I think this is only an estimation. It happens to J-10B. Before its induction, there are lots of discussion on Chinese forum that if the power from AL-31FN will be enough for an AESA radar, as all of the known fighters which are upgraded with AESA radar has used a more powerful variant engine, while the final result is consistent with some guys' thought: the new J-10B has Al-31FN Series 3, which has 1000 kgf more power than Al-31FN, though there is a possibility that this is not a cause and effect relation.Who says that? or the proof of it ?
However in this forum, I have never seen any discussion about this, and maybe because JF-17 has left enough power for upgrade?
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