thrown over by Tabby and Rover, You'll never go wrong with a pig, a pig,
You'll never go wrong with a pig!" -- Thomas Pynchon, "Gravity's Rainbow"